RUN


Here is a list of most asked Pattern programs in C++.

Pattern

  
    *
   ***
  *****
 *******
*********
View Code


	
#include 
using namespace std;

	int main()
	{
		int n;
		cout << "Enter number of rows to be printed\n"; cin >> n;
		for (int i = 1; i <= n; ++i)	//for each row
		{
			for (int j = 0; j < n - i; ++j)	//for printing spaces
				cout << " ";
			for (int j = 0; j < 2 *i - 1; ++j)	//for printing star
				cout << "*";
			cout << "\n";	//going to new line after completing one row
		}
		return 0;
	}

Pattern

  
      *
     * *
    * * *
   * * * *

View Code


	
	
#include 
using namespace std;

	int main()
	{
	  int n;
	  cout << "Enter number of rows to be printed\n"; cin >> n;
	  for (int i = 1; i <= n; ++i)	//for each row
	  {
	    for (int j = 0; j < n - i; ++j)	//for printing spaces
	      cout << " ";
	    for (int j = 1; j <= i; ++j)	//for printing star and space
	      cout << "*";
	    cout << "\n";	//going to new line after completing one row

	  }
	  return 0;
	}

Pattern

  
   1
  121
 12321
View Code


#include 
using namespace std;

int main()
{
  int n;
  cout << "Enter number of rows to be printed\n"; cin >> n;
  for (int i = 1; i <= n; ++i)	//for each row
  {
    for (int j = 0; j < n - i; ++j)	//for printing spaces
      cout << " ";
    for (int j = 1; j <= i; ++j)	//for increasing series
      cout << j; for (int j = i - 1; j > 0; --j)
      cout << j;
    cout << "\n";	//going to new line after completing one row

  }
  return 0;
}


Pattern

  
    * 1 *
  * 1 2 1 *
* 1 2 3 2 1 *
View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//for each row
	{
		cout << "*";	//beginning star
		for (int j = 1; j <= i; ++j)	//for increasing series
			cout << j << " "; for (int j = i - 1; j > 0; --j)	//for decreasing series
			cout << j << " ";
		cout << "*";	//ending star
		cout << "\n";	//going to new line after completing one row

	}
	return 0;
}


Pattern

  
1
2 3
4 5 6
7 8 9 10

View Code


	
#include 
#include   	//for setw function
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	int num = 1;	//maintains the number to be printed
	for (int i = 1; i <= n; ++i)	//for row
	{
		for (int j = 0; j < i; ++j)	//printing num and incrementing it ‘i’ times 
			cout << setw(3) << num++ << " ";	//setw is used to prevent disruption due to different number
		//of digits
		cout << "\n";	//going to next line to print next row
	}

	return 0;
}


Pattern

  
   A
  ABC
 ABCDE
ABCDEFG

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//for each row
	{
		for (int j = 0; j < n - i; ++j)	//for printing spaces
			cout << " ";
		for (int j = 1; j <= 2 *i - 1; ++j)	//for printing alphabets
			cout << (char)('A' + j - 1);
		cout << "\n";	//going to new line after completing one row

	}
	return 0;
}


Pattern

  
   A
  ABA
 ABCBA
ABCDCBA

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//for each row
	{
		for (int j = 0; j < n - i; ++j)	//for printing spaces
			cout << " ";
		for (int j = 0; j < i; ++j)	//for increasing Alphabets
			cout << (char)('A' + j); for (int j = i - 1; j > 0; --j)	//for decreasing Alphabets
			cout << (char)('A' + j - 1);;
		cout << "\n";	//going to new line after completing one row

	}
	return 0;
}


Pattern

  
     A1
    AB12
   ABC123
  ABCD1234

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//for each row
	{
		for (int j = 0; j < n - i; ++j)	//for printing spaces
			cout << " ";
		for (int j = 1; j <= i; ++j)	//for printing alphabets
			cout << (char)('A' + j - 1);
		for (int j = 1; j <= i; ++j)	//for printing numbers
			cout << j;
		cout << "\n";	//going to new line after completing one row

	}
	return 0;
}

30+ C Programming Interview Questions

Pattern

  
*****1*****
****2*2****
***3*3*3***
**4*4*4*4**
*5*5*5*5*5*
6*6*6*6*6*6

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//for row
	{
		int num = i;
		for (int j = 0; j < n - i; ++j)	//printing preceding stars
			cout << "*";
		while (--num)	//printing the numbers with stars
			cout << i << "*";
		cout << i;	//printing the number last time without star
		for (int j = 0; j < n - i; ++j)	//printing following stars
			cout << "*";
		cout << "\n";	//going to next line to print next row
	}

	return 0;
}


Pattern

  
    *
   * *
  *   *
 * * * *

View Code


	
#include 
using namespace std;

	int main()
	{
		int n;
		cout << "Enter number of rows to be printed\n"; cin >> n;
		for (int i = 0; i < n - 1; ++i)	//for row till second-last
		{
			int j;
			for (j = 1; j <= n + i; ++j)	//moving cursor from first to last place of line
			{
				if (j == n - i || j == n + i)	//printing star as required
					cout << "*";
				else	//printing space
					cout << " ";
			}
			cout << "\n";	//going to new line after completing one row
		}
		for (int j = 0; j < n; ++j)	//printing last row
			cout << "*";
		return 0;
	}


Pattern

  
* * * * * * *
*           *
*           *
* * * * * * *

View Code


#include 
using namespace std;

int main()
{
	int l, b;
	cout << "Enter length and breadth seperated by space\n"; cin >> l >> b;
	for (int i = 0; i < b; ++i)	//for row
	{
		if (i == 0 || i == b - 1)	//printing first and last row
		{
			for (int j = 0; j < l; ++j)
				cout << "*";
		}
		else
		{
			for (int j = 0; j < 2 * l; ++j)	//printing other rows
			{
				if (j == 0 || j == 2 *l - 2)	//printing first and last star
					cout << "*";
				else	//printing spaces
					cout << " ";
			}
		}
		cout << "\n";
	}
	return 0;
}


Pattern

  
* * * * *
    * * * *
        * * *
            * *
                *

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 0; i < n; ++i)	//for row
	{
		for (int j = 0; j < 4 * i; ++j)
			cout << " ";	//printing beginning spaces
		for (int j = 0; j < n - i; ++j)
			cout << "*";	//printing stars
		cout << "\n";	//going to next line to print next row
	}
	return 0;
}


Pattern

  
* * * * *
* * * *
* * *
* *
*

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 0; i < n; ++i)	//for row
	{
		for (int j = 0; j < n - i; ++j)
			cout << "*";	//printing stars
		cout << "\n";	//going to next line to print next row
	}
	return 0;
}


Pattern

  
        *
      * *
    * * *
  * * * *
* * * * *
  * * * *
    * * *
      * *
        * 

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter height of triangle\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//printing upper half of triangle
	{
		for (int j = 0; j < (2 *(n - i)); ++j)
			cout << " ";	//printing spaces
		for (int j = 0; j < i; ++j)
			cout << "*";	//printing spaces
		cout << "\n"; //going to next line to print next row } for (int i = n - 1; i > 0; --i)	//printing lower half
	{
		for (int j = 0; j < (2 *(n - i)); ++j)
			cout << " ";	//printing spaces
		for (int j = 0; j < i; ++j)
			cout << "*";	//printing spaces
		cout << "\n";	//going to next line to print next row
	}
	return 0;
}


Pattern

  
* * * * *  * * * * *
* * * *      * * * *
* * *          * * *
* *              * *
*                  *
*                  *
* *              * *
* * *          * * *
* * * *      * * * *
* * * * *  * * * * *

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter height of one half\n"; cin >> n;
	for (int i = n; i > 0; --i)	//print upper half
	{
		for (int j = 1; j <= 2 * n; ++j)
		{
			if (j <= i)	//print stars in left half
				cout << "*";
			else	//print space after star in right half
				cout << " ";
			if (i <= ((2 *n) - j))	//print space after star in left half
				cout << " ";
			else	//print stars in right half
				cout << "*";
		}
		cout << "\n";
	}
	for (int i = 1; i <= n; ++i)	//print lower half
	{
		for (int j = 1; j <= 2 * n; ++j)
		{
			if (j <= i)	//print stars in left half
				cout << "*";
			else	//print space after star in right half
				cout << " ";
			if (i <= ((2 *n) - j))	//print space after star in left half
				cout << " ";
			else	//print stars in right half
				cout << "*";
		}
		cout << "\n";
	}
	return 0;
}

30+ C Programming Interview Questions

Pattern

  
*                  *
* *              * *
* * *          * * *
* * * *      * * * *
* * * * *  * * * * *
* * * * *  * * * * *
* * * *      * * * *
* * *          * * *
* *              * *
*                  *

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter half of height of butterfly\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//print upper half
	{
		for (int j = 1; j <= 2 * n; ++j)
		{
			if (j <= i)	//print stars in left half
				cout << "*";
			else	//print space after star in right half
				cout << " ";
			if (i <= ((2 *n) - j))	//print space after star in left half
				cout << " ";
			else	//print stars in right half
				cout << "*";
		}
		cout << "\n"; } for (int i = n; i > 0; --i)	//print lower half
	{
		for (int j = 1; j <= 2 * n; ++j)
		{
			if (j <= i)	//print stars in left half
				cout << "*";
			else	//print space after star in right half
				cout << " ";
			if (i <= ((2 *n) - j))	//print space after star in left half
				cout << " ";
			else	//print stars in right half
				cout << "*";
		}
		cout << "\n";
	}
	return 0;
}


Pattern

  
        *
       * *
      * * *
     * * * *
    * * * * *
    * * * * *
     * * * *
      * * *
       * *
        *
View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter width of diamond\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//print upper half 
	{
		for (int j = 0; j < n - i; ++j)	//print spaces
			cout << " ";
		for (int j = 0; j < i; ++j)	//print stars
			cout << "*";
		cout << "\n"; } for (int i = n - 1; i > 0; --i)	//print lower half
	{
		for (int j = 0; j < n - i; ++j)	//print spaces
			cout << " ";
		for (int j = 0; j < i; ++j)	//print stars
			cout << "*";
		cout << "\n";
	}
	return 0;
}


Pattern

  
         *
       *   * 
     *       *  
   *           *  
  *             *
   *           *
     *        *  
        *   * 
          *

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter width of diamond\n"; cin >> n;
	for (int i = 0; i < n; ++i)	//print upper half
	{
		for (int j = 1; j <= 2 * n; ++j)
		{
			if (j == n - i || j == n + i)	//print corresponding stars
				cout << "*";
			else	//printing rest spaces
				cout << " ";
		}
		cout << "\n"; } for (int i = n - 2; i >= 0; --i)	//print lower half
	{
		for (int j = 1; j <= 2 * n; ++j)
		{
			if (j == n - i || j == n + i)	//print corresponding stars
				cout << "*";
			else	//printing rest spaces
				cout << " ";
		}
		cout << "\n";
	}
	return 0;
}


Pattern

  
3
44
555
6666
555
44
3

View Code


#include 
using namespace std;

int main()
{
	int n, num;
	cout << "Enter number to start with\n"; cin >> num;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//print upper half
	{
		for (int j = 1; j <= i; ++j)	//print number 
		{ 
			cout << num;
		}
		++num;	//increasing for next row
		cout << "\n"; } --num; //bringing back the last printed value for (int i = n - 1; i > 0; --i)	//print lower half
	{
		--num;	//decreasing the number to print
		for (int j = 1; j <= i; ++j)
		{
			cout << num;	//printing the number
		}
		cout << "\n";
	}
	return 0;

}


Pattern

  
1
2*3
4*5*6
7*8*9*10
7*8*9*10
4*5*6
2*3
1

View Code


	
#include 
using namespace std;
int main()
{
	int n;
	cout << "Enter number of rows of one half\n"; cin >> n;
	int num = 1;
	for (int i = 1; i <= n; ++i)	//print upper half
	{
		for (int j = 1; j <= 2 *i - 1; ++j)
		{
			if (j % 2 != 0)	//print number at odd places
				cout << num++;	//increasing for next place
			else	//print star at odd places
				cout << "*";
		}
		cout << "\n"; } --num; //bringing back the last printed value num = num - (n - 1); //setting num to be printed at the beginning number for (int i = n; i > 0; --i)	//print lower half
	{
		for (int j = 1; j <= 2 *i - 1; ++j)
		{
			if (j % 2 != 0)	//print number at odd places
				cout << num++;	//increasing for next place
			else	//print star at odd places
				cout << "*";
		}
		cout << "\n";
		num = num - (i - 1);
	}
	return 0;

}


Pattern

  
*
 **
  ***
   ****
    *****
   ****
  ***
 **
*

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter half of number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//upper half
	{
		for (int j = 1; j < i; ++j)	//prints spaces
			cout << " ";
		for (int j = 1; j <= i; ++j)	//prints stars
			cout << "*";
		cout << "\n"; //going to new line after completing one row } for (int i = n - 1; i > 0; --i)	//lower half
	{
		for (int j = 1; j < i; ++j)	//prints spaces
			cout << " ";
		for (int j = 1; j <= i; ++j)	//prints stars
			cout << "*";
		cout << "\n";	//going to new line after completing one row
	}
	return 0;
}


Pattern

  
    *
      *
        *
   *******
        *
      *
    *

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	n = n / 2;
	for (int i = 1; i <= n; ++i)	//upper half
	{
		for (int j = 0; j < n - 1 + i; ++j)	//prints spaces
			cout << " ";
		cout << "*";	//prints star
		cout << "\n";	//going to new line after completing one row
	}
	for (int j = 0; j < 2 *n + 1; ++j)	//middle line
		cout << "*";
	cout << "\n"; for (int i = n; i > 0; --i)	//lower half
	{
		for (int j = 0; j < n - 1 + i; ++j)	//prints spaces
			cout << " ";
		cout << "*";	//prints star
		cout << "\n";	//going to new line after completing one row
	}
	return 0;
}


Pattern

  
0
1 0
0 1 0

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows to be printed\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//row number
	{
		for (int j = 1; j <= i; ++j)	//position in each row
		{
			if ((i + j) % 2 == 0)	//divisibility of sum decides one or two
				cout << "0 ";
			else
				cout << "1 ";
		}
		cout << "\n";
	}
	return 0;
}


Pattern

  
  *****
 *****
*****

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter length of rhombus\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//row number
	{
		for (int j = 1; j <= n - i; ++j)	//printing spaces
			cout << " ";
		for (int j = 1; j <= n; ++j)	//printing the side
			cout << "*";
		cout << "\n";
	}
	return 0;
}


Pattern

  
    ***
  * *
***

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter length of rhombus\n"; cin >> n;
	for (int i = 1; i <= n; ++i)	//row number
	{
		for (int j = 1; j <= n - i; ++j)	//printing spaces
			cout << " ";
		if (i == 1 || i == n)
		{
			for (int j = 1; j <= n; ++j)	//printing the upper and lower side
				cout << "*";
		}
		else
		{
			for (int j = 1; j <= n; ++j)
			{
				if (j == 1 || j == n)	//print first and last star of the side
					cout << "*";
				else
					cout << " ";
			}
		}
		cout << "\n";
	}
	return 0;
}


Pattern

  
N=2;		
 X		
X X
 X
N=5;
    X
     X
    O X
     O X
X O X O X
 X O
  X O
   X
    X
N=6;
    X
      X
     O X
      O X
     X O X
X O X X O X
 X O X
  X O
   X O
    X
     X

View Code


#include 
using namespace std;

void px(int n)	//print alternate X O beginning from X
{
	for (int i = 1; i <= n; ++i)
	{
		if (i % 2 != 0)
			cout << "X ";
		else
			cout << "O ";
	}
}

void po(int n)	//print alternate X O beginning from O
{
	for (int i = 1; i <= n; ++i)
	{
		if (i % 2 != 0)
			cout << "O ";
		else
			cout << "X ";
	}
}
int main()
{
	int n, m, i, spaces, val;
	cout << "Enter number of elements in middle row\n"; cin >> m;
	if (m % 2 == 0)	//n-2 lines in case of even
		n = m - 1;
	n = m - 1;	//just n-1 for odd
	spaces = m - 1;	//number of spaces
	for (int i = 1; i <= n / 2; ++i)	//print 2 rows together
	{
		val = i;	//number of values in row
		for (int j = 1; j <= spaces; j++)
			cout << " ";
		if (i % 2 != 0)
			px(val);
		else
			po(val);
		cout << "\n";
		//printing second row with one space more
		for (int j = 1; j <= spaces + 1; j++)
			cout << " ";
		if (i % 2 != 0)	//odd row number
			px(val);
		else
			po(val);
		cout << "\n";
	}
	if (m % 2 == 0)	//extra mid row for even m
	{
		i = m / 2;
		val = i;
		for (int j = 1; j <= spaces; j++)
			cout << " ";
		if (i % 2 != 0)
			px(val);
		else
			po(val);
		cout << "\n";
	}
	//printing middle row
	if (m % 2 != 0)
		px(m);
	else
	{
		val = m / 2;
		px(val);
		if (val % 2 == 0)	//printed half ended on o
			po(val);
		else	//printed half ended at x
			px(val);
	}
	cout << "\n";
	//printing lower half
	spaces = 1;
	if (m % 2 == 0)	//extra mid row for even m
	{
		i = m / 2;
		val = i;
		for (int j = 1; j <= spaces; j++)
			cout << " ";
		px(val);
		spaces++;	//incrementing spaces for next row
		cout << "\n"; } for (int i = n / 2; i > 0; --i)
	{
		val = i;	//number of values in row
		for (int j = 1; j <= spaces; j++)
			cout << " ";
		px(val);
		cout << "\n";
		spaces++;
		//printing second row with one space more
		for (int j = 1; j <= spaces; j++)
			cout << " ";
		px(val);
		cout << "\n";
		spaces++;
	}
	return 0;
}


Pattern

  
    * *
    * *
  * * * *
  * * * *
* * * * * *
* * * * * *

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of steps\n"; cin >> n;
	for (int i = 1; i <= n; ++i)
	{
		int spaces = 2 *(n - i);
		int ctr = 0;
		while (ctr < 2)	//print same row twice
		{
			for (int j = 1; j <= spaces; ++j)
				cout << " ";
			for (int j = 1; j <= 2 * i; ++j)
				cout << "*";
			ctr++;
			cout << "\n";
		}
	}
	return 0;
}


Pattern

  
       1
    2 1 1 2
 3 2 1   1 2 3
    2 1 1 2
       1

View Code


	
#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows\n"; cin >> n;
	int r = n / 2 + 1;
	for (int i = 1; i <= r; ++i)	//upper half
	{
		for (int j = 1; j <= 3 *(r - i); j++)	//beginning spaces
		{
			cout << " "; } for (int j = i; j > 0; --j)	//printing decreasing numbers
			cout << j << " "; for (int j = 2 *(i - 2); j > 0; --j)
			cout << " ";
		for (int j = 1; j <= i && i > 1; ++j)	//printing increasing numbers
			cout << j << " ";
		cout << "\n"; } for (int i = r - 1; i > 0; --i)	//lower half
	{
		for (int j = 1; j <= 3 *(r - i); j++)	//beginning spaces
		{
			cout << " "; } for (int j = i; j > 0; --j)	//printing decreasing numbers
			cout << j << " "; for (int j = 2 *(i - 2); j > 0; --j)
			cout << " ";
		for (int j = 1; j <= i && i > 1; ++j)	//printing increasing numbers
			cout << j << " ";
		cout << "\n";
	}
	return 0;
}


Pattern

  
*      * * * *
*      *
*      *
*  *  *  *  *
      *     *
      *     *
* * * *     *

View Code


#include 
using namespace std;
//all spaces in this program are two spaces
int main()
{
	int n;
	cout << "Enter number of rows\n"; cin >> n;
	for (int j = 1; j < 2 * n; ++j) //printing first line { if (j == 1 || j >= n)
			cout << "*";
		else
			cout << "  ";
	}
	cout << "\n";
	for (int i = 1; i <= n - 2; ++i)	//printing the upper half
	{
		for (int j = 1; j <= n; ++j)
		{
			if (j == 1 || j == n)
				cout << "*";
			else
				cout << "  ";
		}
		cout << "\n";
	}
	for (int j = 1; j < 2 * n; ++j)	//printing middle row
		cout << "*";
	cout << "\n";
	for (int i = 1; i <= n - 2; ++i)	//printing the lower half
	{
		for (int j = 1; j < 2 * n; ++j)
		{
			if (j == n || j == 2 *n - 1)
				cout << "*";
			else
				cout << "  ";
		}
		cout << "\n";
	}
	for (int j = 1; j < 2 * n; ++j)	//last row
	{
		if (j <= n || j == 2 *n - 1)
			cout << "*";
		else
			cout << "  ";
	}

	return 0;
}


Pattern

  
1        1
12      21
123    321
1234  4321
1234554321

View Code


#include 
using namespace std;

int main()
{
	int n;
	cout << "Enter number of rows\n"; cin >> n;
	for (int i = 1; i <= n; ++i)
	{
		for (int j = 1; j <= 2 * n; ++j)
		{
			if (j <= i)
				cout << j; else if (i > (2 *n - j))
				cout << 2 *n - j + 1;
			else
				cout << " ";
		}
		cout << "\n";
	}
	return 0;
}


Pattern

  
           1
        1   1
      1   2   1
    1   3   3   1
  1   4   6   4   1

View Code


#include 
#include   	//to use setw function
using namespace std;

int fact(int n)
{
	if (n <= 1)	//factorial of zero and 1
		return 1;
	else
		return (n* fact(n - 1));
}

int nCr(int n, int r)
{
	return (fact(n) / (fact(n - r) *fact(r)));
}

int main()
{
	int n;
	cout << "Enter number of rows\n"; cin >> n;
	for (int i = 0; i < n; ++i) { int spaces = (n - i - 1); while (spaces > 0)	//printing spaces
		{
			cout << setw(2) << " ";
			--spaces;
		}
		for (int j = 0; j <= i; ++j)	//printing terms
			cout << setw(3) << nCr(i, j) << " ";
		cout << "\n";
	}
	return 0;
}

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