{"post":"

Program in C to delete vowels from a string in c:

Vowels in English literature are the letters a,e,i,o,u. Remember that in a computer the characters are stored as ASCII values hence a and A both are different characters for the compiler. We would hence have to scan for both the lowercase and uppercase vowels if any in the string and delete it.

APPROACH 1: Using user-defined function:

While traversing the char array, we call the function find_vowel to return a flag i.e value 0 or 1 which would let us know if the

Code:

#include <stdio.h>\n#include <string.h>
\nint find_vowel(char ch)
\n{
\nif (ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' || ch == 'I' || ch =='o' || ch=='O' || ch == 'u' || ch == 'U')
\nreturn 1;   //It is a vowel
\nelse
\nreturn 0;   //It is not a vowel
\n}
\nint main()
\n{
\nchar str[100], temp[100];
\nint i, j;
\nprintf(\"Enter a string: \\n\");
\nfgets(str, 100, stdin);
\nfor(i = 0, j = 0; str[i] != '\\0'; i++)
\n{
\nif(find_vowel(str[i]) == 0)
\n{
\ntemp[j] = str[i];                           //It is not a vowel
\nj++;
\n}
\n}
\ntemp[j] = '\\0';  //terminate the string
\nstrcpy(str, temp);    //modifying the original string with vowels deleted.
\nprintf(\"String after deleting vowels: %s\\n\", str);
\nreturn 0;
\n}

Output:

Enter a string:\nHow are you? \n

String after deleting vowels: Hw r y?

APPROACH 2: Using pointers

Here the approach is the same as above, however, it is used in conjunction with pointers.

Code:

#include<stdio.h>\n#include<stdlib.h>
\n#include<string.h>
\nint find_vowel(char ch)
\n{
\nif (ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' || ch == 'I' || ch =='o' || ch=='O' || ch == 'u' || ch == 'U')
\nreturn 1;   //It is a vowel
\nelse
\nreturn 0;   //It is not a vowel
\n}
\nint main()
\n{
\nchar *string, *temp, *strptr, ch, *start;
\nint size = 100;
\nprintf(\"Enter a string\\n\");
\nstring = (char*)malloc(size);
\ngetline(&string, &size, stdin);
\ntemp = string;
\nstrptr = (char*)malloc(100);
\nstart = strptr;
\nwhile(*temp)
\n{
\nch = *temp;
\nif ( !find_vowel(ch) )
\n{
\n*strptr = ch;
\nstrptr++;
\n}
\ntemp++;
\n}
\n*strptr = '\\0';
\nstrptr = start;
\nstrcpy(string, strptr);
\nfree(strptr);
\nprintf(\"String after removing vowels: %s\\n\", string);
\nreturn 0;
\n}

Output:

Enter a string\nHow do you do ? \n

String after removing vowels: Hw d y d ?

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