{"post":"

Here, We will write a program in C to swap two strings using two different approaches.

Approach 1: Using inbuilt string functions:

This is the easiest technique to implement the above problem statement.
We use the inbuilt function strcpy from h header file and swap the text of both strings with the help of a temporarily provisioned array pointer – temp.

Code:

#include<stdio.h>\n#include<string.h>\n#include<malloc.h>\n#include<conio.h>\nint main()\n{\nchar str1[50], str2[50], *temp;
\nprintf(\"Enter string 1: \");\nfgets(str1, 50, stdin);\nprintf(\"\\nEnter string 2: \");\nfgets(str2, 50, stdin);
\nprintf(\"\\nBefore Swapping\\n\");\nprintf(\"First string: %s\\n\",str1);\nprintf(\"Second string: %s\\n\",str2);
\ntemp = (char*)malloc(100);\nstrcpy(temp,str1);        //swapping values using a temp string pointer.\nstrcpy(str1,str2);\nstrcpy(str2,temp);\nprintf(\"After Swapping\\n\");\nprintf(\"First string: %s\\n\",str1);\nprintf(\"Second string: %s\\n\",str2);
\nfree(temp);
\ngetch();\nreturn 0;
\n}

Output:

Enter string 1: Mindblowing!\nEnter string 2: Fantastic!\nBefore Swapping\nFirst string: Mindblowing!\nSecond string: Fantastic! \nAfter Swapping \n

First string: Fantastic!\nSecond string: Mindblowing!

Approach 2: Without using string functions:

We will use a temp array here which will hold the characters of the first array on a temporary basis while swapping.
str1's character is held in temp's ith position, we save str2's character into str1's ith position.
The character at ith position of str2 is replaced by ith character of temp which holds original data of str1.
We continue with the process until the largest string's null character is encountered.

Code:

#include <stdio.h>\nint main()\n{\nchar temp[100], *str1, *str2;\nint i, size = 100;
\nprintf(\"Enter the first string: \");\nstr1 = (char*)malloc(size);\ngetline(&str1, &size, stdin);
\nprintf(\"\\nEnter the second string: \");\nstr2 = (char*)malloc(size);\ngetline(&str2, &size, stdin);
\nfor(i=0; str1[i]!='\\0'|| str2[i]!='\\0'; i++)\n{\ntemp[i] = str1[i];\nstr1[i] = str2[i];\nstr2[i] = temp[i];\n}
\nprintf(\"\\n\\nThe strings after swapping:\\n\\n\");\nprintf(\"First string:  %s \\n\", str1);\nprintf(\"First string:  %s  \\n\", str2);\nreturn 0;
\n}

Output:

Enter the first string: How are you doing ?\nEnter the second string: I am doing good !\n

The strings after swapping:\nFirst string: I am doing good !\nSecond string: How are you doing ?

\n","title":"Program to Swap two Strings in C","authorDetails":{"name":"Pooja Rao","slug":"pooja-rao"},"description":"C program to swap two strings using diffrent approaches learn more examples in C programming language...","slug":"c-programming-language/examples/c-program-to-swap-two-strings/","articleId":"636a834b7bb1ce5072622c9e","bookmarkStatus":{"isBookmarked":false,"bookmarkId":null}}