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C : Concatenate Two Strings

Tutorial by:Manisha Dubey      Date: 2016-06-17 04:36:26

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You can concatenate two strings easily using standard library function strcat() but, this program concatenates two strings manually without using strcat() function.

Source Code to Concatenate Two Strings Manually

#include <stdio.h>
int main()
{
    char s1[100], s2[100], i, j;
    printf("Enter first string: ");
    scanf("%s",s1);
    printf("Enter second string: ");
    scanf("%s",s2);
    for(i=0; s1[i]!='\0'; ++i);  /* i contains length of string s1. */
    for(j=0; s2[j]!='\0'; ++j, ++i)
    {
        s1[i]=s2[j];
    }
    s1[i]='\0';
    printf("After concatenation: %s",s1);
    return 0;
}

Output

Enter first string: lol
Enter second string: :)
After concatenation: lol:)

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