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C Program to Concatenate Two Strings

C Program to Concatenate Two Strings

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

#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);

    // calculate the length of string s1
    // and store it in i
    for(i = 0; s1[i] != '\0'; ++i);

    for(j = 0; s2[j] != '\0'; ++j, ++i)
        s1[i] = s2[j];

    s1[i] = '\0';
    printf("After concatenation: %s", s1);

    return 0;