Write a C program to concatenate two string together without using library function

In this article we will learn how write C program to concatenate two string together without using library function.

Answer:

1. #include<stdio.h>
2. #include<string.h>
3. void concat(char[], char[]);
4. int main() {
5. char s1[50], s2[30];
6. printf("\nEnter String 1 :");
7. gets(s1);
8. printf("\nEnter String 2 :");
9. gets(s2);
10. concat(s1, s2);
11. printf("\nConcated string is :%s", s1);
12. return (0);
13. }
14. void concat(char s1[], char s2[]) {
15. int i, j;
16. i = strlen(s1);
17. for (j = 0; s2[j] != '\0'; i++, j++) {
18. s1[i] = s2[j];
19. }
20. s1[i] = '\0';
21. }