Concatenate one string to another string - C String

Description

Concatenate one string to another string

Demo Code

#include <stdio.h>
/* concatenate t to end of s; s must be big enough */
void strcat(char s[], char t[]){
    int i, j;/*  w w w  .  j a  v  a  2  s . c  o  m*/

    i = j = 0;
    while (s[i] != '\0')    /* find end of s */
        i++;
    while ((s[i++] = t[j++]) != '\0')   /* copy t */
        ;
}

int main(){
    char buf[1000], urk[1000];
    int n = 0;

    while (fgets(buf, sizeof buf, stdin) != NULL) {
        sprintf(urk, "%d", ++n);
        strcat(urk, buf);
        printf("%s", urk);
    }
    return 0;
}

Result

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