#include<stdio.h>
#define Max_size 100
int main(){
    int i=0,j=0;
    char t1[Max_size]="C program to concatenate";
    char t2[Max_size]="two strings";
    for(i=0;t1[i]!='\0';i++){
         
    
}
 j = 0;
    while(t2[j] != '\0')
    {
        t1[i] = t2[j];
        i++;
        j++;
    }
    printf("%s\n",t1);
}