/*
 * File: ncopies.c
 * ---------------
 * building a string consisting of n copies of a given string
 */

#include <stdio.h>
#include <string.h>

#define MaxStrIn 20
#define MaxStrOut 200

main()
{
    char strIn[MaxStrIn], strOut[MaxStrOut], space_ans[4];
    int i, n, space_opt;

    printf("Input string: ");
    scanf("%s", strIn);
    printf("How many copies? ");
    scanf("%d", &n);
    printf("Space in between [yes/no]? ");
    scanf("%s", space_ans);

    if (!strcmp(space_ans, "yes") || !strcmp(space_ans, "Yes")) 
    {
        space_opt = 1;
    }
    else 
    {
        space_opt = 0;
    }

    if ( n * strlen(strIn) >= MaxStrOut )
    {
        printf("Warning: Output string too long. Exit."); 
        exit(-1);
    }

    strOut[0] = '\0';
    for (i = 0; i < n; i++) {
         strcat(strOut, strIn);
         if (space_opt) strcat(strOut, " ");
    }
    printf("Output string below:\n%s\n", strOut); 
}