Question

How to add N zeros to an empty string in C

Answer 1

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

char* addToEmptyStr(char* pad, size_t n) {
    char* str = calloc(n + 1, sizeof(char));

    while (strlen(str) < n) {
        strcat(str, pad);
    }

    return str;
}

int main() {
    int n = 4;

    char* empty_string = addToEmptyStr("0", n);

    printf("%s\n", empty_string);

    free(empty_string);

    return 0;
}





/*
run:

0000

*/

 

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