117. Convert Integer to String

#include <stdio.h>

char charnum[10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};

void print_integer_as_string(int num) {
    char digit[10] = {0};
    int idx = 0;
    if (!num) {
        printf("0");
        return;
    }
    if (num < 0) {
        printf("- ");
        num *= -1;
    }
    while (num) {
        digit[idx++] = charnum[num % 10];
        num /= 10;
    }
    do {
        printf("%c ", digit[--idx]);
    } while (idx);
}

int main() {
    int num;
    scanf("%d", &num);
    print_integer_as_string(num);
    return 0;
}