117. Convert Integer to String

#include <stdio.h>

void print_integer_as_string(int num) {
    char result[21]="00000000000000000000";
    if(num==0) {
        putchar('0');
        return;
        }
    int tmp=num;
    unsigned int idx = 19;
    if(tmp<0) tmp*=-1;
    while(tmp){
        result[idx]='0'+(tmp%10);
        tmp/=10;
        idx--;
    }
    if(num<0) result[idx] = '-',idx--;
    for(int j=idx+1;result[j]!='\0';j++){
        putchar(result[j]);
        putchar(' ');
    }
}

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