Convert Integer to String

#include <stdio.h>

void print_integer_as_string(int num) {
    int buffer[30];
    int sign = 1; // 0 = negative, 1 = positive
    if(num > 0){
        sign = 1;
    }else if(num < 0){
        sign = 0;
    }else{
        printf("%d",0);
        return;
    }

    int i=0;
    while(num != 0){
        if(num < 0){
            num = -num;
        }
        buffer[i] = num % 10;
        num /= 10;
        i++;
    }
    if(sign == 0){
        printf("- ");
    }
    for(int j=i-1; j>=0 ;j--){
        printf("%d ", buffer[j]);
    }
}

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