这个程序运用上函数怎么编写？

Question

Answer 1

#include <stdio.h>

void print_factor(int x){
    for(int i=2;i*i<=x;i++){
        if(x%i==0){
            printf(",%d",i);
            print_factor(x/i);
            return;
        }
    }
    printf(",%d",x);
}
int main()
{
    int m;
    scanf("%d",&m);
    int flag = 1;
    for(int i=2;i*i<=m;i++){
        if(m%i==0){
            flag = 0;
            printf("%d",i);
            print_factor(m/i);
            break;
        }
    }
    if(flag){
        printf("It is a prime number");
    }
    return 1;
}