参考：

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

void Positive_integer_disintegrant(int n)
{
    int i = 2, m;
    m = n;
    printf("%d = ", n);
    while (i <=(n/2)) {
        if (m%i == 0) {
            printf("%d", i);
            m = m / i;
            if (m != 1) {
                printf(" * ");
            }
        }
        if (m%i != 0) {
            i++;
        }
    }
}

int main(void)
{
    int n;
    printf("正整数分解质因数\n");
    scanf("%d", &n);
    Positive_integer_disintegrant(n);
    //system("pause");
    return 0;
}