源程序如下：

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

int main()
{
    int data, dataBuf;
    int s = 1;
    int i = 2;
    char c;

    printf("Please input an integer:");
    scanf("%d", &data);
    if  (data < 3)
    {
        return 0;
    }
    dataBuf = data;
    printf("%d = ", data);
    while (s < dataBuf)
    {
          if  ((data % i) == 0)
          {
              data /= i;
              s *= i;
              if  (s == dataBuf)
              {
                  printf("%d", i);/* if it is the last one */
              }
              else
              {
                  printf("%d*", i);/* if it is not the last one with a * follow it */
              }
          }
          else
          {
              i++;
          }
    }
    printf("\n");
    c = getchar();