8.8.cpp

c入门代码大全

/*用递归方法求n！*/
#include<stdio.h>
int main()
{
    float fac(int n);
    int n;
    float y;
    printf("input integer number:\n");
    scanf("%d",&n);
    y=fac(n);
    printf("%d!=%10.0f\n",n,y);
    getchar();
    getchar();
}

float fac(int n)
{
      float f;
      if(n<0)
        printf("n<0,dataerror");
      else
         if(n==0||n==1)
          f=1;
         else
          f=fac(n-1)*n;
         return(f);
}