Question

c语言编程：用递归与非递归求n！

Answer 1

由于长整型数据有限制 这个阶层算不了多大的 测试的时候就用一位数吧
如果不能用再追问我吧

①递归
#include "stdio.h"
#include "conio.h"

main()
{
int input;
long result;
long f(int n);
scanf("%d",&input);

result = f(input);
printf("%d! = %ld",input,result);
}

long f(int n)
{
if(n<0){
printf("函数输入无效！");
return;
}
if(n==0)
{
return (long)1;
}
if(n>0)
{
return (long)n*f(n-1);
}
}
②非递归
#include "stdio.h"
#include "conio.h"

main()
{
int input,i;
long result = 1;
do{
printf("Please input an integer that is bigger than 0!\n");
scanf("%d",&input);
}while(input<0);

for(i=input;i>1;i--)
{
result = result*i;
}

printf("%d! = %ld",input,result);
}