求1×2×3×4…×n

Question

 

Answer 1

long sum = 1;  -- 要初始化为1

scanf("%d",&n);  ---n得取地址

while(i<=n) ---不然i等于n时就退出了，就不会乘到n

#include <stdio.h>
main()
{
	int n,i=1;
	long sum=1;
	scanf("%d",&n);
    printf("\n");
    while(i<=n){
        sum=sum*i;
        i++;
    }
    printf("sum=%ld",sum);
	return 0;
}