C++编程。。长见识篇

1034: 求值Time Limit: 1 Sec  Memory Limit: 128 MB

Submit: 191  Solved: 14
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Description

求Sn=1!+2!+3!+4!+5!+…+n!之值，其中n是一个数字。

Input

n

Output

和

Sample Input

5

Sample Output

153

#include <iostream>#include <stdio.h>using namespace std;long long int sum;long long int item;int main(){    long long int n;    scanf("%lld",&n);    long long int i;        sum = 0;        item = 1;        for(i = 1; i <= n; i ++)        {            item *= i;            sum = sum + item;        }        printf("%lld\n",sum);    return 0;}

类型名称        字节数    取值范围
signed char       1        -128～+127
short int         2        -32768～+32767
int               4        -2147438648～+2147438647

long int          4        -2147438648～+2141438647

long long int  8      -9223372036854775808～+9223372036854775807

长见识了。。