利用求阶乘函数Fact(),编程计算并输出1!+2!+……+n!的值
时间: 2023-11-24 10:51:24 浏览: 231
以下是利用求阶乘函数Fact(),编程计算并输出1!+2!+……+n!的值的C语言代码:
```c
#include <stdio.h>
int Fact(int n) {
if (n == 0 || n == 1) {
return 1;
} else {
return n * Fact(n - 1);
}
}
int main() {
int n, sum = 0;
printf("请输入一个正整数n:");
scanf("%d", &n);
for (int i = 1; i <= n; i++) {
sum += Fact(i);
}
printf("1!+2!+...+%d!的值为:%d\n", n, sum);
return 0;
}
```
运行结果如下:
```
请输入一个正整数n:5
1!+2!+...+5!的值为:153
```
相关问题
C语言,利用求阶乘函数fact,编程计算并输出1!+2!+...+n!的值
以下是C语言实现计算1!+2!+3!+……+n!的代码,其中利用了求阶乘函数fact(n):
```c
#include <stdio.h>
double fact(int n) {
double res = 1;
for (int i = 1; i <= n; i++) {
res *= i;
}
return res;
}
double fun(int n) {
double res = 0;
for (int i = 1; i <= n; i++) {
res += fact(i);
}
return res;
}
int main() {
int n;
printf("Enter n: ");
scanf("%d", &n);
printf("%.0f\n", fun(n));
return 0;
}
```
帮我编写C语言,利用求阶乘函数fact(),编程计算并输出1!+2!+……+n!的值
在C语言中,我们可以创建一个`factorial()`函数来计算阶乘,然后使用循环来累加从1到n的所有整数的阶乘。下面是一个简单的示例程序:
```c
#include <stdio.h>
// 求阶乘的函数
unsigned long long factorial(int n) {
unsigned long long fact = 1;
for (int i = 1; i <= n; i++) {
fact *= i;
}
return fact;
}
// 计算并输出1! + 2! + ... + n!
int main() {
int n;
printf("Enter a positive integer: ");
scanf("%d", &n);
unsigned long long sum_of_fact = 0;
for (int i = 1; i <= n; i++) {
sum_of_fact += factorial(i);
}
printf("The sum of factorials from 1! to %d! is: %llu\n", n, sum_of_fact);
return 0;
}
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