c - 用C语言查找 'e'的近似值

Question

我正在尝试使用C程序查找'e'的近似值。我正进入(状态
不管我输入n的值是什么，e的值都是真实的。请让我
在我的代码中找到错误。

#include <stdio.h>

int f;
int k;

int factorial (int f);

int main () { 
    int n,i;

    int e = 1;

    printf("Enter the value of n:");
    scanf("%d",&n);

    for (i = 1; i <= n; i++) {
        e = e + (1/factorial(i));
    }

    printf("The value of e is %d",e);

    return(0);
}

int factorial (int f) {    
    for (k = 1; k <= f; k++) {
       f = f*k;
    }

    return(p);
}

Answer 1

您有一些错误。您正在int变量中添加浮点值!请阅读以下代码的注释:

int k; // remove f

int factorial (int f);

int main () {

int n,i;

float e=1; // take e as float/double, not int

printf("Enter the value of n:");

scanf("%d",&n);

for (i=1 ; i<=n ; i++) {

    e=e+(1.0/factorial(i)); // take 1.0 (floating value) instead of 1 (integer value)
}

printf("The value of e is %f",e);

return(0);
}

int factorial (int f) {
    int total=1; // initialize total with 1
    for (k=1 ; k<=f ; k++) {

        total=total*k; // here is a big mistake in your code. You incremented value of f in every iteration. Try to print value of f after every iteration to find your error.
    }

    return(total);
}