分别用while语句、do-while语句、for语句编写程序,计算e≈1+1/1!+1/2!+...+1/n!

以下是三种不同语句实现计算e≈1+1/1!+1/2!+...+1/n!的程序：

1. while语句实现：

n = 20
sum = 0
i = 0
factorial = 1

while i <= n:
    if i == 0:
        factorial = 1
    else:
        factorial *= i
    sum += 1 / factorial
    i += 1

print("e ≈", sum)

2. do-while语句实现：

n = 20
sum = 0
i = 0
factorial = 1

while True:
    if i == 0:
        factorial = 1
    else:
        factorial *= i
    sum += 1 / factorial
    i += 1
    if i > n:
        break

print("e ≈", sum)

3. for语句实现：

n = 20
sum = 0
factorial = 1

for i in range(n+1):
    if i == 0:
        factorial = 1
    else:
        factorial *= i
    sum += 1 / factorial

print("e ≈", sum)

相关问题

分别用while语句、do-while语句、for语句编写程序， 计算e≈1+1/1!+1/2!+...+1/n!

以下是三种不同的方法来计算e≈1+1/1!+1/2!+...+1/n!：
1. 使用while循环来计算

n = int(input())
jie = 1
sum = 0
i = 1
while n >= i:
    jie = jie * i
    sum = sum + jie
    i = i + 1
print(sum)

2. 使用do-while循环来计算

public class Example1_3 {
    public static void main(String args[]) {
        double a = 1, b = 1, c = 0;
        System.out.println("do-while循环:");
        do {
            c = b + c;
            a++;
            b = (1.0 / a) * b;
        } while (a <= 20);
        System.out.println(" " + c);
        System.out.println("for循环:");
    }
}

3. 使用for循环来计算

public class Example1_3 {
    public static void main(String args[]) {
        double a, b, c;
        System.out.println("for循环:");
        for (c = 0, b = 1, a = 1; a <= 20; a++) {
            b *= (1.0 / a);
            c += b;
        }
        System.out.println(" " + c);
    }
}

分别用while语句、do-while语句、for语句编写程序，计算e≈1+1/1!+1/2!+...+1/n!

使用while语句计算e≈1+1/1!+1/2!+...+1/n!的代码如下所示：

int n = 20;
double sum = 1.0, number = 1.0;
int i = 1;
while (i <= n) {
    number /= i;
    sum += number;
    i++;
}
System.out.println("使用while循环计算的e≈" + sum);

使用do-while语句计算e≈1+1/1!+1/2!+...+1/n!的代码如下所示：

int n = 20;
double sum = 1.0, number = 1.0;
int i = 1;
do {
    number /= i;
    sum += number;
    i++;
} while (i <= n);
System.out.println("使用do-while循环计算的e≈" + sum);

使用for语句计算e≈1+1/1!+1/2!+...+1/n!的代码如下所示：

int n = 20;
double sum = 1.0, number = 1.0;
for (int i = 1; i <= n; i++) {
    number /= i;
    sum += number;
}
System.out.println("使用for循环计算的e≈" + sum);