Question

我在C语言中有一段代码，应该用来计算周长。无论我在输入变量Z时输入什么，它始终会显示0.000000

有什么想法吗？

#include <stdio.h>
int main()
{
    double pi = 3.1415926;
    double z = 0.0;
    printf("What is the radius of the circle? \n ");
    scanf("%1f", &z);
    double c =  2.0 * pi * z;
    printf("The circumference is %1f", c);
    return 0;
}

Answer 1

将%1f更改为%lf。

像这样：

#include <stdio.h>
int main()
{
    double pi = 3.1415926;
    double z = 0.0;
    printf("What is the radius of the circle? \n ");
    scanf("%lf", &z);
    double c =  2.0 * pi * z;
    printf("The circumference is %lf", c);
    return 0;
}

Answer 2

要读成z的两倍，您必须使用scanf("%lf", &z)而不是"%1f"。

Answer 3

您非常亲密。试试这个

#include <stdio.h>
int main()
{
    double pi = 3.1415926;
    double z = 0.0;
    printf("What is the radius of the circle? \n ");
    scanf("%1f", &z);
    double c =  2.0 * pi * z;
    printf("The circumference is %.1f", c);
    return 0;
}

您的逻辑告诉浮点数，它需要一个整数，但此后不需要小数点

printf打印双精度时打印零

3 个答案: