printf 在打印双精度数时打印零 [英] printf printing zero when printing a double

问题描述

我有一段 C 代码，用于计算周长.无论我在变量 Z 中输入什么，它总是打印 0.000000

I have a piece of code in C, which is supposed to compute the circumference. No matter what I put in for variable Z when asked for it, it always prints 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;
}

推荐答案

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;
}

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