c - 使用 float 变量和 scanf() 获取用户成绩并 printf() 进行调试断言失败

Question

#include <stdio.h>
#include <stdlib.h>

int main()
{
    float grade1 = 0.0;
    float grade2 = 0.0;
    float grade3 = 0.0;

    printf("Enter your three test grades in decimal form: \n");

    scanf(" %f", grade1);
    scanf(" %f", grade2);
    scanf(" %f", grade3);

    float avg = (grade1 + grade2 + grade3) / 3;
    printf("Average: %.2f \n", avg);

    system("pause");
    return 0;
}

我正在新的波士顿 YT channel 上使用教程，此代码在我的编译器上不起作用，而教程代码却可以工作。我有 Visual Studio Community 2015。

Answer 1

引导代码不能相同，否则不起作用。我建议您在编译器中启用警告，这将使您将来避免犯一些微不足道的错误。

所以，错误在这里:

scanf(" %f", grade1);
scanf(" %f", grade2);
scanf(" %f", grade3);

这三个变量需要&运算符来接收值。

scanf(" %f", &grade1);
scanf(" %f", &grade2);
scanf(" %f", &grade3);

我建议您看看:https://www.tutorialspoint.com/cprogramming/c_operators.htm