c - *需要帮助解决我的程序* Visual Studio 调试错误

Question

输出带有调试错误，内容如下:

Runtime check failure #3 - The variable 'GPE2' is being used without being initialized.

我输入了物体的质量和高度:5kg,5m对于 GPE1和5kg,6m对于 GPE2 .

#include <stdio.h>
#define g 9.81

void main(void)
{
    // step 1: variable declaration
    float GPE1, GPE2, h;
    int m;
    // step 2: input
    printf("Mr Lim: The higher the object, the greater the Gravitational Potential Energy. \n");
    printf("Let me prove it to you with this simple physics question! \n\n");
    printf("An object is located at the surface of the earth. \n");
    printf("Calculate the Gravitational Potential Energy (in J) the body possesses. \n\n\n");
    printf("Enter the mass of the body (in kg): ");
    scanf("%d", &m);
    printf("Enter the height of the body (in m): ");
    scanf("%f", &h);

    if (h > 0) {
        // step 3: calculation
        GPE1 = m * g * h;
        // step 4: output
        printf("The Gravitational Potential Energy, GPE (in J) = %.2f joules. \n\n", GPE1);
    }
    else {
        printf("The Gravitational Potential Energy is undefined! \n");
    }

    printf("Mr Lim: Now, to prove my statement is valid \n");
    printf("Find the GPE a body possesses, when its height is greater. \n");
    printf("Enter the mass of the body (in kg): ");
    scanf("%d", &m);
    printf("Enter the height of the body (in m): ");
    scanf("%f", &h);

    if (GPE2 > GPE1) {
        GPE2 = m * g * h;
        printf("The Gravitational Potential Energy, GPE (in J) = %.2f joules. \n\n", GPE2);
        printf("Mr Lim: See class, I told you! \n");
    }
    else {
        printf("Class is not impressed. \n");
        printf("Mr Lim should retire! \n");
    }
}

Answer 1

错误陈述是正确的。您正在 if 语句中检查是否 GPE2 > GPE1，然后初始化 GPE2。

您可以在 if 语句上方添加一条语句，表示 GPE2 = 0;或者在程序顶部声明它时对其进行初始化。现在它保存着之前内存位置发生的任何垃圾。