编译器不会将长*宽*高计算为立方英寸

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我正在做一个相对简单的程序来计算长*宽*高为立方英寸。我应该得到像 XXXXXXX.XX 这样的答案但编译器却给了我 0.000000

我没有其他错误。我的主要问题是如何获取要计算的数字？

#include <stdio.h>

double length;
double width;
double height;

// This is the volume in cubic inches.
double VolumeCubicInch;

// This is the volume in cubic feet.
double VolumeCubicFeet;

int main() {
    // Ask the user to enter the length width and height of a box (in inches).

    // First print asks user to enter the length of a box in inches.
    printf("Please enter the length of a box in inches.\n");
    // The user reads in the length number of the box in inches.
    scanf("%lf", &length);

    // Second print asks user for the width of the box in inches.
    printf("Now please enter the width of the box in inches.\n");
    // The user reads in the width number in inches.
    scanf("%lf", &width);

    // Then the third print asks user for the height of the box in inches.
    printf("Please enter the height of box in inches.\n");
    // The user reads in the height of the box in inches.
    scanf("%lf", &height);

    // Calculate the volume of the box, in cubic inches and output the result.
    // Using a newly created variable called VolumeCubicInch, it will allow the        calculation
    // of the box's volume to be calculated in cubic inches.
    // Length output given: 15.8
    // Width output given: 23.34
    // Height output given: 75.345
    VolumeCubicInch = length * width * height;
    // The resulted volume in cubic inches will be outputted using a print   statement.
    // Output should be: The volume is XXXXXXX.XX cubic inches.
    printf("The volume is %lf cubic inches.\n", &VolumeCubicInch);

    // Calculate the volume in cubic feet, and output the result.
    // Using the variable VolumeCubicFeet will produce the volume in cubic feet.
    // VolumeCubicFeet = ;
    // The value or result of the volume in cubic feet will be outputted using     the variable VolumeCubicFeet.
    // The output should be: The volume is XXXX.XX cubic feet.
    // printf("The volume is %lf cubic feet.\n", &VolumeCubicFeet);

    // Note that a box that is 12 x 12 x 12 inches is 1.0 cubic feet.
    // *Be sure that your program gets that answer.*

    system("PAUSE");
    return 0;
}

Answer 1

您传递结果的地址而不是其值:

printf("The volume is %lf cubic inches.\n", &VolumeCubicInch);

您应该传递该值并指定 2 位小数:

printf("The volume is %.2f cubic inches.\n", VolumeCubicInch);

注释:

• l 修饰符对于 scanf 转换为 double 格式而不是 float 是必需的。 printf 始终将 float 值提升为 double，因此 %f 格式用于两者，并且 如果指定，l 将被忽略。
• 对于 long double 类型，您可以在 scanf 和 printf 中使用 %Lf 转换说明符。
• 您可以通过在 % 和 f 格式字符之间的小数点后传递精度字段来指定小数位数。