Question

输出应该是小的十进制值。我已经完成了它似乎是正确的，但输出仍然是零。例如，如果我分别输入120,230,20和15，它应吐出0.017，但我仍然为零。

#include <stdio.h>

#define WALK_CAL 5
#define STAND_CAL 2
#define DRINK_CAL 20
#define FOOD_CAL 40
#define CALS_PER_POUND 3500

int main(void) {

    int walking_min, standing_min;
    int drinking_min, eating_min;
    float end_calories;

    //Get User Input
    printf("How long were you walking (in minutes) ?\n");
    scanf("%d", &walking_min);

    printf("How long were you standing (in minutes) ?\n");
    scanf("%d", &standing_min);

    printf("How long were you drinking (in minutes) ?\n");
    scanf("%d", &drinking_min);

    printf("How long were you eating (in minutes) ?\n");
    scanf("%d", &eating_min);

    //Evaluate User Input
    end_calories = ( ( (WALK_CAL*walking_min) + (STAND_CAL*standing_min) - (DRINK_CAL*drinking_min) - (FOOD_CAL*eating_min) ) / CALS_PER_POUND );

    //Output Final Value
    printf("You lost %.3f pounds today!\n", end_calories);

    return 0;

}

提前致谢！

Answer 1

您看到的是整数截断。最终卡路里数量的小数部分被切断。解决这个问题的一种方法是除以浮点数，即除以：

(CALS_PER_POUND * 1.0)

或者，如果您不介意更改常量，可以使用：

#define CALS_PER_POUND 3500.0f

为什么我的代码输出0？

1 个答案: