Question

对于本实验，我不允许编辑main函数，所有内容都必须在main下面的函数中完成。我似乎无法在这里找到我的问题。我认为它与对calculateBMI函数的调用有关。

SELECT SYSDATETIME();

Answer 1

在else if语句中，您使用了＆amp;运营商，但在这种情况下，您需要使用＆amp;＆amp;运营商。＆amp; operator是一个按位运算符。例如，如果您有两个4位变量1001和1010。你使用＆amp;运算符结果将为1000。在这种情况下，你必须使用＆amp;＆amp;操作者它应该是这样的：

    else if (BMI > 18.5 && BMI < 25)

Answer 2

您的代码中有许多简单的错误。

您应该在main之前定义您的calculateBMI函数，或者您应该在main之前声明它。
在调用calculateBMI函数时传递函数的参数/读取calculateBMI函数内的值。
如果您将BMI声明为double，则在printf语句中使用%lf作为格式说明符。
无法为else语句提供条件，因此请将其else if
使用方括号括起来 BMI = weightInPounds * 703 / heightInInches * heightInInches;
你应该传递scanf语句变量的地址（即＆amp;变量）

这是修改后的代码。

 #include <stdio.h>
    FILE *fp;
double calculateBMI();
    //For loop, which allows up to 4 entries.
    int main(void) {
        int i;

        fp = fopen("csis.txt", "w");
        for (i = 1; i <= 4; ++i) {
            calculateBMI();
        }
        fclose(fp);
        return 0;
    }

    //Function that calculates the BMI of the Input.
    double calculateBMI(int weightInPounds, int heightInInches) {
        double BMI=0;
                //Asks user for input weight in pounds.
        printf("What is your weight in pounds?");
        fprintf(fp, "What is your weight in pounds?");
        scanf("%d\n", &weightInPounds);
        fscanf(fp, "%d\n", weightInPounds);

        // Asks user for input height in inches.
        printf("What is your height in inches?");
        fprintf(fp,"What is your height in inches?");
        scanf("%d\n", &heightInInches);
        fscanf(fp, "%d\n", heightInInches);

        BMI = (weightInPounds * 703) / (heightInInches * heightInInches);

        //If BMi is less then 18.5 print this.
        if (BMI < 18.5) {
            printf("Your BMI is %f, you are underweight.", BMI);
            fprintf(fp, "Your BMI is %f, you are underweight.", BMI);
        }
        //if BMI is between 18.5 and less then 25 print this.
        else if (BMI > 18.5 & BMI < 25) {
            printf("Your BMI is %f, you are Normal.", BMI);
            fprintf(fp, "Your BMI is %f, you are Normal.", BMI);
        }
        //if BMI is greater then 25 and less then 30 print this.
        else if (BMI > 25 & BMI < 30) {
            printf("Your BMI is %f, you are Overweight.", BMI);
            fprintf(fp, "Your BMI is %f, you are Overweight.", BMI);
        }
        //if BMI is greater then 30 print this.
        else if(BMI > 30) {
            printf("Your BMI is %f, you are Obese.", BMI);
            fprintf(fp, "Your BMI is %f, you are Obese.", BMI);
        }



        getchar();
        return (0);
    }

额外信息。我认为在BMI公式中你应该给出以米为单位的高度/将其转换为米。

BMI计算器实验室无法找到问题

2 个答案: