c - 文件输出变得奇怪

Question

在我的程序写入文本文件后，我收到奇怪的字符。例如:

Enter Weight in Pounds and Height in Inches: ÍÍÍÍYour BMI is: 25.11

超重

这些“ÍÍÍÍ”应该是数字，即:170 70。

还有其他人遇到过这个问题吗？如果您需要在这里查看我的代码。

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

FILE *fp;
void Calculate_BMI(double Weight_in_Pounds, double Hieght_in_Inches, double BMI);
int main()
{
    fp = fopen("csis.txt", "w");
    int i;
    double Wieght_in_Pounds, Hieght_in_Inches, BMI;

    Wieght_in_Pounds = 0;
    Hieght_in_Inches = 0;
    BMI = 0;
    for (i = 1; i <= 4; ++i) {
        Calculate_BMI(Wieght_in_Pounds, Hieght_in_Inches, BMI);
    }

    fclose(fp);
    system("pause");
    return(0);
}

void Calculate_BMI(double Weight_in_Pounds, double Hieght_in_Inches, double 
BMI)
{
    printf("Enter Weight in Pounds and Hieght in Inches: ");
    fprintf(fp, "Enter Weight in Pounds and Hieght in Inches: ");
    scanf(" %lf %lf", &Weight_in_Pounds, &Hieght_in_Inches);
    fscanf(fp, " %lf %lf", &Weight_in_Pounds, &Hieght_in_Inches);
    BMI = (Weight_in_Pounds * 703) / (Hieght_in_Inches * Hieght_in_Inches);
    printf("Your BMI is: %3.2lf\n", BMI);
    fprintf(fp, "Your BMI is: %3.2lf\n", BMI);
    if (BMI < 18.5) {
        printf("Under Weight\n");
        fprintf(fp, "Under Weight\n");
    }
    else if (BMI >= 18.5, BMI <= 25.0){
        printf("Normal weight\n");
        fprintf(fp, "Normal weight\n");
    }
    else if (BMI >= 25.0, BMI <= 30.0) {
        printf("Overweight\n");
        fprintf(fp, "Overweight\n");
    }
    else {
        printf("Obese\n");
        fprintf(fp, "Obese\n");
    }
}

Answer 1

1. 无效操作fscanf()在以写入模式打开的文件上 ( w )。删除fscanf()声明。

2. 替换 ,与 && if 中的运算符声明。 comma的结果( , ) 运算符与其序列中最右边的操作数具有相同的类型和值。所以只有 BMI <= 25.0 的结果和BMI <= 30.0被考虑。

   if (BMI >= 25.0 && BMI <= 30.0)
   

3. 另外不要忘记检查 fopen() 的返回值和scanf() .