我现在正在练习c编程，我做了一些BMI计算器。它工作得很好，但当用户在第一个scanf上输入字符串或字符，将数据发送到浮动变量'weight'。在那之后它通过了所有的scanf，并向我显示了Your BMI is 1.#J的错误。如何解决这个错误？这是我的密码。
#include <stdio.h>
int main()
{
float weight;
float height;
float result;
float c_height;
printf("Enter your weight as kilogram...\n\n> ");
scanf("%f",&weight);
//If user input char or string , it passed all thing and showed error.
printf("\nEnter your height as centimetres...\n\n> ");
scanf("%f",&height);
c_height=(height/100)*(height/100);
result=weight/c_height;
if(result<18.50)
{
printf("\nYour BMI is %.2f\n\n",result);
printf("You are underweight! Try to eat more frequently\n\n");
printf("Thank you for using my program!\n\n");
}else if(result>=18.50 && result<22.90)
{
printf("\nYour BMI is %.2f\n\n",result);
printf("You are healthy! Keep eating healthy\n\n");
printf("Thank you for using my program!\n\n");
}else if(result>=22.90 && result<24.90)
{
printf("\nYour BMI is %.2f\n\n",result);
printf("You are a little overweight! Avoid eating some fat and an oil\n\n");
printf("Thank you for using my program!\n\n");
}else if(result>=24.90 && result<29.90)
{
printf("\nYour BMI is %.2f\n\n",result);
printf("You are overweight! Avoid eating fat and do exercise often\n\n");
printf("Thank you for using my program!\n\n");
}else if(result>=29.90)
{
printf("\nYour BMI is %.2f\n\n",result);
printf("You are obese! Do exercise everyday and eat carefully!\n\n");
printf("Thank you for using my program!\n\n");
}else
{
printf("Error occured!!");
}
return 0;
}
最佳答案
scanf将返回读入的值的数目，因此在您的示例中应该是一个，因为您正在读取一个浮点值。
您可以检查scanf是否返回该值，如果它在行尾之前不执行诸如读取之类的恢复：
while(scanf("%f",&height) != 1)
{
int c;
while((c = getchar()) != '\n' && c != EOF)
;
printf("Enter your weight as kilogram...\n\n> ");
}
关于c - 当用户在scanf中输入一个保留float变量的字符串时发生错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45656148/