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,但是当用户在第一个将数据发送到浮点变量 'weight' 的 scanf
上输入字符串或字符时。之后它通过了所有 scanf
并向我显示错误 Your BMI is 1.#J
。如何解决这个错误?这是我的代码。
#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量,因此在您的示例中应该是一个,因为您正在读取单个浮点值。
您可以检查 scanf 是否返回该值,以及它是否不进行某种恢复,例如读取到行尾:
while(scanf("%f",&height) != 1)
{
int c;
while((c = getchar()) != '\n' && c != EOF)
;
printf("Enter your weight as kilogram...\n\n> ");
}
关于c - 当用户在保持 float 变量的 scanf 中输入字符串时出错,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45656148/