简单的 C 编码问题：跳过 Printf 并跳过用户输入

Question

https://onlinegdb.com/-9jZX-uU0 [链接]

我想让第二行代码让用户输入华氏度而不是摄氏度两次。 int main() 代码是正确的，output 数字是正确的，但用户没有输入华氏温度。 我该如何解决？ 在此处输入图像描述

预期的是用户输入华氏度并且代码继续。 我不希望 output 跳过第 12-14 行。 我不知道如何解决这个问题。 我希望一旦用户输入华氏度，代码将继续像当前一样运行

#include <stdio.h>
#include <math.h>
double ask_for_air_celcius()

{
double temp_celcius, temp;

printf("Enter the current air temperature(in Celcius): ");
scanf(" %lf", &temp_celcius);
return(temp_celcius);

printf("Enter the current air temperature(in Fahrenheit): ");
scanf(" %lf", &temp);
return (temp);
}


int main()


{

double temp_celcius, spsound_1,spsound_convert_1,temp, 
spsound,spsound_convert;

{
    temp_celcius = ask_for_air_celcius(); 
    spsound_1 = 1086 * sqrt(((5 * (temp_celcius*1.8+32)) + 297) 
     / 247);
    spsound_convert_1=spsound_1*1.09728;
    
    temp = ask_for_air_celcius(); 
    spsound = 1086 * sqrt(((5 * temp) + 297) / 247);
    spsound_convert=spsound*1.09728;
    
    printf("\nThe speed of sound at %.2f degrees Celcius is %.2f 
    ft/s.\n", temp_celcius, spsound_1);
    printf ("The speed of sound at this temperature in Celciusis 
    equivalent to %.2f km/h.\n\n", spsound_convert_1);
   printf("The speed of sound at %.2f degrees Fahrenheit is %.2f 
   ft/sec.\n", temp, spsound);
   printf ("The speed of sound at this temperature in Fahrenheit 
   is equivalent to %.2f km/h.\n", spsound_convert);
    }
   return(0);
    }

Answer 1

您在 function 中使用了return两次，这样它就won't go ahead go 询问华氏度问题。 每当在编译时遇到return时，它只会在那里终止 function。

现在你可以做的就是为华氏温度制作另一个function并将华氏温度部分复制粘贴到其中。

#include <stdio.h>
#include <math.h>
double ask_for_air_celcius(){
    double temp_celcius;
    printf("Enter the current air temperature(in Celcius): ");
    scanf(" %lf", &temp_celcius);
    return(temp_celcius);
}

double ask_for_air_Fahrenhiet(){
    double temp;
    printf("Enter the current air temperature(in Fahrenheit): ");
    scanf(" %lf", &temp);
    return (temp);
}

int main()


{

double temp_celcius, spsound_1,spsound_convert_1,temp, 
spsound,spsound_convert;

{
    temp_celcius = ask_for_air_celcius(); 
    spsound_1 = 1086 * sqrt(((5 * (temp_celcius*1.8+32)) + 297) 
     / 247);
    spsound_convert_1=spsound_1*1.09728;
    
    temp = ask_for_air_Fahrenhiet();//changes here 
    spsound = 1086 * sqrt(((5 * temp) + 297) / 247);
    spsound_convert=spsound*1.09728;
    
    printf("\nThe speed of sound at %.2f degrees Celcius is %.2f ft/s.\n", temp_celcius, spsound_1);
    printf ("The speed of sound at this temperature in Celciusis equivalent to %.2f km/h.\n\n", spsound_convert_1);
    printf("The speed of sound at %.2f degrees Fahrenheit is %.2f ft/sec.\n", temp, spsound);
    printf ("The speed of sound at this temperature in Fahrenheit is equivalent to %.2f km/h.\n", spsound_convert);
}
   return(0);
    }

希望能帮助到你;！！ ;)