Thread: Can we make a variable return a NULL value when we hit enter?

i have tried this but didn't work:

Code:

// some code here;

getchar();  //wait till the user hit enter;

// some code here;

Originally Posted by Laythe

i have tried this but didn't work:

Code:

// some code here;

getchar();  //wait till the user hit enter;

// some code here;

You're not gonna store anything if you call getchar like that. You have to assign a variable to it, like this.

Code:

int x = getchar();

What are you trying to do, exactly?

Originally Posted by Laythe

what i am trying to do is this:

You don't need a variable, then. I don't see how you couldn't do that with a simple getchar call.

here is my code:

Code:

#include <stdio.h>

float FahrenheitToCelsius(float x);
float CelsiusToFahrenheit(float x);

int main()
{
    float x;
    int   Choise;

start:
    x = Choise = 0;

    printf("Chose 1 Or 2 To Convert The Temperature:\n");
    printf("1. FahrenheitToCelsius\n");
    printf("2. CelsiusToFahrenheit\n");
    printf("Choise: ");
    scanf("%d", &Choise);

    if(Choise == 1)
    {
        printf("\nPlease Enter A Temperature In Fahrenheit: ");
        scanf("%f", &x);
        printf("The Entered    Temperature In Fahrenheit Is: %f\n", x);
        printf("The Equivalent Temperature In Celsius    Is: %f\n", FahrenheitToCelsius(x));
    }
    else
        if(Choise == 2)
        {
            printf("\nPlease Enter A Temperature In Celsius: ");
            scanf("%f", &x);
            printf("The Entered    Temperature In Celsius    Is: %f\n", x);
            printf("The Equivalent Temperature In Fahrenheit Is: %f\n", CelsiusToFahrenheit(x));
        }

    getchar();  // this getchar() is not doing the job in this case;
    goto start;
}

float FahrenheitToCelsius(float x)
{
    float C;
    float F;

    C = F = 0;

    F = x;

    C = (5.0/9.0)*(F-32.0);

    return C;
}

float CelsiusToFahrenheit(float x)
{
    float C;
    float F;

    C = F = 0;

    C = x;

    C = (5.0/9.0)*(F-32.0);

    F = ((9.0/5.0)*C)+32.0;

    return F;
}

might you please tell me why getchar() is not working as you said it should solve the problem, thank you.

You could always just read the FAQ on: Cprogramming.com FAQ > How do I get my program to wait for a keypress?


Quzah.