Don't understand the problem here.

[snow wyvern]

So here's the code

#include<stdio.h>

int main()
{
    int choice;
    float f,c;
    
    printf("Enter the option no.\n");
    printf("1.Fahrenheit to Celcius\n");
    printf("2.Celcius to Fahrenheit\n");
    
    printf("choice : ");
    scanf("%d",choice);
    
    switch(choice)
        {
            
        case 1 : 
            {
            printf("Enter the temperature in °F : ");
            scanf("%f",f);
            
            c=(f-32)*5/9;
            
            printf("The temperature in °C is %f",c);
            
            break;
            }
            
        case 2 : 
            {
            printf("Enter the temperature in °C : ");
            scanf("%f",c);
            
            f=9/5*c+32;
            
            printf("The temperature in °F is %f",f);
            
            break;
            }
            
        default : 
            {
            printf("Invalid option.\n");
            }
            
        }
        
    printf("Program ended\n");
    return 0;
}

And this is the output

proot info: vpid 1: terminated with signal 11

[hybrid olive]

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[tribal crown]

You have to pass a pointer to the variable in scanf

scanf("%d", &choice);

Also, you spelt "Celcius" wrong

Celsius

[snow wyvern]

Silly me

[snow wyvern]

I don't think that causes any problems

! solved

!solved