Program to convert temperature from Fahrenheit to Celsius or Celsius to Fahrenheit

#include<stdio.h>
#include<conio.h>

void main()
{
    double temp,ctemp;
    int ch;
    clrscr();   
    printf("\n Select your choice ");
    printf("\n\t1.Fahrenheit to Celsius");
    printf("\n\t2.Celsius to Fahrenheit");
    printf("\n Enter your choice(1/2) : ");
    scanf("%d",&ch);


    if(ch==1)
    {
        printf("\n Enter Temperature in Fahrenheit : ");
        scanf("%lf",&temp);
        ctemp=(temp-32)/1.8;
        printf("\n Temprature in celcius is : %lf",ctemp);
    }
    else
        if(ch==2)
        {
            printf("\n Enter Temperature in Celsius : ");
            scanf("%lf",&temp);
            ctemp=(1.8*temp)+32;
            printf("\n Temperature in Fahrenheit is : %lf",ctemp);
        }
    else
        printf("\n Wrong choice.....!!");
    getch();   
}


                                                           Output