#include<stdio.h>
#include<conio.h>
main()
{
clrscr();
float a,b;
char f,c;
printf("Enter c for centigrade and f for farenhight");
scanf("%c",&c);
if(c=='c')
{
printf("enter the temp in centigrade")
scanf("%f",&a);
b=(((a-32)*5)/9);
clrscr();
printf("The required temp in farenhight is : %f",b);
getch();
}
else
{
scanf("%c",&f);
if(f=='f')
{
printf("enter the temp in farenhight")
scanf("%f",&a);
b=(32+(9*a)/5);
clrscr();
printf("The required temp in centigrade is : %f",b);
getch();
}
else
printf(" please enter as per instructed")
getch();
}

/* I used the compile line:
gcc -Wall -W -pedantic temperature-gid080805.0.c -o temperature-gid080805.0 */

/* #include <conio.h>  ...don't use, keep code compilable on more platforms 
                 ...so you'll need to change occurances of getch() to getchar()
   clrscr();    ...also not cross platform , replace with a line or something
like: */

printf("\n************\n");

int main(){              /* <--  Use a return type for main(): */
     program stuff();
  return 0;              /* <-- return value at end of program */
}
 
/* temperature-gid080805.0.c:7: warning: ISO C90 forbids mixed declarations and code 
Move  variable declarations to top of bracketed scope before statements: */
int main(void)
{ 
  float a, b;
  char  f, c;
  statementstuff();
  ...

/* temperature-gid080805.0.c:14: error: expected ‘;’ before ‘scanf’
    printf("Enter the temp in centigrade")      NO */
    printf("Enter the temp in centigrade: ");   /* YES    

temperature-gid080805.0.c:36: warning: control reaches end of non-void function

  uh ohh... closing brackets not matching opening brackets somewhere, 
  print out the code on paper and check flow with a pencil!
 fix test fix test fix test fix test fix test fix test fix test fix...
*/

#include <stdio.h>
#include <conio.h>
main()
{
    clrscr();
    float a, b;
    char f, c;
    printf("Enter c for centigrade and f for farenhight");
    scanf("%c", &c);
    if (c == 'c') {
        printf("enter the temp in centigrade")
        scanf("%f", &a);
        b = (((a - 32) * 5) / 9);
        clrscr();
        printf("The required temp in farenhight is : %f", b);
        getch();
    }
    else {
        scanf("%c", &f);
        if (f == 'f') {
            printf("enter the temp in farenhight")
            scanf("%f", &a);
            b = (32 + (9 * a) / 5);
            clrscr();
            printf("The required temp in centigrade is : %f", b);
            getch();
        }
        else
            printf(" please enter as per instructed")
            getch();
    }