http://stackoverflow.com/questions/14424897/what-is-the-error-in-this-programsomeone-please-tel-me

gistfile1.txt

#include<stdio.h>
#include<conio.h>
#include<math.h>
main()
{
  int a,b ,c,fac,d,rem,g,j,rem_1,e;
  char another;
  printf("Which one would you like to choose");
  printf("\n1. Factorial Of a number \n 2.Prime or not\n 3. Odd or even\n 4. Exit ");
  scanf("%d %d %d %d",&a);
  while (a==1)
  {
    clrscr();
    printf("You have choose n to find the factorial of a number.\n Please enter the number of your choice ");
    scanf("%d",&b);
    fac=1;
    c=1;
    while(c<=b){
      fac=fac*c;
      c++;
      printf("The factorial of %d = %d",b,fac);
    }
  }        
}
while(a==2)
{
  clrscr();
  printf("You have choosen to find if the number is prime or not \n Please enter the number of your choice");
  scanf("%d",d);
  for(e=1; e<=d;e++)
  {
    rem=d%e;
    if(rem==0)
      printf("The number is not a prime number");
    else
      printf("The number is a prime number");
  }
}
while(a==3)
{
  clrscr();
  printf("You have choosen to find if the number is odd or even \n Please enter the number of your choice ");
  scanf("%d",&g);
  j=2;
  rem_1=(g%j);
  if(rem_1==0)
    printf("The number is an even number ");
  else 
    printf("The number is an odd number");
}
}