Function040

Write a menu driven 'C' program , which prints the options 1,2,3 (as given below) and asks the user to select an option. If user options :
                   1  then find the factors of the entered number
                   2  then check whether the entered number is prime number or not
                   3  then directly exit from the program
The menu should be displayed by a function.

#include <stdio.h>
#include <conio.h>
#include <process.h>
void factor ( int    n )
{         
        int       i;
        printf("\n\t\t The factors are..:");
        for ( i = 1; i <= n; i++ )
        {                                
                  if ( n % i == 0 )
                  {                                            
                                printf("%d, ",i);
                  }                                         
        }                                      
}                                
                             
int prime ( int    n )
{                       
        int      i;
        for ( i = 2; i < n; i++ )
        {                                 
                  if ( n % i == 0 )
                                return 0;
        }
        return 1;
}                              

void menu ( )
{                 
        printf("\n\n\t\t*********************************************\n\n");
        printf("\n\t\t PRESS 1 TO FIND FACTORS\n");
        printf("\n\t\t PRESS 2 TO CHECK IF THE NUMBER IS PRIME\n");
        printf("\n\t\t PRESS 3 TO EXIT\n");
        printf("\n\n\t\t*********************************************\n\n");
}                              
                     
void main ( )
{            
        int      n, ch;
        clrscr ( );
        while ( 1 )
        {                           
               clrscr ( );
               menu ( );
               printf("\n\t\t Enter your choice..:"); scanf("%d",&ch);
               switch ( ch )
               {                                
                      case 1:
                                  printf("\n\t\t Enter a number..:"); scanf("%d",&n);
                                  factor ( n );
                                  break;
                      case 2: 
                                  printf("\n\t\t Enter a number..:"); scanf("%d",&n);
                                  if ( prime ( n ) )
                                             printf("\n\t\t The number is prime.");
                                  else                        
                                             printf("\n\t\t The number is not prime.");
                                  break;
                      case 3:       
                                  exit ( 0 );
                      default: 
                                  printf("\n Please enter a correct choice.");
               }
               getch ( );
        }
}

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