write a menu driven program for x^2,x^3,x^4,x^5 of integer x

/*write a menu driven program for x^2,x^3,x^4,x^5 of integer x*/
#include<stdio.h>
#include<conio.h>
#include<math.h>

void main()

{
 long int x,c,ans;
 clrscr();
 printf("enter the value of x:");
 scanf("%ld",&x);
 printf("\n1.x^2\n\n2.x^3\n\n3.x^4\n\n4.x^5");
 printf("\n\nenter your choice:");
 scanf("%ld",&c);
 switch(c)
  {
   case 1:ans=pow(x,2);
    printf("\nans:%ld",ans);
    break;
   case 2:ans=pow(x,3);
    printf("\nans:%ld",ans);
    break;
   case 3:ans=pow(x,4);
    printf("\nans:%ld",ans);
    break;
   case 4:ans=pow(x,5);
    printf("\nans:%ld",ans);
    break;
   default:
    printf("\ninvalid choice");
  }
 getch();
}