write a menu driven program to find out x^2,x^3,x^4, x^5 if x is a number, entre through keyboard

/*write a menu driven program to find out x^2,x^3,x^4,
x^5 if x is a number, entre through keyboard*/

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

void main()

{
	long int x,c,ans;
	clrscr();
	printf("Enter Value of x:");
	scanf("%ld",&x);
	printf("\n\n1.x^2\n2.x^3\n3.x^4\n4.x^5\n");
	printf("\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");
			break;
	}
	getch();
}