Wap to find sum of first ODD or EVEn numbers using SWITCH CASE

/*write a c program to add first 10 odd or even numbers*/

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

void main()

{
 int n,c,sum=0;
 clrscr();
 printf("1.sum of first 10 odd numbers");
 printf("\n2.sum of first 10 even numbers");
 printf("\nenter your choice:");
 scanf("%d",&c);
 switch(c)
 {
 case 1:
  for(n=1;n<=20;n=n+2)
  {
   sum=sum+n;
  }
  printf("sum:%d",sum);
 break;
 case 2:
  for(n=2;n<=20;n=n+2)
  {
   sum=sum+n;
  }
  printf("sum:%d",sum);
 break;
 }
 getch();
}