Prime Number or Not

#include
#include
void main()
{
int a,i,n,flag=0;
clrscr();
printf("Enter Value to Find Prime Number or Not : ");
scanf("%d",&n);
for(i=2;i {
if((n%i)==0)
{
flag=1;
break; /*or i=i+a; */
}
}
if(flag==1)
printf("\t%d is Not a Prime Number",n);
else
printf("\t%d is Prime Number",n);
getch();
}
/* OR
void main()
{
int n,i=2;
clrscr();
printf("Enter Value to Find Prime or Not : ");
scanf("%d",&n);
while(i<=n-1)
{
if((n%i)==0)
{
printf("\t%d is Not a Prime Number",n);
break;
}
else
{
++i;
}
if(i==n)
printf("\t%d is Prime Number",n);
}
getch();
}
*/
Output
Enter Value to Find Prime Number or Not : 3
3 is Prime Number
Enter Value to Find Prime Number or Not : 6
6 is Not a Prime Number