switch is a keyword of C language.
Example C program explaining use of switch
#include<stdio.h>
main()
{
int n;
printf("Enter a number from 1, 2 or 3.\n");
scanf("%d", &n);
switch(n)
{
case 1:
case 2:
case 3:
printf("Thanks!\n");
break;
default:
printf("You didn't did what I said.\n");
}
return 0;
}