why use switch case in c code example

Example 1: switch case c

switch (expression) {
    case constant1:
      // statements
      break;

    case constant2:
      // statements
      break;

    default:
      // default statements
}

Example 2: switch case in c syntax

switch( expression )
{
	case value-1:
			Block-1;
			Break;
	case value-2:
			Block-2;
			Break;
	case value-n:
			Block-n;
			Break;
	default:
			Block-1;
			Break;
}
Statement-x;