Programming in C: Switch Case Statements

The switch case statement in C is a substitute for a long if statement that compare integer values. Here is the general form for a switch case:

switch (variable_name)
{
case value_1:
/* Code to execute if variable_name == value_1 */
break;
case value_2:
Code to execute if variable_name == value_2
break;
...
case value_n:
Code to execute if variable_name == value_n
break;
default:
/* Code to execute if <variable> does not equal the value following any of the cases. */
break;
}

The condition in a switch statement is a value, typically an integer. If the value in the case matches the switch value, then whatever code appears after the colon. A break statement is used to exit the switch case statement. Here is a practical example of a switch case statement:

#include <stdio.h>

void playgame()
{
printf( "Play game called" );
}
void loadgame()
{
printf( "Load game called" );
}
void playmultiplayer()
{
printf( "Play multiplayer game called" );
}
	
int main()
{
int input;

printf("1. Play game\n");
printf("2. Load game\n");
printf("3. Play multiplayer\n");
printf("4. Exit\n");
printf("Selection: ");
scanf("%d", &input);
switch (input) 
  {
case 1:
playgame();
break;
case 2:
loadgame();
break;
case 3: 
playmultiplayer();
break;
case 4:
printf("Thanks for playing!\n");
break;
default:
printf("Bad input, quitting!\n");
break;
}
return 0;

}

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