C - Switch on integer and choose three winning numbers

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Introduction

The following code chooses winning numbers.

Users are required to guess a winning number, and the switch statement tells them about any valuable prizes they may have won:

Demo

#include <stdio.h>

int main(void)
{
  int choice = 0;            // The number chosen

                 // Get the choice input
  printf("Pick a number between 1 and 10! ");
  scanf("%d", &choice);

  // Check for an invalid selection
  if ((choice > 10) || (choice < 1))
    choice = 11;         // Selects invalid choice message
  switch (choice)
  {// ww w .j  av  a2 s.co m
  case 7:
    printf("Congratulations!\n");
    printf("You win :seven.\n");
    break;                 // Jumps to the end of the block

  case 2:
    printf("You win :two.\n");
    break;                 // Jumps to the end of the block

  case 8:
    printf("You win :eight.\n");
    break;                 // Jumps to the end of the block

  case 11:
    printf("Try between 1 and 10. You wasted your guess.\n");
    // No break - so continue with the next statement

  default:
    printf("Sorry, you lose.\n");
    break;                 // Defensive break - in case of new cases
  }
  return 0;
}

Result

how It Works

We have the switch statement, which will select the value of choice: 

switch(choice)
{
      . . .
}

if choice has the value 7, the case corresponding to that value will be executed: 

case 7:
      printf("Congratulations!\n");
      printf("You win :seven.\n");
      break;                        // Jumps to the end of the block

The two printf() calls are executed, and the break will jump to the statement following the closing brace for the block.

The next case is a little different: 

case 11:
  printf("Try between 1 and 10. You wasted your guess.\n");
                         // No break - so continue with the next statement

There's no break statement, so execution continues with the printf() for the default case after displaying the message.

The default case is: 

default:
  printf("Sorry, you lose.\n");
  break;                 // Defensive break - in case of new cases

This will be selected if the value of choice doesn't correspond to any of the other case values.

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