C program

EMPS intranet

Note

This example demonstrate the effects of if() statements, by highlighting parts of the code that been executed in bold dark red . Try it and see which parts of the code are executed and which are skipped over.

Hi! Hi! Start main()

Try stepping through the code

Value and type of last evaluated expression: Address of array element: Address of array elementx: (none)

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Code

 Header...
 int main(){
   ... 

»  int option;

»  printf("\n Menu\n\n"
         "\t 1. Some option\n"
         "\t 2. Another option\n"
         "\t 3. A third option\n\n"
         "\t 0. Quit\n");
»  scanf("%d", &option);
  
»  switch (option) {
»  case 0:
»    printf("Goodbye, thanks for using the switch program\n");
»    return 0;
    
»  case 1:
»    printf("You chose option one.\n");
    // Oops! Forgot break; see what happens
    
»  case 2:
»    printf("You chose option two.\n");
»    break;
    
»  case 3:
»    printf("You chose option three.\n");
»    break;
    
»  default :
»    printf("Unkown option: %d\n", option);
  }
  
»  return 0;
}

Data

option (int)
128
1

Memory

main()
128	129	130	131
option = 1

NB: the actual memory address of each variable is the
address shown plus 4286693848 (0xFF81C1D8).

Show Advanced options

Input was:

1 0

Show output (Before looking at the output, work out what you think it put should be and see if you are right.)

Output

 Menu

	 1. Some option
	 2. Another option
	 3. A third option

	 0. Quit
You chose option one.
You chose option two.

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