High School Mathematics Extensions/Mathematical Programming/Exercise 1: Implementing Commands

Explanation

Includes

Type Definitions

Function Prototypes

Global Variables

Function Definitions

Code to change

Add and replace the following code:

//function definitions
//...
int get_integer()
 {
    int ret_val;
    char lastpress;
    
    cprintf("Enter integer: ");
    cscanf("%i",&ret_val);
    lastpress=getch();
    cprintf("\n");
    return ret_val;
 }
//...
void execute_command(char command)
 {
    switch (command)
    {
        case '/':   output_divide();
                    break;
        case '%':   output_modulus();
                    break;
        case '=':   output_values();
                    break;
        case 'r':
        case 'R':   r=get_integer();
                    output_values();
                    break;
        case 'l':
        case 'L':   l=get_integer();
                    output_values();
                    break;
        case 'x':
        case 'X':   done=TRUE;
                    break;
    }
 }
 void output_divide()
 {
     if (r > 0)
        {
         cprintf("%d / %d = %d.\n",l,r,l/r);
        }
    else
        {
         cprintf("l = %d, r = %d. Please set r to a value other than 0.\n",r,l);
        }
 }
 void output_modulus()
 {
    if (r > 0)
        {
         cprintf("%d %% %d = %d.\n",l,r,l%r);
        }
    else
        {
         cprintf("l = %d, r = %d. Please set r to a value other than 0.\n",r,l);
        }
 }
 void output_values()
 {
     cprintf("l = %d, r = %d.\n",l,r);
 }

Next Step

• Exercise 1: The Complete Program