Question

the do statement in C++

Asked by: eatsbugs

can anyone tell me what is wrong with this code?:

#include <iostream>
#include <stdlib.h>

using namespace std;

void mainMenu();
void subMenu1();

int main(int argc, char *argv[])
{
  cout << "This is a James Phillips design and production.\n\n";
 
  mainMenu();
 
  return 0;
}

void mainMenu(void)
{
    int num;
   
    cout << "1. Pythagorean Theorem";
    cout << "\n2. Quadratic Equation";
    cout << "\n3. Distance Formula";
    cout << "\n4. Midpoint Equation";
    cout << "\n5. Geometric Formulas";
    cin >> num;
 do {
    switch(num) {
    case '1':
    cout << "One";
    break;
    case '2':
    cout << "Two";
    break;
    case '3':
    cout << "Three";
    break;
    case '4':{
    subMenu1();
    break;}
    case '5':
    cout << "Five";
    break;
    }}}

void subMenu1(void)
{
    cout << "This is a subMenu...\n";
    system("PAUSE");
}

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Asked On
2003-09-11 at 07:44:09ID20735854
Topic

C++ Programming Language

Participating Experts
5
Points
20
Comments
8

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Answers

 

by: imladrisPosted on 2003-09-11 at 07:52:38ID: 9337427

A do expects a while with it to explain when to stop:

do
{   //stuff
     ...
} while( /*condition*/);

where condition is some logical condition, e.g. i<10 or num!=5.

 

by: John_DrakePosted on 2003-09-11 at 07:55:04ID: 9337442

The "do" statement in C/C++ is "do ... while()"

So you either need to put a while statement at the bottom of your loop

do {
   switch(num) {
      case '1':
         cout << "One";
         break;
      case '2':
         cout << "Two";
         break;
      case '3':
         cout << "Three";
         break;
      case '4':{
         subMenu1();
         break;}
      case '5':
         cout << "Five";
         break;
   }
} while (/* your condition */);

If an infinite loop is what you want, then use the more standard

while (1) { /* code in here */ }

or

for (;;) { /* code in here */

John

 

by: John_DrakePosted on 2003-09-11 at 07:56:53ID: 9337453

imladris beat my post by 3 minutes! sigh.

John

 

by: sundeepguptaPosted on 2003-09-12 at 02:52:04ID: 9344485

we dont have a "do" loop but infact a "do-while" loop.
Thus a "do" expects a "while" to terminate the "do" block of code.

Windows yields syntax error for this.

Sundeep

 

by: imladrisPosted on 2003-09-12 at 07:50:47ID: 9346261

Did that answer help?

If so, it is now time to grade the answer.

If not, please ask a clarifying question.

 

by: VEngineerPosted on 2003-09-15 at 08:48:53ID: 9363847


Just a brief comment on JohnDrake's comment, I think these days the preferred form of an infinite loop according to Stroustrup himself is:

while (true)
{
}

 

by: tinchosPosted on 2004-01-26 at 17:03:58ID: 10205671

No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: imladris {http:#9337427}

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Tinchos
EE Cleanup Volunteer

20120131-EE-VQP-002

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