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M3KillU
Grandmaster Cheater
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Posts: 793
Location: California, USA
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 Posted: Fri Nov 09, 2007 6:09 pm Post subject: [Need Help] Calling back to "main()" in C++ |
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Hey, I'm just starting to learn C++ and I was wondering how you would call back to main...
One more thing, you may or may not recognize
My compiler: CodeGear RAD Studio C++ 2007 - Made by Borland
automatically inserts that when you want to make something in command prompt (or maybe anything).
I am making a calculator (Im Command Prompt) and I need to be able to call back to main after using an if comparison...
Here is the script:
| Code: |
//---------------------------------------------------------------------------
#include <iostream>
#include <vcl.h>
#pragma hdrstop
#pragma argsused
//---------------------------------------------------------------------------
using namespace std;
int Choice, a, b, c;
int Add(int num1, int num2)
{
return (num1 + num2);
}
//----------------------------------
int Sub(int num3, int num4)
{
return (num3 - num4);
}
//----------------------------------
int Mult(int num5, int num6)
{
return (num5 * num6);
}
//----------------------------------
int Div(int num7, int num8)
{
return (num7 / num8);
}
int main()
{
cout << "What do you want to do? Do you want to multiply, divide, subtract, or add?\n";
cout << "Well.. please type in a number...\n";
cout << "Add =\t\t" "1" << endl << "Subtract = \t" "2" << endl << "Multiply =\t" "3" << endl << "Divide =\t" "4\n\n";
cin >> Choice;
cout << endl << endl;
//------------------------If Comparisons-------------------------------------
if (Choice == 1) {
cout << "You chose to Add!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "+ \n";
cin >> b;
c=Add(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 2) {
cout << "You chose to Subtract!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "- \n";
cin >> b;
c=Sub(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 3) {
cout << "You chose to Multiply!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "x \n";
cin >> b;
c=Mult(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 4) {
cout << "You chose to Divide!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "(divided by) \n";
cin >> b;
c=Div(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice > 4) {
cout << "That doesn't work.\n";
cout << "Pick a number between 1 and 4\n";
}
if (Choice < 1) {
cout << "That doesn't work.\n";
cout << "Pick a number between 1 and 4\n";
}
system("PAUSE");
return 0;
}
|
I need to call back to main here:
| Code: |
if (Choice > 4) {
cout << "That doesn't work.\n";
cout << "Pick a number between 1 and 4\n";
//Call to main() here
}
if (Choice < 1) {
cout << "That doesn't work.\n";
cout << "Pick a number between 1 and 4\n";
//Call to main() here |
If that doesn't work... I'm going to try turning all of the code in main... to... "void Calc()"
then setting main below that as:
| Code: |
main()
{
Calc();
system("PAUSE");
return 0;
} |
The original main will be the exact same thing (if it works) and will just be called "void Calc()"
So... main question is just... can i call back to main? if so... how?
----Oh... and I only know basic C++ at the moment.
Thanks, hope you can help me.
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Last edited by M3KillU on Fri Nov 09, 2007 6:19 pm; edited 1 time in total |
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oib111
I post too much
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Joined: 02 Apr 2007
Posts: 2947
Location: you wanna know why?
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| Posted: Fri Nov 09, 2007 6:18 pm Post subject: |
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You could make it a loop.
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| 8D wrote: |
cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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M3KillU
Grandmaster Cheater
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Joined: 06 Apr 2007
Posts: 793
Location: California, USA
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| Posted: Fri Nov 09, 2007 6:20 pm Post subject: |
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How do I do that?
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Symbol
I'm a spammer
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Joined: 18 Apr 2007
Posts: 5094
Location: Israel.
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| Posted: Fri Nov 09, 2007 6:21 pm Post subject: |
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While/For/Goto/Timer. (From best to lame coding... I dunno if timers are lamer than goto's  )
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lurc
Grandmaster Cheater Supreme
 Reputation: 2
Joined: 13 Nov 2006
Posts: 1900
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| Posted: Fri Nov 09, 2007 6:23 pm Post subject: |
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Dont Forget the Do While Loop, thats always good 
goto's sooo lammemee
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M3KillU
Grandmaster Cheater
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Joined: 06 Apr 2007
Posts: 793
Location: California, USA
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| Posted: Fri Nov 09, 2007 6:24 pm Post subject: |
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Symbol... I'm glad you could help but... Where would I put that? lol
I'm only barely learning C++
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samuri25404
Grandmaster Cheater
 Reputation: 7
Joined: 04 May 2007
Posts: 955
Location: Why do you care?
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| Posted: Fri Nov 09, 2007 6:25 pm Post subject: |
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| Code: |
for (int i = 0; i < 1; i ++)
{
//Do some stuff
:
:
:
//Uh oh, we need to leave
break;
//Or if you want it to loop still after this ( even though you won't need to in this, it's just for future references )
//continue;
}
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atom0s
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 Reputation: 205
Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
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| Posted: Fri Nov 09, 2007 6:25 pm Post subject: |
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| Code: | #include <iostream>
using namespace std;
int main()
{
int iNum = 0;
bool bLoop = true;
while( bLoop )
{
cout << "Enter A Number: ";
cin >> iNum;
switch( iNum )
{
case 1:
cout << "You entered 1" << endl;
break;
case 2:
cout << "You entered 2" << endl;
break;
case 3:
cout << "You entered 3" << endl;
break;
case 4:
bLoop = false;
break;
}
}
cin.ignore();
cin.sync();
return 0;
} |
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M3KillU
Grandmaster Cheater
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Posts: 793
Location: California, USA
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| Posted: Fri Nov 09, 2007 6:30 pm Post subject: |
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What do:
bLoop
while
switch
case
break
cin.ignore()
cin.sync()
....
do?
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atom0s
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Posts: 8587
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| Posted: Fri Nov 09, 2007 6:33 pm Post subject: |
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| M3KillU wrote: | What do:
bLoop
while
switch
case
break
cin.ignore()
cin.sync()
....
do? |
If you don't know what While, Switch, Case, and Break are you should go back and learn the basics before you start doing anything as they will be use A LOT in any program you create.
Check out this site for most of the basics, google the rest that you come across:
http://www.cplusplus.com/doc/tutorial/
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M3KillU
Grandmaster Cheater
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Joined: 06 Apr 2007
Posts: 793
Location: California, USA
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| Posted: Fri Nov 09, 2007 6:34 pm Post subject: |
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I'm still learning C++
I just thought there would be an easier way to call... oh well... Looks like it's back to the book (Sam's Teach Yourself C++ in 21 Days)
EDIT:
I made another script.
| Code: | //---------------------------------------------------------------------------
#include <iostream>
#include <vcl.h>
#pragma hdrstop
#pragma argsused
//---------------------------------------------------------------------------
using namespace std;
int Choice, a, b, c;
int Add(int num1, int num2)
{
return (num1 + num2);
}
//----------------------------------
int Sub(int num3, int num4)
{
return (num3 - num4);
}
//----------------------------------
int Mult(int num5, int num6)
{
return (num5 * num6);
}
//----------------------------------
int Div(int num7, int num8)
{
return (num7 / num8);
}
void Calc()
{
cout << "You messed up... let's try again...\n\n";
cout << "What do you want to do? Do you want to multiply, divide, subtract, or add?\n";
cout << "Well.. please type in a number...\n";
cout << "Add =\t\t" "1" << endl << "Subtract = \t" "2" << endl << "Multiply =\t" "3" << endl << "Divide =\t" "4\n\n";
cin >> Choice;
cout << endl << endl;
//------------------------If Comparisons-------------------------------------
if (Choice == 1) {
cout << "You chose to Add!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "+ \n";
cin >> b;
c=Add(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 2) {
cout << "You chose to Subtract!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "- \n";
cin >> b;
c=Sub(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 3) {
cout << "You chose to Multiply!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "x \n";
cin >> b;
c=Mult(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 4) {
cout << "You chose to Divide!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "(divided by) \n";
cin >> b;
c=Div(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice > 4) {
cout << "That doesn't work.\n";
Calc();
}
if (Choice < 1) {
cout << "That doesn't work.\n";
Calc();
}
}
int main()
{
cout << "What do you want to do? Do you want to multiply, divide, subtract, or add?\n";
cout << "Well.. please type in a number...\n";
cout << "Add =\t\t" "1" << endl << "Subtract = \t" "2" << endl << "Multiply =\t" "3" << endl << "Divide =\t" "4\n\n";
cin >> Choice;
cout << endl << endl;
//------------------------If Comparisons-------------------------------------
if (Choice == 1) {
cout << "You chose to Add!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "+ \n";
cin >> b;
c=Add(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 2) {
cout << "You chose to Subtract!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "- \n";
cin >> b;
c=Sub(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 3) {
cout << "You chose to Multiply!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "x \n";
cin >> b;
c=Mult(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice == 4) {
cout << "You chose to Divide!\n\n";
cout << "Enter a number, press \"Enter\", then enter another. Push \"Enter\" when you are finished: \n";
cin >> a;
cout << "(divided by) \n";
cin >> b;
c=Div(a,b);
cout << "Your answer is: " << c << endl << endl;
}
if (Choice > 4) {
cout << "That doesn't work.\n\n\n";
Calc();
}
if (Choice < 1) {
cout << "That doesn't work.\n\n\n";
Calc();
}
system("PAUSE");
return 0;
}
//---------------------------------------------------------------------------
|
It works.
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Hackerdevelopment
Advanced Cheater
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Posts: 55
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| Posted: Fri Nov 09, 2007 8:15 pm Post subject: |
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Wow! It must b hard to make a calculator.
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atom0s
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Posts: 8587
Location: 127.0.0.1
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| Posted: Fri Nov 09, 2007 8:18 pm Post subject: |
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| M3KillU wrote: | I'm still learning C++
I just thought there would be an easier way to call... oh well... Looks like it's back to the book (Sam's Teach Yourself C++ in 21 Days)
EDIT:
I made another script.
|
Just a note, you name your parameters in sequential order like it's needed to be like that. Meaning you have things like:
| Code: | int Add(int num1, int num2){...}
int Sub(int num3, int num4){...} |
You don't need to name them like 1 2 3 4 and so on. A parameter is function wide only. Only that function has access to that parameter.
You can safely setup your functions like:
| Code: | int Add(int num1, int num2){...}
int Sub(int num1, int num2){...} |
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M3KillU
Grandmaster Cheater
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Posts: 793
Location: California, USA
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| Posted: Tue Nov 13, 2007 5:03 pm Post subject: |
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Oh, that is sweet! I thought I would have some lame error if I tried that. Thanks for the info.
| Hackerdevelopment wrote: | | Wow! It must b hard to make a calculator. |
It's not that hard. Just took a little bit of if comparisons, and some basic C++ knowledge. This is in command prompt... I want to make an actual window, but, I don't have enough knowledge for that, I also don't know how to program the buttons that you can make in the compiler I have.
Thanks for the help everyone
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TheSorc3r3r
I post too much
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Posts: 2404
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| Posted: Tue Nov 13, 2007 8:25 pm Post subject: |
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Umm.. if you want to call main:
main();
Lol
btw, if you want to program GUIs, look at www.functionx.com/win32
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