some question asking for answer...

This is a discussion on some question asking for answer... within the C++ Programming forums, part of the General Programming Boards category; hi, I'm not "old" in this stuff c++ but, I got some problems. first. how do I execute 1 of ...

  1. #1
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    Talking some question asking for answer...

    hi, I'm not "old" in this stuff c++ but, I got some problems.
    first. how do I execute 1 of the files in 1 project. 1 is int main() and 1 is int submain() so how do I execute only the int submain()?

    2nd.What pointers and structures are meant for?

    3rd.

  2. #2
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    oh and y does this:
    Code:
     #include <iostream>
    
    using namespace std;
    
    int main()
    {
      int x;
      int y;
      int array[8][8]; // Declares an array like a chessboard
      
      for ( x = 0; x < 8; x++ ) {
        for ( y = 0; y < 8; y++ )
          array[x][y] = x * y; // Set each element to a value
      }
      cout<<"Array Indices:\n";
      for ( x = 0; x < 8;x++ ) {
        for ( y = 0; y < 8; y++ )
          cout<<"["<<x<<"]["<<y<<"]="<< array[x][y];
    	cout<<"\n";
      }
      cin.get();
    }
    different of this:
    Code:
     #include <iostream>
    
    using namespace std;
    
    int main()
    {
      int x;
      int y;
      int array[8][8]; // Declares an array like a chessboard
      
      for ( x = 0; x < 8; x++ ) {
        for ( y = 0; y < 8; y++ )
          array[x][y] = x * y; // Set each element to a value
      }
      cout<<"Array Indices:\n";
      for ( x = 0; x < 8;x++ ) {
        for ( y = 0; y < 8; y++ )
          cout<<"["<<x<<"]["<<y<<"]="<< array[x][y]"\n";
      }
      cin.get();
    }
    Note the cout<<"\n";
    and the cout<<"["<<x<<"]["<<y<<"]="<< array[x][y]"\n";

    the first 1, when they're separated, it shows the results clearly and 'endl' only after a whole [8] array only then it ends the line, but the 2nd ends the line every result. (indices).

  3. #3
    CSharpener vart's Avatar
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    this

    array[x][y]"\n";

    should not compile...
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  4. #4
    The larch
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    You already asked the first question. If the answers were not good enough, may-be you should provide more information, for example show the code.

    The second question is a bit too open-ended. It almost sounds like 'I've heard there are pointers and structs, should I bother to learn what they are?' Yes, you should and in the course you would probably find out yourself what they are good for.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  5. #5
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    ok cool anyway heres the code of the 2 file 1 project:
    Code:
     #include <iostream>
    
    using namespace std;
    
    int main()
    { char act;
    
    	do {
    	cout<<"Please choose 1 of a mathematic actions. For multiplying press m, divide - d, add - a, and less - l ";
    	cin>> act;
    	int num, num1;
    	switch (act) {
    		case 'm':
    	cout<<"Input 2 numbers to be multiplied(press enter after u choose the one and after the another) \n";
    	cin>> num;
    	cin.ignore();
    	cout<<" x \n";
    	cout<< endl;
    	cin>> num1;
    	cin.ignore();
    	cout<<"= "<< num * num1;
    	cin.get();
    	break;
    	return 0;
    		case 'd':
    			cout<<"Input 2 numbers to be divide\n";cin.ignore();
    			cin>> num; cin.ignore(); 
    			cout<<" : "; 
    			cin>> num1; 
    			cin.ignore();
    			cout<<" = "<< num / num1;
    			cin.get();
    			break;
    			return 0;
    		case 'a':
    			cout<<"Input 2 numbers u choose to add to each one\n";
    			cin>> num; cin.ignore(); cout<<" + "; cin>> num1;
    			cin.ignore();
    			cout<<" = "<< num + num1;
    			break;
    			return 0;
    			cin.get();
    		case 'l':
    			cout<<"Input 2 numbers to calculate the first minus the 2nd \n";
    				cin>> num;
    			cin.ignore();
    			cout<<" - ";
    			cin>> num1;
    			cin.ignore();
    			cout<<" = ";
    			cin.ignore();
    			cout<<num - num1;
    			cin.get();
    			return 0;
    	} 
    	} while(!(act == 'm' || act == 'd' || act == 'a' || act == 'l'));
    }
    this was my first 1, with the int main() now heres the 2nd:
    Code:
     #include <iostream>
    
    using namespace std;
    
    int submain()
    {
    
      int x;            // A normal integer
      int *p;           // A pointer to an integer
      p = &x;           // Read it, "assign the address of x to p"
      cin>> x;          // Put a value in x, we could also use *p here
      cin.ignore();
      cout<< *p <<"\n"; // Note the use of the * to get the value
      cin.get();
      return 0;
    
    }
    Last edited by mat13mat; 04-30-2008 at 03:22 AM.

  6. #6
    The larch
    Join Date
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    These are two separate programs? May-be it seems to you like one project but if both files are not part of the same program it is not the same project.

    Replace submain with main and compile it as a separate program/project?
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  7. #7
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    oh another thing is: when I execute a file or a project, I think it might build everything then run the .exe file, now the .exe file suppose to be saved somewhere, where is it? I use microsoft visual c++ 2008, I open my documents, visual c++ 2008\projects\"the name of my project"\Debug\ <-- there I think the file suppose to be, and I cant find it, all I see is .res things, . pdb(project debug base)... but no .exe. helpppp

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