ascending triangles

This is a discussion on ascending triangles within the C++ Programming forums, part of the General Programming Boards category; i need to make a triangle like this ____* ___** __*** _**** ***** _ indicates spaces heres what i have ...

  1. #1
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    ascending triangles

    i need to make a triangle like this
    ____*
    ___**
    __***
    _****
    *****
    _ indicates spaces
    heres what i have so far...when i compile it all it does is end the program...im quite stuck...im new to the programming thing..so any help will be appreicated
    #include <iostream>
    using namespace std;
    int main ()
    {
    int lines;
    int spaces;
    int dots ;
    cout << "How many lines do you want in the picture?\n";
    cin >> lines;
    for ( lines = 1; lines == 0; lines++){
    for (spaces = lines - 1; spaces <= 0; spaces-- ){
    cout << "_";
    for (dots = 1; dots <= lines; dots++ ){
    cout << '*';}
    cout << endl;}}
    return 0; }

    thank you

  2. #2
    Registered User axon's Avatar
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    welcome to the boards, please read the rules and use code tags to format your code.

    your most evident problem lies in the first for loop:
    Code:
    for ( lines = 1; lines == 0; lines++)
    you are increasing 1 each time through the loop starting at 1, you will never get to 0....

    some entropy with that sink? entropysink.com

    there are two cardinal sins from which all others spring: Impatience and Laziness. - franz kafka

  3. #3
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    Code:
    #include <iostream>
    using namespace std;
    int main ()
    {
    int lines;
    int spaces;
    int dots ;
    cout << "How many lines do you want in the picture?\n";
    cin >> lines;
    for ( lines ; lines == 0; lines--){
    	for (spaces = lines - 1; spaces <= 0; spaces-- ){
    	cout << "_";
    	for (dots = 1; dots <= lines; dots++ ){
    	cout << '*';}
    	cout << endl;}}
    return 0; }
    so i change that much and i need to use user in put for how many lines...but im not sure what is wrong with the code...no errors just wont do anything

  4. #4
    SleepWalker tjohnsson's Avatar
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    Code:
    #include <iostream>
    
    using std::cout;
    using std::endl;
    
    int
    main ( void ) {
       int asterixes = 1;
       int spaces = 5;
         
       while( spaces - asterixes > -1 ) {     
         for ( int i = 0; i < spaces - asterixes; ++i ) {
              cout << " ";
         }
         for ( int j = 0; j < asterixes; ++j ) {
              cout << "*";
         }   
         ++asterixes;
         cout << endl;
      }    
    }
    Maybe you can fix this to fit in your practice....
    -- Add Your Signature Here --

  5. #5
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    first of all use code tags to post code {code} //some code {/code}
    but instead of {} use [ & ]
    Quote Originally Posted by bluegoo06
    #include <iostream>
    using namespace std;
    int main ()
    {
    int lines;
    int spaces;
    int dots ;
    cout << "How many lines do you want in the picture?\n";
    cin >> lines;
    for ( lines = 1; lines == 0; lines++)
    {
    for (spaces = lines - 1; spaces <= 0; spaces-- )
    {
    cout << "_";
    for (dots = 1; dots <= lines; dots++ )
    {
    cout << '*';
    }
    cout << endl;
    }
    }
    return 0;
    }
    after you get the amount of lines you want from cin, don't change it. create a new int named 'i'. do for(i = 1; i <= lines; i++){}...
    your login for printing '_' and '*' is off....think about when and how many '_'s you need to print, and then when and how many '*'s to print

  6. #6
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    why is that italicised?

  7. #7
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    I try to edit it , although it's can running correctly now,
    but I am donn't master loop condition set like this ,
    somegurus, please give me some suggestion about
    Code:
    for(?;? ;?;){for(?;?;?).......}
    or give me some website contains some test like this.
    Thanks.


    Code:
    #include <iostream>
    using namespace std;
    
    int main ()
    {
        int lines;
        int spaces;
        int dots ;
        
        cout << "How many lines do you want in the picture?\n";
        cin >> lines;
        for (int n = 1; n < lines; n++)
        {
            for (spaces = n; spaces < lines ; spaces++ )  //this is my guss setting , not know why and how?
            {
                   cout << "_";
            }    
            for (dots = 1; dots < n+1; dots++ )
            {
                   cout << "*";
            }//end for dots
             cout << endl;
        }//end for lines
    
        system("pause");
        return 0; 
    }

  8. #8
    unleashed alphaoide's Avatar
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    Code:
    for (int n = 1; n < lines; n++)
    above is similar to
    Code:
    int n = 1;
    while ( n < lines ) {
        // do something
    
        n++;
    }
    source: compsci textbooks, cboard.cprogramming.com, world wide web, common sense

  9. #9
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    for(initialize a variable (first time thru loop only) ; while a condition return true; change condition)

    for(i = 0; i <= x; i++) <<----- your basic for loop
    for loops are most commonly used when you know the number of times you want to go thru the loop. it says do the loop while i is less than or equal to x. after one iteration, make i closer to x. (assuming x > 0); master that and then try changing the statements in the for();

  10. #10
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    thank you all i finally got this to work

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