Thread: 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

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

first of all use code tags to post code {code} //some code {/code}
but instead of {} use [ & ]

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

why is that italicised?

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; 
}

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();

thank you all i finally got this to work