I need to print this triangle:
* ** *** **** ***** ****** ******* ******** using a FOR and WHILE loop. I need help, I have already figured out the for loop version I just have to convert it to while loop but everything I try is not giving me the correct output! Any help is appreciated!
My code so far:
#include <iostream> using namespace std; int main(int argc, char**argv) { int i = 1; int j = 1; int N = 8; while (i <= N) { i = i++; while(j <= i) { cout<<"*"; j = j++; } cout<<endl; } } I'll give you a hint (in the interest of making you do some figuring out yourself): You're forgetting to set j back to 1 after the inner loop.
As it is now, when j gets to be <= i once, it stays that way and the inner loop is never entered again.
Also, while it's not directly related to your question, make sure never to do j = j++ or i = i++; just do j++ and i++ (as Kshitij Mehta said in the comments). If you're interested in why, you can read this question and its answers.
What are the rules?
while (1) { cout << "*" << '\n'; cout << "**" << '\n'; cout << "***" << '\n'; cout << "****" << '\n'; cout << "*****" << '\n'; cout << "******" << '\n'; cout << "*******" << '\n'; cout << "********" << '\n'; break; } I'll give you a hint as well: i = i++; doesn't do what you think it does.
I don't really know how to make it more succinct than this:
#include <iostream> #include <sstream> int main() { std::stringstream ss; int i = 10; while (i--) std::cout << (ss<<'*', ss).str() << std::endl; } or as for loop, cutting down a line
for(int i=10; i--;) std::cout << (ss<<'*', ss).str() << std::endl; If you don't mind some less efficient code:
#include <iostream> int main() { for(int i=1; i<10; std::cout << std::string(i++, '*') << std::endl); } I can't see your triangle, but I think you need to set j to 1 before each loop on j:
while (i <= N) { i++; j = 1; while(j <= i) { cout<<"*"; j++; } cout<<endl; } 
i=i++ statements like the others said (I copy/pasted your code without paying attention).#include <iostream> using namespace std; int main() { int i, j, N=7; while(i <= N) { i++; j = 1; while(j <= i) { cout << "*"; j++; } cout << endl; } } 
i = i++andj = j++. justi++andj++will do the trick.j = j++says "incrementj, then assignjthe value it had before incrementing it." Probably not what you want.