In the below code I defined both n and k initially and then if I define n as k/2 after I take k as input using cin, the code is successful but instead of this if I define n=k/2 before cin function I get an infinite loop as output? Please tell why is defining below or after cin function is affecting the output.
#include <iostream>
using namespace std;
int main () {
cout<< "how many asterisks you want in the middle column:";
int n,k;
// n=k/2 ;
cin>>k;
// n=k/2;
//some code involving n
return 0;
}
>Solution :
The order of statements makes a difference:
int k = 2;
int n = k/2;
k = 4;
is different than
int k = 2;
k = 4;
int n = k/2;
In the first case, you get n = 1, and in the second n = 2. This really shouldn’t surprise you! You might need to revise your programming basics before dealing with loops if it does 🙂
Other things:
- never use
using namespace std;. Not doing that, but specifically only importing the things you need will save you a lot of time later on, debugging very strange problems (I don’t know why this is still taught):using std::cin;,using std::cout;is maybe longer, but much better, because you know what you get in your name space! - Properly indent your code. Yes, your editor has a function for that, and if it hasn’t, get a better editor (these things really make a difference, especially for a beginner, because they help you spot little typos much easier!). Many beginners like Code::blocks as editor, because it’s easy to set up and good, others like the more mightier VS Code.