I am beginner for C++ and confused with the output.

Question

Why is the output 01234 instead of 43210?

#include <iostream>
using namespace std;
void func(int x){
if(x>0){
func(--x);
cout<<x;
}
else
return;

}
int main() {
func(5);
return 0;
}

Answer 1

Marven Mendoza just change two lines in func as below and output will change:

cout << x; //first print value of x
func(--x); // after printing value 5 first on cout, again function is called for 4 and so on....

Now coming to original code having output as 01234...Refer below:

From main, func is called and x is 5... in func x is more than 0 so, again func is called with 4 (--x)..Note that yet cout << x is not executed for func() with x=5 and func for x=4 is called..so, all this function call happens till x is 1... Now, first x is 0 executed for cout and at last x as 4..so, output is 01234

feel free to ask if you have any query

Answer 2

that is kept in stack by compiler.. for example, in five line of code, compiler do not go to line 3 till the line 2 is not fully executed....

Answer 3

https://code.sololearn.com/c1a9mxjvK8la/?ref=app

Answer 4

Ketan Lalcheta, I have a question, how something is printed in the code that he mentioned in his post. I mean, in if statement func is called first before cout and how still cout is executed,