Why the output of the program is 3323321? What does return function does in function abc?

Question

1.00/5 (2 votes)

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C++

#include<stdio.h>
void abc(char*s)
{

if(s[0]=='\0')
    return;
abc(s+1);
abc(s+1);
printf("%c",s[0]);
}
int main()
{
    abc("123");
}

What I have tried:

i have tried recursions for the execution of function abc(char *s).

Posted 23-Mar-17 6:57am

Member 13057504

Updated 23-Mar-17 8:35am

Bryian Tan

v2

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[no name] 23-Mar-17 13:34pm

Learn how to use the debugger to step through your code.

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Patrice T · Answer 1 · 2017-03-23T08:35:00

Quote:
Why the output of the program is 3323321? What does return function does in function abc?

That is what you asked for.

When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute, it is an incredible learning tool.

Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.