explaination of code

hi everyone

this is the code i dont understand and the output is 24.... so can someone show me working and example of the process..thank you

Code:

#include <iostream>
#include <cstdlib>
using namespace std;


int main()
{
const int MAX = 6;
int arr[MAX];
int count;
int temp;
for(count = 0; count<MAX; count++)
arr[count] = count+1;
for(count = 0; count<(MAX/2); count++)
{
temp = arr[count];
arr[count] = arr[MAX - (count + 1)];
arr[MAX - (count + 1)] = temp;
}
for(count = 0; count<MAX ; count++)
temp = temp + arr[count];
cout<<temp<<" ";
system("pause");
return 0;
}//end main

67 posts and no ever told you to indent your code properly?

so can someone show me working and example of the process..thank you

Get a pencil and paper. Across the top of the paper write the headings:

Code:

MAX    count    temp   arr[MAX]: arr[0]  arr[1]..  .arr[MAX-1]

Then, step through the code and write down the corresponding values under the headings. When a variable is assigned a new value, cross out the old value and write down the new value underneath it.

The beauty of programming is just like any spoken language, if you learn the vocabulary and grammar syntax, you can read through it character by character, line by line.

'sept there is alot more skipping around.... ok maybe this is somewhat untrue, but in the case of your code, it is.

Perhaps learning to indent code would help you understand what bits of code get executed inside which loops.

If you use a Microsoft Compiler, it indents for you. In the case of Dev C++, the older versions especialy, it has no identation help at all.

A good example of good indent is as follows:

Code:

#include <iostream>

using std::cout;
using std::endl;

// main function

int _tmain(int argc, _TCHAR* argv[])
{
	// declare two integer variables using one line

	int length, height;

	// assign lengh and height values

	height = 7;
	length = 10;

	// display result to screen by multiplying the variables after the cout statement

	cout << "Total area is: " << length * height << endl;

	getchar();	// freeze output

	return 0;	// indicate sucsessful termination
}

You should place a breakpoint in your code then step through it one step at a time and see which variables get which value on the bottom, or at least Visual Studio does it.

Originally Posted by swgh

If you use a Microsoft Compiler, it indents for you. In the case of Dev C++, the older versions especialy, it has no identation help at all.

No, that's the editor that's doing the indentation.
C++ compilers (like all compilers except Python AFAIK) actually remove all indentation and other formating

What I would do (and do do when debugging code that isn't responding how I would like it) is cout all the variables as they are modified. Add a cout at the start, then right after when ever anything is changed, that way you can see how the numbers are changing... one thing to remember is to show the names too like

Code:

cout<<"var count: " << count << endl;

but that is just my suggestion.