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Old 08-20-2003, 08:10 AM   #1
Registered: May 2002
Distribution: Mandrake 10.0
Posts: 78

Rep: Reputation: 15
Question C++ Six Element Array

In the following code I don't understand why the variable index is needed. Also in the 'for loop' when the array is ouputed to the vdu via cout, why does it need to be 'number[index].'

#include <iostream.h>

int number[6]; // an array of integers
int index;

number[5] = 42; //initialize the arrray
number[4] = 2001;
number[3] = 7;
number[2] = 180;l
number[1] = 99;
number[0] = 1993;

for (index = 0; index <= 5; index++)
cout << number[index] << endl;

Thanks in advance my book didn't explain this section of code.
Old 08-20-2003, 08:31 AM   #2
Registered: Aug 2003
Location: Belgium
Distribution: Debian (server), Kubuntu (desktop)
Posts: 248

Rep: Reputation: 30
I'll try to explain it step by step:

index = 0: sets the index variable to 0 (duh)
index <= 5: as long as this condition is met, the for loop will be executed
index ++: after each loop, the index variable is increased by 1

number[index] is the location location in the number array, so when index = 0, number[index] = 1993, when index = 1, number[index] = 99 and so on.

cout << number[index] << endl

will print the content of the array at the location of index to the screen and it will do this as long as index <= 5.
The endl is a newline so that the next element will be printed on a new line.

I hope this explains things to you...
Old 08-20-2003, 11:08 AM   #3
Registered: May 2002
Distribution: Mandrake 10.0
Posts: 78

Original Poster
Rep: Reputation: 15
Talking Ty!

Thanks I understand now!


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