-858993460 Value when use prinft, please help

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December 12th, 2012, 03:21 PM

Bloodyred

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-858993460 Value when use prinft, please help

Hi, i'm starting with my course of Structured programming and i'm programming in C, so, here i am in Microsoft Visual C++ 2010 making this program of print an array of 20 numbers in order and backwards, but when the backward array is printed it shows "-858993460" in the first value and i don't know why the program do this, i would like you to help me to solve this and a little explanation of why and what can i do for avoid it in the future.

Here is the code and the result:

Code:

#include <stdio.h>
#include <conio.h>

int main()
{
	
	int Items[20];
	int i;
	puts("introduce 20 numbers, followed by return");

	for (i=0; i<20; i++)
		scanf("%d", &Items[i]);
	
	for (i=0; i<20; i++)
	printf("%d ",Items[i]);
	printf("\n");
	
	for (i=20; i>0; i--)
	printf("%d ",Items[i]);
	
	getchar();
	getchar();
	return 0;
}

and here is the result

Photo Result

EDIT: I don't know why the photo of the results is not showing but it's something like

Code:

Introduce 20 numbers followed by return
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
-858993460 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5  4 3 2

debugged in cmd

December 12th, 2012, 03:39 PM

salem

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> for (i=20; i>0; i--)
This should be
for (i=19; i>=0; i--)

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December 12th, 2012, 08:32 PM

Bloodyred

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Quote:

Originally Posted by salem

> for (i=20; i>0; i--)
This should be
for (i=19; i>=0; i--)

Thanks so much, that work perfectly!
Now if it is not too much to ask i would to know, the reason why is that serie of number showing and why is diferent

Code:

(i=19; i>=0; i--)

from

Code:

(i=20; i>0; i--)

December 13th, 2012, 12:47 AM

salem

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Rather than printing Items[i], why not just print i instead.

-858993460 Value when use prinft, please help

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