Adding values from 1dimensional array

[iamjd]

#include<stdafx.h>

int main()
{
int isbn[10];
int isbnSum;
int i;

for (i=1;i<=10;i++)
{
printf("Enter digit # %d of isbn number.\n", i);
scanf("%d", &isbn);
}

for (i=1;i<=10;i++)
{
isbnSum += isbn;
}

printf("Sum: %d\n", isbnSum);
return 0;
}

Each time i run this program I get some really weird number, almost like an integral memory address location. I want it to add all of the values that belong to the array from array position 1 to 10. I can't spot an error in my code, but it is clear that there must be if i'm not getting the value I should get.

What am I doing wrong?

 

[xwb]

If you declare an array of size 10, the indices go from 0 to 9.

    for (i=[COLOR=red]0[/color];i[COLOR=red]<[/color]10;i++)

 

[iamjd]

I am still getting a negative answer, something like -8273464. The code I am using is below:

#include <stdafx.h>

int main()
{
	int isbn[10];
	int isbnSum;
	int i;

	for (i=0;i<10;i++)
	{
		printf("Enter digit # %d of isbn number.\n", i + 1);
		scanf("%d", &isbn[i]);
	}

	for (i=0;i<10;i++)
	{	
		isbnSum += isbn[i];
	}

	printf("Sum: %d\n", isbnSum);
	return 0;
}

 

[olded]

Hi:

Try initializing you sum variable:

int isbnSum=0;

 

[iamjd]

yes. initializing my sum variable did the trick! Also starting my index from 0 to 9 worked as well. since arrays start from 0 i assume?

 

[xwb]

Yes - arrays begin at 0.