While loop with array

Assuming that arr is an array containing 100 elements I need to write the equivalent while loop that corresponds to the following for loop.

Code:

for ( i=0, s=0.0;i<100;s=s+arr[ i ], i++) ;

Here what I have done:

Code:

#include <stdio.h>


int main()
{
int s;
int i;

s = 0.0;
i = 0;

while ( i<100 ){ 
printf( "%d \n", i = i++ );
s = s+arr[i];
}

return 0;
}

But how do i declare the array?

Errors recieved :

xc.c(14) : error C2065: 'arr' : undeclared identifier
xc.c(14) : error C2109: subscript requires array or pointer type

I doubt that I have to use define SIZE.

Thanks

How do you not declare it? You must have created something that you can manipulate in the first place. The first code just does not show where.

Code:

int arr[100];

Thanks guys....problem solved