While loop with array

This is a discussion on While loop with array within the C Programming forums, part of the General Programming Boards category; Assuming that arr is an array containing 100 elements I need to write the equivalent while loop that corresponds to ...

  1. #1
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    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

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
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    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.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  3. #3
    spurious conceit MK27's Avatar
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    segmentation fault
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    Code:
    int arr[100];
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  4. #4
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    Wink

    Thanks guys....problem solved

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