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what does the error mean? how can i fix my code?

 
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what does the error mean? how can i fix my code?
shahnozajon
17 Apr, 2007 - 09:10 AM
Post #1

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Joined: 9 Apr, 2007
Posts: 13


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CODE
#include <iostream>
#include <cstdlib>
using namespace std;

int binarySearch (int searchValue, const int a[], int n)
{
    int low;
    int high;
    int mid;
    low = 0;
    high = n - 1;
    while (low <= high)
    {
          mid = (low + high) / 2;
          if (searchValue == a[mid])
              return mid;
          else if (searchValue < a[mid])
              high = mid - 1;
          else
              low = mid + 1;
    }
    return -1;
}



my error says: [Linker Error] undefined reference to 'WinMain@16'
what is wrong with the code?
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Amadeus
RE: What Does The Error Mean? How Can I Fix My Code?
17 Apr, 2007 - 09:12 AM
Post #2

g++ -o drink whiskey.cpp
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You don't have a main function the program can use as an entry point.
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shahnozajon
RE: What Does The Error Mean? How Can I Fix My Code?
17 Apr, 2007 - 09:23 AM
Post #3

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QUOTE(Amadeus @ 17 Apr, 2007 - 10:12 AM) *

You don't have a main function the program can use as an entry point.


CODE

#include <iostream>
#include <cstdlib>
using namespace std;

int main {}
{
    int low;
    //int high;
    int mid;
    int n;
    int low = 0;
    int high = n - 1;
}

int binarySearch (int searchValue, const int a[], int n)
{
    while (low <= high)
    {
          mid = (low + high) / 2;
          if (searchValue == a[mid])
              return mid;
          else if (searchValue < a[mid])
              high = mid - 1;
          else
              low = mid + 1;
    }
    return -1;
}


i added the main function. i dunno if i completely messed it up but now it's giving me a parse error and a syntax error.
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Amadeus
RE: What Does The Error Mean? How Can I Fix My Code?
17 Apr, 2007 - 09:36 AM
Post #4

g++ -o drink whiskey.cpp
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Fixed syntax errors only (with a few notes on other matters):
CODE

#include <iostream>
#include <cstdlib>
using namespace std;

int binarySearch (int searchValue, const int a[], int n);

int main()
{
    int mid;
    int n;
    int low = 0;
    int high = n - 1;//n does not have a value yet...this will create an error
    return 0;
}

int binarySearch (int searchValue, const int a[], int n)
{
    while (low <= high)//this function cannot see mid, low, or high unless they are declared in it's scope, or are global, or are passed to it.
    {
          mid = (low + high) / 2;
          if (searchValue == a[mid])
              return mid;
          else if (searchValue < a[mid])
              high = mid - 1;
          else
              low = mid + 1;
    }
    return -1;//you probably want to return mid here.
}
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shahnozajon
RE: What Does The Error Mean? How Can I Fix My Code?
17 Apr, 2007 - 10:21 AM
Post #5

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QUOTE(Amadeus @ 17 Apr, 2007 - 10:36 AM) *

Fixed syntax errors only (with a few notes on other matters):
CODE

#include <iostream>
#include <cstdlib>
using namespace std;

int binarySearch (int searchValue, const int a[], int n);

int main()
{
    int mid;
    int n;
    int low = 0;
    int high = n - 1;//n does not have a value yet...this will create an error
    return 0;
}

int binarySearch (int searchValue, const int a[], int n)
{
    while (low <= high)//this function cannot see mid, low, or high unless they are declared in it's scope, or are global, or are passed to it.
    {
          mid = (low + high) / 2;
          if (searchValue == a[mid])
              return mid;
          else if (searchValue < a[mid])
              high = mid - 1;
          else
              low = mid + 1;
    }
    return -1;//you probably want to return mid here.
}



thanx for the help!
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