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See more: VS2008 Visual-Studio
Hello there :)
how can i solve this error:
fatal error LNK1561: entry point must be defined
and i need a grant visual studio 2008 professional edittion please :)
Posted 5-Apr-13 5:11am
Comments
   
Language? Application type?
—SA
Richard MacCutchan 5-Apr-13 10:18am
   
Difficult to tell why you get the Link error; you probably forgot to add a public main() function in your code. However, since you have not told us what language you are using that is just a guess. The last part of your question makes no sense; what do you mean by "grant"?
Manar aysar 5-Apr-13 10:51am
   
sorry for being late :)
im using vc++ ,,for my graduation project
when iam using this code
#include"stdafx.h"
#include"omp.h"
#include"iostream"
using namespace std;
int main()
{
int **a,**b,**c; // variables to store allocated memory
int a_r,a_c,b_r,b_c, nthreads, tid, chunk =10; //variables to input matrix
//size and variables to be used by OpenMP functions
double dif,st,et; //variable to calculate the time difference between the parallelization
int i,j,n,m; // variables to be used in for loops to
//generate matrices
cout<<"\nenter rows and columns for the matrix:";
cin>>a_r>>a_c;
cout<<"\nenter rows and columns for the mask :";
cin>>b_r>>b_c;
/* allocate memory for matrix one */
a=(int **) malloc(10*a_r);
for( i=0;i<a_c; i++)="" {="" a[i]="(int" *)="" malloc(10*a_c);="" }="" *="" allocate="" memory="" for="" matrix="" two="" b="(int" **)="" malloc(10*b_r);="" for(="" i="0;i<b_c;" b[i]="(int" malloc(10*b_c);="" sum="" c="(int" malloc(10*a_r);="" a_c;="" c[i]="(int" cout&lt;&lt;"enter="" the="" index="" of="" center="" mask="" :"&lt;&lt;endl;="" cin="">>n;
cin>>m;

#pragma omp parallel num_threads(1) shared(a,b,c,nthreads,chunk) private(tid,i,j)
{
tid = omp_get_thread_num();
if (tid == 0)
{
nthreads = omp_get_num_threads();
cout<<"Starting matrix multiple example with "<<nthreads<<"threads";
}
st =omp_get_wtime();
//initializing first matrix
#pragma omp for schedule (static, chunk)
for(i=0;i<a_r; i++)="" {="" for(j="0;j<a_c;" j++)="" a[i][j]="i+j;" }="" initializing="" second="" matrix="" #pragma="" omp="" for="" schedule="" (static,="" chunk)="" for(i="0;i<b_r;" b[i][j]="i*j;" *initialize="" product="" *="" b_c;="" c[i][j]="0;" printf("thread="%d" did="" row="%d\n",tid,i);" if(i-1="">=0&&j-1>=0)
c[i][j]=c[i][j]+a[i-1][j-1]*b[n-1][m-1];

if(i+1<a_r&&j+1<a_c) c[i][j]="c[i][j]+a[i+1][j+1]*b[n+1][m+1];" if(i-1="">=0)
c[i][j]=c[i][j]+a[i-1][j]*b[n-1][m];

if(i+1<a_r) c[i][j]="c[i][j]+a[i+1][j]*b[n+1][m];" if(i+1<a_r&&j-1="">=0)
c[i][j]=c[i][j]+a[i+1][j-1]*b[n+1][m-1];

if(i-1>=0&&j+1<a_c) c[i][j]="c[i][j]+a[i-1][j+1]*b[n-1][m+1];" if(j-1="">=0)
c[i][j]=c[i][j]+a[i][j-1]*b[n][m-1];

if(j+1<a_c) c[i][j]="c[i][j]+a[i][j+1]*b[n][m+1];" }="" *****end="" of="" parallel="" region*****="" cout&lt;&lt;"******************************************************\n";="" cout&lt;&lt;"done.\n";="" et="omp_get_wtime();" dif="et-st;" cout&lt;&lt;"parallelization="" took="" "&lt;&lt;dif&lt;&lt;"sec.="" time.\n";="" *free="" memory*="" for(i="0;i<a_r;" i++)="" {="" free(a[i]);="" free(a);="" free(b[i]);="" free(b);="" free(c[i]);="" free(c);="" int="" kkk;cin="">>kkk;



return 0;
}
i think i have aproblem in visual studio installation??what do you think
Manar aysar 5-Apr-13 10:53am
   
error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
fatal error LNK1120: 1 unresolved externals
how can solve them ,,plz help me!!
CPallini 5-Apr-13 11:07am
   
What kind of project did you choose on Visual Studio 2008? You should select 'Console Application'.
Manar aysar 5-Apr-13 11:10am
   
yes i choose console app. and give me this errors :
error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
fatal error LNK1120: 1 unresolved externals
how can i solve them ?

1 solution

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Solution 1

It means that the assembly or executable module being built on your project is supposed to be an application, which always requires the definition of the entry point, a function to be called when the application is loaded. By some reason, it is missing.

Please see: http://en.wikipedia.org/wiki/Main_function[^].

You need to tag appropriate classifiers of your project when asking questions, such as platform, language, application type and other relevant detail.

—SA
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