Question

I am new to Visual Studio. I’m trying to run Hello World, but am getting several errors and cannot figure out what the problem is.
I typed:

#include<stdio.h>

main()
{
    printf("Hello World");


}

---

into a code file with .c extension. I get this:

Error   1   error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup   
d:\Users\...\MSVCRTD.lib(crtexe.obj)    Project

Error   2   error LNK1120: 1 unresolved externals   
d:\users\...Project.exe 1   1   Project

Anyone know what the problem is?
Thanks.

Answer 1

It compiles fine… you need to set it to compile as C code:

Project->Properties->Advanced->Compile As C Code (/TC flag)

#include<stdio.h>

main()
{
    printf("Hello World");


}

Output:

1>------ Build started: Project: main,
Configuration: Debug Win32 ------
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped
==========

Reason:

You are compiling as C code and therefore default int is not assumed in C++ code

Update:

As mentioned by Michael Burr your code should use a *.c extension. However, it will still compile cpp files as c code if you set the project properties. However, if no setting is provided it will compile with the default settings (*.c -> c code) and (*.cpp -> cpp code).

Compiled as C code with CPP extension (successful)

1>------ Build started: Project: main, Configuration: Debug Win32 ------
1>  main.cpp
1>  main.vcxproj -> c:\users\shane\documents\visual studio 2010\Projects\main\Debug\main.exe
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

Compiled as CPP code with C Extension (failed)

1>------ Build started: Project: main, Configuration: Debug Win32 ------
1>  main.c
1>c:\users\shane\documents\visual studio 2010\projects\main\main\main.c(4): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========