CODEWITHSUNDEEP
c++iosxcodemacos
UserYmY
UserYmY

Reputation: 8554

c++ Mac Xcode: Undefined symbols for architecture x86_64:

I am running the following code in c++ in Xcode on Mac 

int fibo(int x)
{
      if (x==1||x==2)
          return 1;
          else
              return fibo(x-1)+fibo(x-2);
}

and receiving this error cannot know why.

undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Can somebody help me with?

Upvotes: 1

Views: 564

Answers (2)

farcost
farcost

Reputation: 163

You should to implement main() function.

The main function is called at program startup after initialization of the non-local objects with static storage duration. It is the designated entry point to a program that is executed in hosted environment (that is, with an operating system). The entry points to freestanding programs (boot loaders, OS kernels, etc) are implementation-defined. http://en.cppreference.com/w/cpp/language/main_function

#include <iostream> // for std::cout
int fibo(int x)
{
      if (x==1||x==2)
          return 1;
          else
              return fibo(x-1)+fibo(x-2);
}

int main() 
{
      int x = 1;
      int result = fibo(x);
      std::cout << "Result: " << x; // Printing result
      return 0;
}

Upvotes: 0

Anon Mail
Anon Mail

Reputation: 4770

You need to define a main function. That's first function that gets called to "start" your program.

Add this to your file:

int main()
{
    fibo(10);  // calls your function with
}

Upvotes: 1

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