C++ - struct errors

Question

Following an example at: http://www.learncpp.com/cpp-tutorial/47-structs/ relating to structs , and when I tried to compile this program:

#include <iostream>
void PrintInformation(Employee sEmployee)
{
std::cout<<"ID: "<<sEmployee.nID<<std::endl;
std::cout<<"Age: "<<sEmployee.nAge<<std::endl;
std::cout<<"Wage: "<<sEmployee.fWage<<std::endl;
}

struct Employee {int nID;int nAge;float fWage;};

int main()
{
Employee abc;
abc.nID=123;
abc.nAge=27;
abc.fWage=400;
// print abc's information
PrintInformation(abc);
return 0;
}

I get the following:

Why is that?

Thanks.

Answer 1

You need to declare the struct before the function that attempts to use it.

C (and by extension, C++) were designed for "single-pass" compilation. Therefore, everything must be available to the compiler by the time it's required.