ch3-Forward declarations, extern and static conflicting specifiers

Chapter_3     Exercise_3-10

Constants_in_C     Exercise_3-11

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Forward.cpp     TCP1, p. 163-164         download

// Forward function & data declarations
#include <iostream>
using std::cout;
using std::endl;

// This is not actually external, but the
// compiler must be told it exists somewhere:
extern int i; // data declaration, not definition
extern int i; // can be declared multiple times
// extern static int i; // compile error: conflicting specifiers
extern void func(); // function declaration
extern void func(); // can be declared multiple times
// extern static void func(); // compile error: conflicting specifiers

int main()
{
i = 0;

func(); // 1

return 0;
}

int i; // The data definition
// int i; // compile error: redefinition
void func() // function definition
{
i++;

cout << i << endl;
}
// void func() {} // compile error: redefinition
/*
g++ Forward.cpp -o Forward
./Forward
1
*/

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Chapter_3     Exercise_3-10

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Constants_in_C     Exercise_3-11