c++ - error: expected constructor, destructor, or type conversion before ‘main’ -

i trying figure out how jump 1 function come , preform another. when compile error

error: expected constructor, destructor, or type conversion before ‘main’ 

here code:

#include <iostream> #include "32pm.cpp"  pm()  int main() {   std::cout << "hello world!"; } 

a function call followed semicolon, statement. statements can used in function body. e.g. in body of main.

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note declarations in c++ come in 2 flavors: block declarations, can used statements in blocks, , non-block declarations, can (directly) used outside functions.

e.g. variable declaration block declaration, , namespace definition (or matter full function definition) non-block declaration.

it's arbitary, essence there divide between constructs can used statements, , cannot, , part of c++ grammar.