Calling an undeclared function is poor style in C (See this) and illegal in C++. So is passing arguments to a function using a declaration that doesn’t list argument types:

　　If we save the below program in a .c file and compile it, it works without any error. But, if we save the same in a .cpp file, it doesn’t compile.

1 #include 
     
       2  3 void f(); /* Argument list is not mentioned */ 4  5 int main() 6 { 7     f(2); /* Poor style in C, invalid in C++*/ 8     getchar(); 9     return 0;10 }11 12 void f(int x)13 { 14     printf("%d", x);15 }
     

　　'c' parameter checking is not done at declaration but in 'c++' parameter checking is done at declaration

　　

　　Source:

 

 

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　　2013-11-27　　12:11:06