Definition and Declaration

A function definition contains function name, parameters, its code and return type and A function declaration contains only name and return type. User can define a function only once but it can be declared several times. declaration of function Syntax : < return_type> < function_name>(arguments... ); /* Declaration of area() */ int area(int x, int y); int main() { int x=10, y=25; printf(''%d\n'',area(x,y))); return 0; } Definition of function syntax < return_type> < function_name>(arguments) { Body of function; } /* Definition of area() */ int area(int x, int y) { int z; z = x*y; retrun z; }