Programming in C++ Function Call Syntax( Cont) Argument List Expression, Expression >When a function call is executed the arguments are passed to the parameters according to their positions, left to right, and control is then transferred to the first executable statement in the function body. )When the last statement in the function has executed control returns to the point from which the function was called
6 Function Call Syntax（Cont.） Expression, Expression… Argument List ➢When a function call is executed, the arguments are passed to the parameters according to their positions, left to right, and control is then transferred to the first executable statement in the function body. ➢When the last statement in the function has executed, control returns to the point from which the function was called
Programming in C++ TWo Parts of Function Definition int Cube( int n) heading body return nxnxn
7 Two Parts of Function Definition int Cube ( int n ) heading { body return n * n * n ; }
Programming in C++ What is in a heading? type of value returned name of parameter list int Cube int n
8 What is in a heading? int Cube ( int n ) type of value returned name of function parameter list
Programming in C++ What is in a prototype? A prototype looks like a heading but must end with a semicolon; and its parameter list just needs to contain the type of each parameter. int Cube( int ); prototype
9 What is in a prototype? A prototype looks like a heading but must end with a semicolon; and its parameter list just needs to contain the type of each parameter. int Cube( int ); // prototype
Programming in C++ The difference between Function Definition and Function Prototype )Function Definition: A function declaration that includes the body of the function >Function Prototype: A function declaration that without the body of the function Note that all definitions are declarations but not all declarations are definitions The rule throughout C++ is that you can declare an item as many times as you wish, but you can define it only once 10
10 The difference between Function Definition and Function Prototype ➢Function Definition: A function declaration that includes the body of the function. ➢Function Prototype: A function declaration that without the body of the function. • Note that all definitions are declarations, but not all declarations are definitions. • The rule throughout C++ is that you can declare an item as many times as you wish, but you can define it only once