Scrapbooking Embelishments

Sends needed data back to main function

• Data will be used in code inside of main or will send data to another function

Prototype:

• Directs compiler to the program defined function

• Code before void main ( )

• Syntax:

  • Data type functionName(parameter types);

    • or

  • Data type functionName( );

• Parameters:

  • Information needed from main by function is sent in parameters

Calling or invoking a function:

• Directs program to perform code in function definition

• Write code in main function – can be repeated as needed

• Calls for value returning function start with location for return (often a variable from main)

• Syntax for call:

  • variableName = functionName(variable names);

    • Or

  • variableName = functionName( );

    • or send to the screen

  • cout << functionName();

    • or send to a file

  • outFile << functionName();

User defined definition:

• Block of code performed when “called” inside of main function

• Written after end of main function

• Begins with function header:

  • Header begins with data type that will be returned

  • No semicolon at end of header

• Syntax:

  • Function Header: (no semi-colon)

    • datatype functionName(variable type variableName)

      • or

    • datatype functionName( )

  • Open curly brace {

  • Block of code that will perform a task

    • Ending with:

      • return variableName;

  • Close curly brace }