Mathematical Function - Lecture Slides | CMSC 106, Study notes of Computer Science

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CMSC 106Lecture Set

Set Started:

Tuesday, October 9, 2007

Function definition

Gives a name to a group of statements which can then beexecuted (called) just using that name.

Mathematical functions

sin(x) = y

^

^

^

function's result

+-- argument

| +-- function name

In C, function result is called return value

Simple example functiondefinition:

void

error_msg(void) {

printf("This ");printf("is Bad Input\n");

return;

function

name

= "error_msg"

return type

= nothing

list of parameters

= empty

body

has only three statements

Calling (executing) a function:

general form:

function-name(any arguments)

as a statement:

printf("Hello,");

or as an expression in assignment:

ch = getchar();

or as an expression being tested in a

condition:

while (!feof(stdin))

Examples

parameter passing example

return value example

function calling function example