Functions

Formally...

A function declaration in ANSI C has the form:

result-type function-name( parameter-list ) function-body

Examples

A function which has one integer as a parameter and returns an integer:

/* Declare the function : */ int times_two(int x) { return x+x; } .... /* Use the function : */ printf("%d\n", times_two(8)); printf("%d\n", times_two(a));

And one which returns no value...

/* tea_message does not return a result */ /* and has no parameters : */ void tea_message ( void ) { printf("Time for tea!\n"); } ... /* Display message : */ tea_message();