Here is an example of a function that adds two integers and prints the
sum with C's "print formatted" function named printf, using the
characters %d to specify integer output.
void add_two_numbers (int a, int b) /* Add a and b */
{
int c;
c = a + b;
printf ("%d\n", c);
}
The variables a and b are parameters passed in from
outside the function. The code defines a, b, and c
to be of type int, or integer.
The function above is not much use standing alone. Here is a
main function that calls the add_two_numbers function:
int main()
{
int var1, var2;
var1 = 1;
var2 = 53;
add_two_numbers (var1, var2);
add_two_numbers (1, 2);
exit(0);
}
When these functions are incorporated into a C program, together they
print the number 54, then they print the number 3, and then they stop.
