Intel XENIX 286 Programmers Guide (86) - Tenox.tc

XENIX Programming cc: C Compiler
You can execute the new program by typing
a.out
The program waits until you enter two numbers, then prints their sum. For example, if
you type "3 5" the program displays "8".
Compiling Several Source Files
Large source programs are often split into several files to make them easier to
understand, update, and edit. You can compile such a program by giving the names of
all the files belonging to the program when you invoke the cc command. The command
reads and compiles each file in turn, then links all object files together, and copies the
new program to the file a.out.
To compile several source files, type
cc filename •
• •
where each filename is separated from the next by at least one space. One of these
files (and only one) must contain a "main" function. The others may contain functions
called by this "main" function or by other functions in the program. The files must not
contain calls to functions not explicitly defined by the program or by the standard C
library.
For example, suppose the following main program function is stored in the file main.
#include
extern int add();
main ()
{
int x,y,z;
}
scanf ("%d %d", &x, &y);
z = add (x, y);
printf (" %d \n", z);
Assume that the following function is stored in the file add.c.
add (a, b)
int a, b;
{
return (a + b);
}
You can compile these files and create an executable program by typing
cc main.c add.c
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