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=On CS Systems - gcc=
For CS courses that use C, the gcc compiler is often used. This is already installed on the CS server. To get started do the following.
* Use a terminal text editor (see [[Text Editors]]) to edit your C program file. Let's say your program is <code>hello.c</code>
* Compile the program using the gcc command:
<pre>
gcc hello.c -o hello.o
</pre>
If you do not have any errors in your program, the file <code>hello.o</code> will be created.
* Run the program by running:
<pre>
./hello.o
</pre>

You can use the classic "hello world" program as a first attempt.
<pre>
#include <stdio.h>

int main(int argc, char *argv[]) {
printf("Hello world!\n");
return 0;
}
</pre>
gcc is documented at https://gcc.gnu.org/onlinedocs/

==Makefile==
Rather than type the gcc command each time you want to compile, you can put the right commands into a Makefile and use the <code>make</code> command. The following is a basic Makefile which will compile all <code>.c</code> files in the current directory.
<pre>
SHELL = /bin/sh
CFLAGS = -g -Wall -O0
SRCS = $(wildcard *.c)
OBJS = $(SRCS:.c=.o)

all: $(OBJS)

%.o : %.c
-gcc $(CFLAGS) $< -o $@

clean:
rm -f *.o
</pre>
Save this file with the filename <code>Makefile</code>. Then type <code>make</code> to compile all of the .c files. Type <code>make clean</code> to remove the compiled .o files, to then recompile all .c files with the next <code>make</code> command.

Note that the make command invokes GNU Make, which is documented at https://www.gnu.org/software/make/manual/make.html

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