Writing C program with GCC and makefile for the first time

List of articles

• One 、 use gcc Write a main function main.c And subroutines sub.c
• Two 、 use Makefile To write
• summary

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One 、 use gcc Write a main function main.c And subroutines sub.c

1. Write a main function main.c

#include"stdio.h"
float x2x(int a,int b);
int main()
{
	int x=2,y=4;            // Definition x and y Variable 
	printf("%.2f\n",x2x(x,y));     
	return 0;
}

2. Write a sub function sub.c

float x2x(int a,int b)
{
	float c;
	c=a+b;
	return c;
}

3. Run the program

4.windows use dev c++ To write

sub.h

#include"stdio.h"
float x2x(int a,int b)
{
 float c;
 c=a+b;
return c;
}

main.c

#include"stdio.h"
#include"sub.h"
float x2x(int a,int b);
int main(){
int x=2,y=4;
printf("%.2f\n", x2x(x,y));
return 0;
}

  Run the program

 

 

Two 、 use Makefile To write

1.Makefile Rules for writing

target:prerequisites
command # command With a tab Key start

# target For a target file , It can be Object File, It can also be an execution file . It can also be a label （Label）
# prerequisites It needs to be generated target Depending on the file or target
# command That is to say make Commands that need to be executed .（ Any of the Shell command ）

2. To write makefile file

main:sub.o main.c
	gcc main.c sub.o -o main

sub.o:sub.c
	gcc -c sub.c -o sub.o

clean:
	rm *.o

Use it carefully tab Key start ！

3. Use makefile compile c Program

4. Execute the command in the source file directory make clean, You can delete the *.o file

5. Running results

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summary

Make and makefile You can maintain multiple files ,Make and makefile The relationship between ：make It's a command tool , It's an explanation makefile The command tool of the command in , Generally speaking , Most of the IDE There's an order to .

reference ：Ubuntu System use gcc and Makefile compile C Program _ No # once ＆ Listening blog -CSDN Blog ​​​​​​

                  Ubuntu16.04 Next C Language compilation and makefile Application - lee_24 - Blog Garden