一个小型的操作系统,采用gcc进行开发,几千行的代码,方便初学者学习

				extern int subab(int a, int b);				main()				{				    int a = 3, b = 2;				    int c;				    printf(" in main a=%d b=%d\n", a, b);				    c = subab(a, b);				//c++;				    printf("\n%d\n", c);				}