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C 程式開發

  • Windows平台:Dev-c++, Visual studio 2017 community
  • Linux 平台: gcc

使用Linux 平台C程式開發:

1.編輯程式: gedit  myc_1_1.c
2.編譯: gcc myc_1_1.c -o myc_1_1
3.執行:./myc_1_1

windows 10截圖: alt+fn+ prt scr

說明下列程式的關鍵

/* myc_1_1, 我的第一個C程式碼 */ 
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
   printf("Hello 偉大的恩師!\n");   	/* 印出Hello 偉大的恩師! 字串 */
   printf("Hello Taiwan!\n");        /* 印出Hello Taiwan! 字串 */   
   
   system("pause");
   return ;
   printf("Hello World!\n");
}

Question 1:#include <stdio.h>
include 是何意義??
stdio有何用途?
std英文全名為何?
i是何意義??o是何意義??
h = header =標頭檔有何用途? 
https://zh.wikipedia.org/wiki/Stdio.h

Question 2:#include <stdlib.h>
stdlib有何用途?
std英文全名為何?
lib是何意義??
https://zh.wikipedia.org/wiki/Stdlib.h

Question 3:   system("pause");
stdlib有何用途?
std英文全名為何?
lib是何意義??
https://zh.wikipedia.org/wiki/Stdlib.h

/* myc_1_1, 我的第一個C程式碼 */ 
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
   printf("Hello 偉大的恩師!\n");   	/* 印出Hello 偉大的恩師! 字串 */
   printf("Hello Taiwan!\n");   /* 印出Hello Taiwan! 字串 */   
   
//  system("pause");
   return ;
   printf("Hello World!\n");
}

#include <stdio.h>
#include <stdlib.h>
printme()
{
	   printf("Hello 偉大的恩師!\n");  	/* 印出Hello 偉大的恩師! 字串 */
	   printf("Hello Taiwan!\n") ;  /* 印出Hello Taiwan! 字串 */   
}

printtree()
{
      printf("    \n"); 
      printf("    \n"); 
      printf("    *    \n"); 
      printf("   ***    \n"); 
      printf("  *****    \n");
      printf(" *******    \n");
}
      

int main(void)
{
   printf("我是史上最霹靂無敵的XXXX!\n");
   printme();
   printtree();
//  system("pause");
   return ;
   printf("Hello World!\n");
}

Linux 平台上的C程式:

錯誤訊息

 error: ‘rreturn’ undeclared (first use in this function)
    rreturn ;
    ^~~~~~~
myc_1_1.c:9:4: note: each undeclared identifier is reported only once for each function it appears in

warning: ‘return’ with no value, in function returning non-void
    return ;
    ^~~~~~
myc_1_1.c:3:5: note: declared here
 int main(void)

執行過程

root@kali:~# gcc myc_1_1.c -o myc_1_1.exe

myc_1_1.c: In function ‘main’:
myc_1_1.c:9:4: warning: ‘return’ with no value, in function returning non-void
    return ;
    ^~~~~~
myc_1_1.c:3:5: note: declared here
 int main(void)
     ^~~~

root@kali:~# ls

Desktop    Downloads  myc_1_1.c    Pictures  Templates
Documents  Music      myc_1_1.exe  Public    Videos

root@kali:~# ./myc_1_1.exe

Hello 偉大的恩師!
Hello Taiwan!

root@kali:~# file myc_1_1.exe

myc_1_1.exe: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=649cc14a0f4144ffceaef39b1503230410fc9e24, not stripped

root@kali:~# strings myc_1_1.exe

/lib64/ld-linux-x86-64.so.2
libc.so.6
puts
__cxa_finalize
__libc_start_main
GLIBC_2.2.5
_ITM_deregisterTMCloneTable
__gmon_start__
_ITM_registerTMCloneTable
AWAVA
AUATL
[]A\A]A^A_
Hello 
Hello Taiwan!
;*3$"
GCC: (Debian 7.2.0-18) 7.2.0
crtstuff.c
deregister_tm_clones
__do_global_dtors_aux
completed.7045
__do_global_dtors_aux_fini_array_entry
frame_dummy
__frame_dummy_init_array_entry
myc_1_1.c
__FRAME_END__
__init_array_end
_DYNAMIC
................有很多