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    C语言教程-第61页

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      #include "stdio.h"

      #include "conio.h"

      void main()

      {

      int i=10;

      int j=20;

      if(i LAG j)

      printf("\40: %d larger than %d \n",i,j);

      else if(i EQ j)

      printf("\40: %d equal to %d \n",i,j);

      else if(i 【创建和谐家园】A j)

      printf("\40:%d 【创建和谐家园】aller than %d \n",i,j);

      else

      printf("\40: No such value.\n");

      getch();

      }

      ==============================================================

      【程序49】

      题目:#if #ifdef和#ifndef的综合应用。

      1. 程序分析:

      2.程序源代码:

      #include "stdio.h"

      #include "conio.h"

      #define MAX

      #define MAXIMUM(x,y) (x>y)?x:y

      #define MINIMUM(x,y) (x>y)?y:x

      void main()

      {

      int a=10,b=20;

      #ifdef MAX

      printf("\40: The larger one is %d\n",MAXIMUM(a,b));

      #else

      printf("\40: The lower one is %d\n",MINIMUM(a,b));

      #endif

      #ifndef MIN

      printf("\40: The lower one is %d\n",MINIMUM(a,b));

      #else

      printf("\40: The larger one is %d\n",MAXIMUM(a,b));

      #endif

      #undef MAX

      #ifdef MAX

      printf("\40: The larger one is %d\n",MAXIMUM(a,b));

      #else

      printf("\40: The lower one is %d\n",MINIMUM(a,b));

      #endif

      #define MIN

      #ifndef MIN

      printf("\40: The lower one is %d\n",MINIMUM(a,b));

      #else

      printf("\40: The larger one is %d\n",MAXIMUM(a,b));

      #endif

      getch();

      }

      ==============================================================

      【程序50】

      题目:#include 的应用练习   

      1.程序分析:

      2.程序源代码:

      test.h 文件如下:

      #define LAG >

      #define 【创建和谐家园】A <

      #define EQ ==

      主文件如下:

      #include "test.h" /*一个新文件50.c,包含test.h*/

      #include "stdio.h"

      #include "conio.h"

      void main()

      {

      int i=10;

      int j=20;

      if(i LAG j)

      printf("\40: %d larger than %d \n",i,j);

      else if(i EQ j)

      printf("\40: %d equal to %d \n",i,j);

      else if(i 【创建和谐家园】A j)

      printf("\40:%d 【创建和谐家园】aller than %d \n",i,j);

      else

      printf("\40: No such value.\n");

      getch();

      }

        .:.:经典c程序100例==51--60:.:.

          经典c程序100例==51--60

      【程序51】

      题目:学习使用按位与 & 。   

      1.程序分析:0&0=0; 0&1=0; 1&0=0; 1&1=1

      2.程序源代码:

      #include "stdio.h"

      main()

      {

      int a,b;

      a=077;

      b=a&3;

      printf("\40: The a & b(decimal) is %d \n",b);

      b&=7;

      printf("\40: The a & b(decimal) is %d \n",b);

      }

      ==============================================================

      【程序52】

      题目:学习使用按位或 | 。

      1.程序分析:0|0=0; 0|1=1; 1|0=1; 1|1=1            

      2.程序源代码:

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