【程序46】 題目：宏#define命令練習(xí)(1)

　　1.程序源代碼：

#include "stdio.h"

#include "conio.h"

#define TRUE 1

#define FALSE 0#define SQ(x) (x)*(x)

void main(){

  int num;

  int again=1;

  printf("\40: Program will stop if input value less than 50.\n");

  while(again)

  {

    printf("\40:Please input number==>");

    scanf("%d",&num);

    printf("\40:The square for this number is %d \n",SQ(num));

    if(num>=50)

      again=TRUE;

    else

      again=FALSE;

  }

  getch();

}

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　　【程序47】 題目：宏#define命令練習(xí)(2)

　　1.程序源代碼：

#include "stdio.h"

#include "conio.h"/*宏定義中允許包含兩道衣裳命令的情形，此時(shí)必須在最右邊加上"\"*/

#define exchange(a,b) { \

                        int t;\

                        t=a;\

                        a=b;\

                        b=t;\

                      }

void main(void){

  int x=10;

  int y=20;

  printf("x=%d; y=%d\n",x,y);

  exchange(x,y);

  printf("x=%d; y=%d\n",x,y);

  getch();

}

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　　【程序48】 題目：宏#define命令練習(xí)(3)

　　1.程序源代碼：

#define LAG >

#define SMA <

#define EQ ==

#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 SMA j)

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

      else

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

  getch();

}

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　　【程序49】 題目：#if #ifdef和#ifndef的綜合應(yīng)用。

　　1. 程序源代碼：

#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();}

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　　【程序50】 題目：#include 的應(yīng)用練習(xí)

　　1..程序源代碼： test.h 文件如下:

#define LAG >

#define SMA <

#define EQ ==

//主文件如下:

#include "test.h" /*一個(gè)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 SMA j)

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

      else

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

  getch();

}

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