c语言经典练习题100道(十)

　　【程序46】题目：宏#define命令练习(1)

　　1.程序源代码：

#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】题目：宏#define命令练习(2)

　　1.程序源代码：

#include "stdio.h"

#include "conio.h"/*宏定义中允许包含两道衣裳命令的情形，此时必须在最右边加上"\"*/

#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】题目：宏#define命令练习(3)

　　1.程序源代码：

#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】题目：#if #ifdef和#ifndef的综合应用。

　　1. 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();}

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　　【程序50】题目：#include 的应用练习

　　1..程序源代码： test.h 文件如下:

#define LAG >

#define SMA <

#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 SMA j)

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

else

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

getch();

}

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