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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