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C语言措施开拓经典实例之五

2017-11-02 08:00 星期四 所属: C语言/C++ 教程 浏览:56

副标题#e#

【措施41】

题目:进修static界说静态变量的用法

1.措施阐明:

2.措施源代码:

#include "stdio.h"
varfunc()
{
 int var=0;
 static int static_var=0;
 printf("\40:var equal %d \n",var);
 printf("\40:static var equal %d \n",static_var);
 printf("\n");
 var++;
 static_var++;
}
void main()
{
 int i;
 for(i=0;i<3;i++)
  varfunc();
}

【措施42】

题目:进修利用auto界说变量的用法

1.措施阐明:

2.措施源代码:

#include "stdio.h"
main()
{
 int i,num;
 num=2;
 for (i=0;i<3;i++)
 {
  printf("\40: The num equal %d \n",num);
  num++;
  {
   auto int num=1;
   printf("\40: The internal block num equal %d \n",num);
   num++;
  }
 }
}


#p#副标题#e#

【措施43】

题目:进修利用static的另一用法。

1.措施阐明:

2.措施源代码:

#include "stdio.h"
main()
{
 int i,num;
 num=2;
 for(i=0;i<3;i++)
 {
  printf("\40: The num equal %d \n",num);
  num++;
  {
   static int num=1;
   printf("\40:The internal block num equal %d\n",num);
   num++;
  }
 }
}

【措施44】

题目:进修利用external的用法。

1.措施阐明:

2.措施源代码:

#include "stdio.h"
int a,b,c;
void add()
{
 int a;
 a=3;
 c=a+b;
}
void main()
{
 a=b=4;
 add();
 printf("The value of c is equal to %d\n",c);
}

#p#副标题#e#

【措施45】

题目:进修利用register界说变量的要领。

1.措施阐明:

2.措施源代码:

void main()
{
 register int i;
 int tmp=0;
 for(i=1;i<=100;i++)
  tmp+=i;
  printf("The sum is %d\n",tmp);
}

【措施46】

题目:宏#define呼吁操练(1)

1.措施阐明:

2.措施源代码:

#include "stdio.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;
 }
}

#p#副标题#e#

【措施47】

题目:宏#define呼吁操练(2)

1.措施阐明:

2.措施源代码:

#include "stdio.h"
#define exchange(a,b)
{
  /*宏界说中答允包括两道衣裳呼吁的景象,此时必需在最右边加上"\"*/
  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);
}

【措施48】

题目:宏#define呼吁操练(3)

1.措施阐明:

2.措施源代码:

#define LAG >
#define SMA <
#define EQ ==
#include "stdio.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");
}

#p#副标题#e#

【措施49】

题目:#if #ifdef和#ifndef的综合应用。

1. 措施阐明:

2.措施源代码:

#include "stdio.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
}

【措施50】

题目:#include 的应用操练

1.措施阐明:

2.措施源代码:

test.h 文件如下:

#p#分页标题#e#

#define LAG >
#define SMA <
#define EQ ==
#include "test.h" /*一个新文件50.c,包括test.h*/
#include "stdio.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");
}

 

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