chap2.lst

Borland C++ Builder The Complete Reference 例程源代码

listing 1
const int a;

listing 2
const int count = 100;

listing 3
const volatile unsigned char *port = (const volatile char *) 0x30;

listing 4
int i, j, l; 
 
short int si; 
 
unsigned int ui; 
 
double balance, profit, loss;

listing 5
void func1(void) 
{ 
  int x; 
 
  x = 10; 
} 
 
void func2(void) 
{ 
  int x; 
 
  x = -199; 
}

listing 6
void f(void) 
{ 
  int t; 
 
  scanf("%d", &t); 
 
  if(t==1) { 
    char s[80];  /* s exists only inside this block */ 
    printf("enter name:"); 
    gets(s); 
    process(s); 
  } 
  /* s is not known here */ 
}

listing 7
/* return 1 if c is part of string s; 0 otherwise */ 
int is_in(char *s, char c) 
{ 
  while(*s) 
    if(*s==c) return 1; 
    else s++; 
 
  return 0; 
}

listing 8
#include <stdio.h> 
 
void func1(void), func2(void); 
 
int count;  /* count is global  */ 
 
int main(void) 
{ 
  count = 100; 
  func1(); 
 
  return 0;  
} 
 
void func1(void) 
{ 
  func2(); 
  printf("count is %d", count); /* will print 100 */ 
} 
 
void func2(void) 
{ 
  int count; 
 
  for(count=1; count<10; count++) 
    putchar(' '); 
}

listing 9
#include <stdio.h> 
 
int main(void) 
{ 
  extern int first, last;  /* use global vars */ 
  printf("%d %d", first, last); 
 
  return 0; 
} 
 
/* global definition of first and last */ 
int first = 10, last = 20; 

listing 10
#include <stdio.h> 
#include <conio.h> 
 
int count(int i); 
 
int main(void) 
{ 
  do { 
    count(0); 
  } while(!kbhit()); 
  printf("count called %d times", count(1)); 
 
  return 0; 
} 
 
int count(int i) 
{ 
  static int c=0; 
 
  if(i) return c; 
  else c++; 
 
  return 0; 
}

listing 11
int series(void) 
{ 
  static int series_num; 
 
  series_num = series_num+23; 
  return series_num; 
}

listing 12
/* This must all be in one file - preferably by itself */ 
 
static int series_num; 
 
int series(void); 
void series_start(int seed); 
 
int series(void) 
{ 
  series_num = series_num + 23; 
  return series_num; 
} 
 
/* initialize series_num */ 
void series_start(int seed) 
{ 
  series_num = seed; 
}

listing 13
int int_pwr(register int m, register int e) 
{ 
  register int temp; 
 
  temp = 1; 
 
  for(; e; e--) temp *= m; 
 
  return temp; 
}

listing 14
x = y = z = 0;

listing 15
int x; 
char ch; 
float  f; 
void func(void) 
{ 
  ch = x;    /* line 1 */ 
  x = f;     /* line 2 */ 
  f = ch;    /* line 3 */ 
  f = x;     /* line 4 */ 
}

listing 16
char ch = 'a'; 
 
int first = 0; 
 
float balance = 123.23;

listing 17
ch = '\t'; 
printf("%c this is a test\n", ch);

listing 18
int x, y; 
 
x = 10; 
y = 3; 
 
printf("%d", x/y);   /* will display 3 */ 
printf("%d", x%y);   /* will display 1, the remainder of 
                        the integer division */ 
 
x = 1; 
y = 2; 
 
printf("%d %d", x/y, x%y); /*  will display 0 1 */

listing 19
x = x + 1;

listing 20
++x;

listing 21
x = x - 1;

listing 22
--x;

listing 23
x = x + 1;

listing 24
++x;

listing 26
x = 10; 
y = ++x;

listing 27
x = 10; 
y = x++;

listing 28
int x; 
 
x = 100; 
printf("%d", x > 10);

listing 29
char get_char_from_modem(void) 
{ 
  char ch; 
 
  ch = read_modem(); /* get a character from the 
                        modem port */ 
  return(ch & 127); 
}

listing 30
/* A simple cipher function. */ 
char encode(char ch) 
{ 
  return(~ch); /* complement it */ 
}

listing 31
x = 10; 
y = x>9 ? 100 : 200;

listing 32
x = 10; 
if(x>9) y = 100; 
else y = 200;

listing 33
m = &count;

listing 34
q = *m;

listing 35
char *pch;

listing 36
int x, *y, count;

listing 37
#include <stdio.h> 
 
/* Assignment with * and &. */ 
int main(void) 
{ 
  int target, source; 
  int *m; 
 
  source = 10; 
  m = &source; 
  target = *m; 
 
  printf("%d", target); 
 
  return 0; 
}

listing 38
double f; 
 
printf("%f ", sizeof f); 
printf("%d", sizeof(int));

listing 39
/* Write 6 integers to a disk file */ 
void put_rec(FILE *fp, int rec[6]) 
{ 
  int size, num; 
 
  size = sizeof(int) * 6; 
  num = fwrite(rec, size, 1, fp); 
  if(num!=1) printf("Write Error"); 
}

listing 41
y = 10; 
x = (y=y-5, 25/y);

listing 42
struct employee { 
  char name[80]; 
  int age; 
  float wage; 
} emp; 
 
struct employee *p = &emp; /* address of emp into p */

listing 43
emp.wage = 123.23;

listing 44
p->wage = 123.23;

listing 45
#include <stdio.h> 
 
char s[80]; 
 
int main(void) 
{ 
   s[3] = 'X'; 
   printf("%c", s[3]); 
 
  return 0; 
}

listing 46
(float) x/2

listing 47
#include <stdio.h> 
 
/* Print i and i/2 with fractions. */ 
int main(void) 
{ 
  int i; 
 
  for(i=1; i<=100; ++i ) 
    printf("%d / 2 is: %f\n", i, (float) i/2); 
 
  return 0; 
}

listing 48
x=10/y~(127/x); 
 
x = 10 / y ~(127/x);

listing 49
x=y/3-34*temp&127; 
 
x = (y/3) - (34*temp) & 127;

listing 50
x = x + 10;

listing 51
x += 10;

listing 52
x = x - 100;

listing 53
x -= 100;