ㄧ计: sound
: ﹚繵瞯ゴ秨PC喘羘竟
ノ 猭: void sound(unsigned frequency);
祘ㄒ:
/* Emits a 7-Hz tone for 10 seconds.
Your PC may not be able to emit a 7-Hz tone. */
#include <dos.h>
int main(void)
{
sound(7);
delay(10000);
nosound();
return 0;
}
ㄧ计: spawnl
: 承笲︽祘
ノ 猭: int spawnl(int mode, char *pathname, char *arg0,
arg1, ... argn, NULL);
祘ㄒ:
#include <process.h>
#include <stdio.h>
#include <conio.h>
int main(void)
{
int result;
clrscr();
result = spawnl(P_WAIT, "tcc.exe", NULL);
if (result == -1)
{
perror("Error from spawnl");
exit(1);
}
return 0;
}
ㄧ计: spawnle
: 承笲︽祘
ノ 猭: int spawnle(int mode, char *pathname, char *arg0,
arg1,..., argn, NULL);
祘ㄒ:
/* spawnle() example */
#include <process.h>
#include <stdio.h>
#include <conio.h>
int main(void)
{
int result;
clrscr();
result = spawnle(P_WAIT, "tcc.exe", NULL, NULL);
if (result == -1)
{
perror("Error from spawnle");
exit(1);
}
return 0;
}
ㄧ计: sprintf
: 癳Αて块才﹃い
ノ 猭: int sprintf(char *string, char *farmat [,argument,...]);
祘ㄒ:
#include <stdio.h>
#include <math.h>
int main(void)
{
char buffer[80];
sprintf(buffer, "An approximation of Pi is %f\n", M_PI);
puts(buffer);
return 0;
}
ㄧ计: sqrt
: 璸衡キよ
ノ 猭: double sqrt(double x);
祘ㄒ:
#include <math.h>
#include <stdio.h>
int main(void)
{
double x = 4.0, result;
result = sqrt(x);
printf("The square root of %lf is %lf\n", x, result);
return 0;
}
ㄧ计: srand
: ﹍て繦诀计祇ネ竟
ノ 猭: void srand(unsigned seed);
祘ㄒ:
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
int main(void)
{
int i;
time_t t;
srand((unsigned) time(&t));
printf("Ten random numbers from 0 to 99\n\n");
for(i=0; i<10; i++)
printf("%d\n", rand() % 100);
return 0;
}
ㄧ计: sscanf
: 磅︽眖才﹃いΑて块
ノ 猭: int sscanf(char *string, char *format[,argument,...]);
祘ㄒ:
#include <stdio.h>
#include <conio.h>
int main(void)
{
char label[20];
char name[20];
int entries = 0;
int loop, age;
double salary;
struct Entry_struct
{
char name[20];
int age;
float salary;
} entry[20];
/* Input a label as a string of characters restricting to 20 characters */
printf("\n\nPlease enter a label for the chart: ");
scanf("%20s", label);
fflush(stdin); /* flush the input stream in case of bad input */
/* Input number of entries as an integer */
printf("How many entries will there be? (less than 20) ");
scanf("%d", &entries);
fflush(stdin); /* flush the input stream in case of bad input */
/* input a name restricting input to only letters upper or lower case */
for (loop=0;loop<entries;++loop)
{
printf("Entry %d\n", loop);
printf(" Name : ");
scanf("%[A-Za-z]", entry[loop].name);
fflush(stdin); /* flush the input stream in case of bad input */
/* input an age as an integer */
printf(" Age : ");
scanf("%d", &entry[loop].age);
fflush(stdin); /* flush the input stream in case of bad input */
/* input a salary as a float */
printf(" Salary : ");
scanf("%f", &entry[loop].salary);
fflush(stdin); /* flush the input stream in case of bad input */
}
/* Input a name, age and salary as a string, integer, and double */
printf("\nPlease enter your name, age and salary\n");
scanf("%20s %d %lf", name, &age, &salary);
/* Print out the data that was input */
printf("\n\nTable %s\n",label);
printf("Compiled by %s age %d $%15.2lf\n", name, age, salary);
printf("-----------------------------------------------------\n");
for (loop=0;loop<entries;++loop)
printf("%4d | %-20s | %5d | %15.2lf\n",
loop + 1,
entry[loop].name,
entry[loop].age,
entry[loop].salary);
printf("-----------------------------------------------------\n");
return 0;
}
ㄧ计: stat
: 弄ゴ秨ゅン獺
ノ 猭: int stat(char *pathname, struct stat *buff);
祘ㄒ:
#include <sys\stat.h>
#include <stdio.h>
#include <time.h>
#define FILENAME "TEST.$$$"
int main(void)
{
struct stat statbuf;
FILE *stream;
/* open a file for update */
if ((stream = fopen(FILENAME, "w+")) == NULL)
{
fprintf(stderr, "Cannot open output file.\n");
return(1);
}
/* get information about the file */
stat(FILENAME, &statbuf);
fclose(stream);
/* display the information returned */
if (statbuf.st_mode & S_IFCHR)
printf("Handle refers to a device.\n");
if (statbuf.st_mode & S_IFREG)
printf("Handle refers to an ordinary file.\n");
if (statbuf.st_mode & S_IREAD)
printf("User has read permission on file.\n");
if (statbuf.st_mode & S_IWRITE)
printf("User has write permission on file.\n");
printf("Drive letter of file: %c\n", 'A'+statbuf.st_dev);
printf("Size of file in bytes: %ld\n", statbuf.st_size);
printf("Time file last opened: %s\n", ctime(&statbuf.st_ctime));
return 0;
}
ㄧ计: _status87
: 疊翴篈
ノ 猭: unsigned int _status87(void);
祘ㄒ:
#include <stdio.h>
#include <float.h>
int main(void)
{
float x;
double y = 1.5e-100;
printf("Status 87 before error: %x\n", _status87());
x = y; /* <-- force an error to occur */
y = x;
printf("Status 87 after error : %x\n", _status87());
return 0;
}
ㄧ计: stime
: 砞竚丁
ノ 猭: int stime(long *tp);
祘ㄒ:
#include <stdio.h>
#include <time.h>
#include <dos.h>
int main(void)
{
time_t t;
struct tm *area;
t = time(NULL);
area = localtime(&t);
printf("Number of seconds since 1/1/1970 is: %ld\n", t);
printf("Local time is: %s", asctime(area));
t++;
area = localtime(&t);
printf("Add a second: %s", asctime(area));
t += 60;
area = localtime(&t);
printf("Add a minute: %s", asctime(area));
t += 3600;
area = localtime(&t);
printf("Add an hour: %s", asctime(area));
t += 86400L;
area = localtime(&t);
printf("Add a day: %s", asctime(area));
t += 2592000L;
area = localtime(&t);
printf("Add a month: %s", asctime(area));
t += 31536000L;
area = localtime(&t);
printf("Add a year: %s", asctime(area));
return 0;
}
ㄧ计: stpcpy
: ī才﹃
ノ 猭: char *stpcpy(char *destin, char *source);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char string[10];
char *str1 = "abcdefghi";
stpcpy(string, str1);
printf("%s\n", string);
return 0;
}
ㄧ计: strcat
: 才﹃钡ㄧ计
ノ 猭: char *strcat(char *destin, char *source);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char destination[25];
char *blank = " ", *c = "C++", *Borland = "Borland";
strcpy(destination, Borland);
strcat(destination, blank);
strcat(destination, c);
printf("%s\n", destination);
return 0;
}
ㄧ计: strchr
: ﹃い琩т倒﹚才材で皌ぇ矪\
ノ 猭: char *strchr(char *str, char c);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char string[15];
char *ptr, c = 'r';
strcpy(string, "This is a string");
ptr = strchr(string, c);
if (ptr)
printf("The character %c is at position: %d\n", c, ptr-string);
else
printf("The character was not found\n");
return 0;
}
ㄧ计: strcmp
: ﹃ゑ耕
ノ 猭: int strcmp(char *str1, char *str2);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *buf1 = "aaa", *buf2 = "bbb", *buf3 = "ccc";
int ptr;
ptr = strcmp(buf2, buf1);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1\n");
else
printf("buffer 2 is less than buffer 1\n");
ptr = strcmp(buf2, buf3);
if (ptr > 0)
printf("buffer 2 is greater than buffer 3\n");
else
printf("buffer 2 is less than buffer 3\n");
return 0;
}
ㄧ计: strncmpi
: 盢﹃い场だ籔﹃ゑ耕, ぃ恨糶
ノ 猭: int strncmpi(char *str1, char *str2, unsigned maxlen);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *buf1 = "BBB", *buf2 = "bbb";
int ptr;
ptr = strcmpi(buf2, buf1);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1\n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1\n");
if (ptr == 0)
printf("buffer 2 equals buffer 1\n");
return 0;
}
ㄧ计: strcpy
: ﹃ī
ノ 猭: char *strcpy(char *str1, char *str2);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char string[10];
char *str1 = "abcdefghi";
strcpy(string, str1);
printf("%s\n", string);
return 0;
}
ㄧ计: strcspn
: ﹃い琩т材倒﹚才栋ず甧琿
ノ 猭: int strcspn(char *str1, char *str2);
祘ㄒ:
#include <stdio.h>
#include <string.h>
#include <alloc.h>
int main(void)
{
char *string1 = "1234567890";
char *string2 = "747DC8";
int length;
length = strcspn(string1, string2);
printf("Character where strings intersect is at position %d\n", length);
return 0;
}
ㄧ计: strdup
: 盢﹃ī穝竚矪
ノ 猭: char *strdup(char *str);
祘ㄒ:
#include <stdio.h>
#include <string.h>
#include <alloc.h>
int main(void)
{
char *dup_str, *string = "abcde";
dup_str = strdup(string);
printf("%s\n", dup_str);
free(dup_str);
return 0;
}
ㄧ计: stricmp
: 糶ぃ庇稰よΑゑ耕ㄢ﹃
ノ 猭: int stricmp(char *str1, char *str2);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *buf1 = "BBB", *buf2 = "bbb";
int ptr;
ptr = stricmp(buf2, buf1);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1\n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1\n");
if (ptr == 0)
printf("buffer 2 equals buffer 1\n");
return 0;
}
ㄧ计: strerror
: 岿粇獺才﹃皐
ノ 猭: char *strerror(int errnum);
祘ㄒ:
#include <stdio.h>
#include <errno.h>
int main(void)
{
char *buffer;
buffer = strerror(errno);
printf("Error: %s\n", buffer);
return 0;
}
ㄧ计: strcmpi
: 盢﹃籔ゑ耕, ぃ恨糶
ノ 猭: int strcmpi(char *str1, char *str2);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *buf1 = "BBB", *buf2 = "bbb";
int ptr;
ptr = strcmpi(buf2, buf1);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1\n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1\n");
if (ptr == 0)
printf("buffer 2 equals buffer 1\n");
return 0;
}
ㄧ计: strncmp
: ﹃ゑ耕
ノ 猭: int strncmp(char *str1, char *str2, int maxlen);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *buf1 = "aaabbb", *buf2 = "bbbccc", *buf3 = "ccc";
int ptr;
ptr = strncmp(buf2,buf1,3);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1\n");
else
printf("buffer 2 is less than buffer 1\n");
ptr = strncmp(buf2,buf3,3);
if (ptr > 0)
printf("buffer 2 is greater than buffer 3\n");
else
printf("buffer 2 is less than buffer 3\n");
return(0);
}
ㄧ计: strncmpi
: р﹃い场だ籔﹃い场だゑ耕, ぃ恨糶
ノ 猭: int strncmpi(char *str1, char *str2);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *buf1 = "BBBccc", *buf2 = "bbbccc";
int ptr;
ptr = strncmpi(buf2,buf1,3);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1\n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1\n");
if (ptr == 0)
printf("buffer 2 equals buffer 1\n");
return 0;
}
ㄧ计: strncpy
: ﹃ī
ノ 猭: char *strncpy(char *destin, char *source, int maxlen);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char string[10];
char *str1 = "abcdefghi";
strncpy(string, str1, 3);
string[3] = '\0';
printf("%s\n", string);
return 0;
}
ㄧ计: strnicmp
: ぃ猔糶ゑ耕ㄢ﹃
ノ 猭: int strnicmp(char *str1, char *str2, unsigned maxlen);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *buf1 = "BBBccc", *buf2 = "bbbccc";
int ptr;
ptr = strnicmp(buf2, buf1, 3);
if (ptr > 0)
printf("buffer 2 is greater than buffer 1\n");
if (ptr < 0)
printf("buffer 2 is less than buffer 1\n");
if (ptr == 0)
printf("buffer 2 equals buffer 1\n");
return 0;
}
ㄧ计: strnset
: 盢﹃い┮Τ才常砞﹚才
ノ 猭: char *strnset(char *str, char ch, unsigned n);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz";
char letter = 'x';
printf("string before strnset: %s\n", string);
strnset(string, letter, 13);
printf("string after strnset: %s\n", string);
return 0;
}
ㄧ计: strpbrk
: ﹃い琩т倒﹚才栋い才
ノ 猭: char *strpbrk(char *str1, char *str2);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char *string1 = "abcdefghijklmnopqrstuvwxyz";
char *string2 = "onm";
char *ptr;
ptr = strpbrk(string1, string2);
if (ptr)
printf("strpbrk found first character: %c\n", *ptr);
else
printf("strpbrk didn't find character in set\n");
return 0;
}
ㄧ计: strrchr
: ﹃い琩т﹚才程瞷
ノ 猭: char *strrchr(char *str, char c);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char string[15];
char *ptr, c = 'r';
strcpy(string, "This is a string");
ptr = strrchr(string, c);
if (ptr)
printf("The character %c is at position: %d\n", c, ptr-string);
else
printf("The character was not found\n");
return 0;
}
ㄧ计: strrev
: ﹃锣
ノ 猭: char *strrev(char *str);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char *forward = "string";
printf("Before strrev(): %s\n", forward);
strrev(forward);
printf("After strrev(): %s\n", forward);
return 0;
}
ㄧ计: strset
: 盢﹃い┮Τ才常砞﹚才
ノ 猭: char *strset(char *str, char c);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char string[10] = "123456789";
char symbol = 'c';
printf("Before strset(): %s\n", string);
strset(string, symbol);
printf("After strset(): %s\n", string);
return 0;
}
ㄧ计: strspn
: ﹃い琩т﹚才栋栋材Ω瞷
ノ 猭: int strspn(char *str1, char *str2);
祘ㄒ:
#include <stdio.h>
#include <string.h>
#include <alloc.h>
int main(void)
{
char *string1 = "1234567890";
char *string2 = "123DC8";
int length;
length = strspn(string1, string2);
printf("Character where strings differ is at position %d\n", length);
return 0;
}
ㄧ计: strstr
: ﹃い琩т﹚才﹃材Ω瞷
ノ 猭: char *strstr(char *str1, char *str2);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char *str1 = "Borland International", *str2 = "nation", *ptr;
ptr = strstr(str1, str2);
printf("The substring is: %s\n", ptr);
return 0;
}
ㄧ计: strtod
: 盢才﹃锣传double
ノ 猭: double strtod(char *str, char **endptr);
祘ㄒ:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
char input[80], *endptr;
double value;
printf("Enter a floating point number:");
gets(input);
value = strtod(input, &endptr);
printf("The string is %s the number is %lf\n", input, value);
return 0;
}
ㄧ计: strtok
: 琩тパ材﹃い﹚だ才だ筳秨虫迭
ノ 猭: char *strtok(char *str1, char *str2);
祘ㄒ:
#include <string.h>
#include <stdio.h>
int main(void)
{
char input[16] = "abc,d";
char *p;
/* strtok places a NULL terminator
in front of the token, if found */
p = strtok(input, ",");
if (p) printf("%s\n", p);
/* A second call to strtok using a NULL
as the first parameter returns a pointer
to the character following the token */
p = strtok(NULL, ",");
if (p) printf("%s\n", p);
return 0;
}
ㄧ计: strtol
: 盢﹃锣传俱计
ノ 猭: long strtol(char *str, char **endptr, int base);
祘ㄒ:
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
char *string = "87654321", *endptr;
long lnumber;
/* strtol converts string to long integer */
lnumber = strtol(string, &endptr, 10);
printf("string = %s long = %ld\n", string, lnumber);
return 0;
}
ㄧ计: strupr
: 盢﹃い糶ダ锣传糶ダ
ノ 猭: char *strupr(char *str);
祘ㄒ:
#include <stdio.h>
#include <string.h>
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz", *ptr;
/* converts string to upper case characters */
ptr = strupr(string);
printf("%s\n", ptr);
return 0;
}
ㄧ计: swab
: ユ传竊
ノ 猭: void swab (char *from, char *to, int nbytes);
祘ㄒ:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
char source[15] = "rFna koBlrna d";
char target[15];
int main(void)
{
swab(source, target, strlen(source));
printf("This is target: %s\n", target);
return 0;
}
ㄧ计: system
: 祇DOS㏑
ノ 猭: int system(char *command);
祘ㄒ:
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
printf("About to spawn command.com and run a DOS command\n");
system("dir");
return 0;
}
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