C语言字符串与指针

C语言全总字符串函数

函数名: stpcpy

功 能: 拷贝一个字符串到另一个

用 法: char *stpcpy(char *destin, char *source); 程序例:

#include <stdio.h> #include <string.h> int main(void) {

char string[10];

char *str1 = "abcdefghi"; stpcpy(string, str1); printf("%sn", string); return 0; }

函数名: strcat

功 能: 字符串拼接函数

用 法: char *strcat(char *destin, char *source); 程序例:

#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("%sn", destination); return 0; }

函数名: strchr

功 能: 在一个串中查找给定字符的第一个匹配之处 用 法: char *strchr(char *str, char c); 程序例:

#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: %dn", c, ptr-string); else

printf("The character was not foundn"); return 0; }

函数名: strcmp 功 能: 串比较

用 法: int strcmp(char *str1, char *str2);

看Asic码，str1>str2，返回值 > 0；两串相等，返回0 程序例:

#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 1n"); else

printf("buffer 2 is less than buffer 1n"); ptr = strcmp(buf2, buf3); if (ptr > 0)

printf("buffer 2 is greater than buffer 3n"); else

printf("buffer 2 is less than buffer 3n"); return 0; }

函数名: strncmpi

功 能: 将一个串中的一部分与另一个串比较, 不管大小写 用 法: int strncmpi(char *str1, char *str2, unsigned maxlen); 程序例:

#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 1n"); if (ptr < 0)

printf("buffer 2 is less than buffer 1n"); if (ptr == 0)

printf("buffer 2 equals buffer 1n"); return 0; }

函数名: strcpy 功 能: 串拷贝

用 法: char *strcpy(char *str1, char *str2); 程序例:

#include <stdio.h> #include <string.h> int main(void) {

char string[10];

char *str1 = "abcdefghi"; strcpy(string, str1); printf("%sn", string); return 0; }

函数名: strcspn

功 能: 在串中查找第一个给定字符集内容的段

用 法: int strcspn(char *str1, char *str2); 程序例:

#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 %dn", length); return 0; }

函数名: strdup

功 能: 将串拷贝到新建的位置处 用 法: char *strdup(char *str); 程序例:

#include <stdio.h> #include <string.h> #include <alloc.h> int main(void) {

char *dup_str, *string = "abcde"; dup_str = strdup(string); printf("%sn", dup_str); free(dup_str); return 0; }

函数名: stricmp

功 能: 以大小写不敏感方式比较两个串 用 法: int stricmp(char *str1, char *str2); 程序例:

#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 1n"); if (ptr < 0)

printf("buffer 2 is less than buffer 1n"); if (ptr == 0)

printf("buffer 2 equals buffer 1n"); return 0; }

函数名: strerror

功 能: 返回指向错误信息字符串的指针 用 法: char *strerror(int errnum); 程序例:

#include <stdio.h> #include <errno.h> int main(void) {

char *buffer;

buffer = strerror(errno); printf("Error: %sn", buffer); return 0; }

函数名: strcmpi

功 能: 将一个串与另一个比较, 不管大小写 用 法: int strcmpi(char *str1, char *str2); 程序例:

#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 1n"); if (ptr < 0)

printf("buffer 2 is less than buffer 1n"); if (ptr == 0)

printf("buffer 2 equals buffer 1n"); return 0; }

函数名: strncmp 功 能: 串比较

用 法: int strncmp(char *str1, char *str2, int maxlen); 程序例:

#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 1n"); else

printf("buffer 2 is less than bu …… 此处隐藏：9052字，全部文档内容请下载后查看。喜欢就下载吧 ……