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("%s\n", 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("%s\n", destination);
return 0;
}
函数名: strchr
功能: 在一个串中查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>
{
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;
}
函数名: strcmp
功能: 串比较
字符串长度函数是什么用法: 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>
{
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;
}
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 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;
}
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("%s\n", string);
return 0;
}
函数名: strcspn
功能: 在串中查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>

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