c 字符串处理

程序开头要声明
#include <string.h>
 
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: %d\n", c, ptr-string);
else
printf("The character was not found\n");
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 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