LR_strchr and LR_strrchr

一、strchr

char *strchr ( const char *string, int c );

strchr returns the pointer to the first occurrence of a character in a string.

strchr指向第一次出现寻找到的字符的位置

二、strrchr

（与strchr相对应的最后一个字符串）

char *strrchr ( const char *string, int c );

strrchr finds the last occurrence of a character in a string.

#include "web_api.h"

Action() {

     char *string = "His Excellency txhe Duke of Exeter";
     char *first_x, *last_x;

     first_x = (char *)strchr(string, 'x');
     lr_output_message("The first occurrence of x: %s", first_x);
     last_x = (char *)strrchr(string, 'x');
     lr_output_message("The last occurrence of x: %s", last_x);

     return 0;
}

/*
这个函数的意义是：strchr：找出从字符串开始的第一个x字符，并把
这个x和x后面的字符全部显示出来
那么strrchr就是找到从给定字符串开始最后一个x字符，并把
最后这个x和它后面的字符全部显示出来
运行结果：
Action.c(11): The first occurrence of x: xcellency txhe Duke of Exeter
Action.c(13): The last occurrence of x: xeter
*/