指针的实质是一个32位的整数，当然可以做运算。圈中的位置做运算是为了获得s1首次出现在s中的具体第几个位置。strstr如果执行失败会返回NULL，所以另一句是判断如果不失败
strstr的函数原型：extern char *strstr(char *str1, char *str2);在传入char型数组名时，会自动转换为char *指针类型。而在传入其他一维数组名，则会报错。以你上面的代码来讲：传入TC35_RE应该会报错( 应该不会typedef char uint8;)而phnum用作第二个参数则是OK的。
if (strstr(a, "ear")) // A2 return y; 和 if (strstr(a, "earth")) // B1 return x; else if (strstr(a, "ear")) // B2 return y; 就个人而言,我觉得 else 是多余的,并且阻止CPU进行分支预测。 在第一个中,当执行A1时,可以预解码A2。在第二个中,它将不会解释B2,直到B1被评估为假。
if语句是一种条件语句,用于根据条件的真假来执行不同的代码块。它是大多数编程语言中的基本语法之一,用于控制程序的流程。 if语句的基本语法通常包含一个条件表达式和一个或多个代码块。条件表达式的结果为...
Add a comment 32 Another option is to use the strstr() function. Something like: if (strlen(strstr($haystack,$needle))>0) { // Needle Found } Point to note: The strstr() function is case-sensitive. For a case-insensitive search, use the stristr() function. Share Improve this answ...
(strstr(aa,"OK")!=NULL) //检测单片机和模块的连接,连接成功返回1{g_timeout=0;return 1;}if(g_timeout>50){g_timeout=0;return -1;}g_timeout++;return 0;}void AT(void){clearBuff();Print_Str(ATE0);delay(50);while(strstr(aa,"OK")==NULL){delay(50);// ...
b-hayes dixit: The difference changes between WSLv1 and WSLv2 Could you please explain that? What exactly changes? Used to be (?) that • "Microsoft" is WSL 1 with a very high probability • "microsoft" is WSL 2 with good probability • if uname contains neither, check environment...
*/ if(!minissdpdsock) minissdpdsock = "/var/run/minissdpd.sock"; while(!devlist && deviceList[deviceIndex]) { devlist = getDevicesFromMiniSSDPD(deviceList[deviceIndex], minissdpdsock); /* We return what we have found if it was not only a rootdevice */ if(devlist && !strstr(...
11_字符串的基本操作 12_数组中括号与指针关系和数组名常量指针分析 13_字符串一级指针内存模型_传智扫地僧 14_字符串copy函数技术推演 15_字符串copy函数强化训练_判断null_引入辅助指针变量_传智扫地僧 16_项目开发模型强化_strstr_while模型_重要 17_作业考试强化一天03(day03)01...
= NULL) { Member bkueng May 15, 2024 Suggested change && strstr(file_name, "mtd_caldata") != NULL) { ) { Contributor Author asimopunov May 15, 2024 • edited The assumption was that this was only an issue for mtd_caldata, so the fix would only apply if the file_path ...