c字符串长度函数的三种方法实例代码# include iostream # include cstring//调用strlen ()函数包含此文件using namespace std; intmain((stringstr='teststring '; char * ch=(char * (持续时间51 ); char const *ch2='Are you OK!' 需要强制进行类型转换; cout str.size () endl; cout str.length () endl; coutStrlen(ch ) endl; CoutStrlen(ch2 ) endl; 返回0; }打印结果