c语言库函数【string.h】之strlen_(const char * str)

 

c语言库函数【string.h】之strlen_(const char * str)

代码如下：

 

unsigned int strlen_(const char * str)

{

unsigned int i =0;

while(*str++)

i++;

//另外实现方法

//char * p=str; while(*p++);return (unsigned int)(p-str-1);

//char * p=str; while(*p) p++;return (unsigned int)(p-str);

 

return i;

}