LinuxC:sizeof,strlen

 

#include <stdio.h>#include <string.h>void func(char* str){ printf("sizeof(str):%d/t",sizeof(str)); printf("strlen:%d/t",strlen(str));}void main(){ char a[]="123456789"; printf("a[]:%d/t",sizeof(a)); func(a);} 

output:

a[]:10 sizeof(str):4 strlen:9

sizeof:计算所占的内存空间，用字节数表示。

strlen:

The  strlen()  function  calculates  the  length  of  the string s, not   including the terminating '/0' character.