字符串常用操作(strlen,strcpy,strcat,strcmp,strncpy,strncat)
#include
#include
//strlen的实现
intmystrlen(constchar*s)
{
intlen=0;
while(*s++!='\0')
{
len++;
}
returnlen;
}
//strcpy的实现
char*mystrcpy(char*dest,constchar*src)
{
char*tmp=dest;
assert((dest!=NULL)&&(s