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Copy pathstringTest.cpp
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75 lines (72 loc) · 1.28 KB
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Copy pathstringTest.cpp
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75 lines (72 loc) · 1.28 KB
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#include <iostream>
using namespace std;
/**
*\brief 拷贝函数实现
*/
const char* strcopy(char*des,const char *src)
{
char *ret = des;
if(des && src)
{
while(*(des++) = *(src++))
;
}
return ret;
}
/**
*\brief 字符一次循环移动，默认为右移
*/
void swapChar(char *src,bool right=true)
{
if(src && strlen(src))
{
int len = strlen(src);
if(right)
{
char temp = src[len-1];
for(int i=len-1;i>0;--i)
src[i] = src[i-1];
src[0] = temp;
}
else
{
char temp = *src;
for(int i=1;i<len;++i)
src[i-1] = src[i];
src[len-1] = temp;
}
}
}
/**
*\brief 字符串循环移动
*/
void loopRMove(char *src,int step)
{
if(src && step>0)
{
int len = strlen(src);
int loop = step%len;
if(0 == len || 0 == loop)
return;
while(loop--)
swapChar(src);
}
}
int main()
{
string str1 = "hello world";
string str2 = str1;
printf ("Sharing the memory:\n");
printf ("\tstr1's address: %x\n", str1.c_str() );
cout<<str1.c_str()<<endl;
printf ("\tstr2's address: %x\n", str2.c_str() );
cout<<str2.c_str()<<endl;
str1[1]='q';
str2[1]='w';
printf ("\fter Copy-On-Write:\n");
printf ("\tstr1's address: %x\n", str1.c_str() );
cout<<str1.c_str()<<endl;
printf ("\tstr2's address: %x\n", str2.c_str() );
cout<<str2.c_str()<<endl;
return 0;
}