一个C++问题~~~

问题是:重载函数K,功能是输出一个字符串的后4位并比较它们是否相同?

这是我们的C++作业,因为是第一节课 而且老师也讲的好浮 所以都不是很明白 还请会做的朋友给个解 (最好是带步骤和解释的,因为我还都不懂啊) 另外 如果能给点学C++的建议就更是不胜感激了

#include <iostream>

#include <string>

#include <cstdlib>

#include <iomanip>

using namespace std;

bool K(const char* chars)

{

string str(chars);

string ::const_iterator it = str.end() - 4;

bool flag = true;

char ch = *it;

for(int i = 0; i < 4; ++i)

{

if(*it != ch)

flag = false;

cout << *it++;

}

return flag;

}

bool K(const string& str)

{

string ::const_iterator it = str.end() - 4;

bool flag = true;

char ch = *it;

for(int i = 0; i < 4; ++i)

{

if(*it != ch)

flag = false;

cout << *it++;

}

return flag;

}

bool K(const int num)

{

char chars[32];

string str(_itoa(num, chars, 10));

string ::const_iterator it = str.end() - 4;

bool flag = true;

char ch = *it;

for(int i = 0; i < 4; ++i)

{

if(*it != ch)

flag = false;

cout << *it++;

}

return flag;

}

bool K(const unsigned num)

{

char chars[32];

string str(_itoa(num, chars, 10));

string ::const_iterator it = str.end() - 4;

bool flag = true;

char ch = *it;

for(int i = 0; i < 4; ++i)

{

if(*it != ch)

flag = false;

cout << *it++;

}

return flag;

}

int main()

{

ios::fmtflags OldFlag = cout.flags();

cout.setf(ios_base::boolalpha | ios_base::left);

cout << setw(10) << " jimmyi: "; cout << ' ' << K("jimmyi") << endl;

cout << setw(10) << " jimmmm: "; cout << ' ' << K("jimmmm") << endl;

cout << setw(10) << " 123456: "; cout << ' ' << K(unsigned(123456)) << endl;

cout << setw(10) << " 110000: "; cout << ' ' << K(unsigned(110000)) << endl;

cout << setw(10) << "-123456: "; cout << ' ' << K(-123456) << endl;

cout << setw(10) << "-110000: "; cout << ' ' << K(-110000) << endl;

cout.setf(OldFlag);

}

输出：

jimmyi: mmyi false

jimmmm: mmmm true

123456: 3456 false

110000: 0000 true

-123456: 3456 false

-110000: 0000 true

Press any key to continue ...

建议：

书：

另外：

坚持...