//: C02:Effector.txt
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// (Should be "cpp" but I can't get it to compile with
// My windows compilers, so making it a txt file will
// keep it out of the makefile for the time being)
// Jerry Schwarz's "effectors"
#include<iostream>
#include <cstdlib>
#include <string>
#include <climits> // ULONG_MAX
using namespace std;
// Put out a portion of a string:
class Fixw {
string str;
public:
Fixw(const string& s, int width)
: str(s, 0, width) {}
friend ostream&
operator<<(ostream& os, Fixw& fw) {
return os << fw.str;
}
};
typedef unsigned long ulong;
// Print a number in binary:
class Bin {
ulong n;
public:
Bin(ulong nn) { n = nn; }
friend ostream& operator<<(ostream&, Bin&);
};
ostream& operator<<(ostream& os, Bin& b) {
ulong bit = ~(ULONG_MAX >> 1); // Top bit set
while(bit) {
os << (b.n & bit ? '1' : '0');
bit >>= 1;
}
return os;
}
int main() {
char* string =
"Things that make us happy, make us wise";
for(int i = 1; i <= strlen(string); i++)
cout << Fixw(string, i) << endl;
ulong x = 0xCAFEBABEUL;
ulong y = 0x76543210UL;
cout << "x in binary: " << Bin(x) << endl;
cout << "y in binary: " << Bin(y) << endl;
} ///:~
thinking in c++习题解答
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2008-04-18
13:29:40
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thinking in c++习题解答 （414个子文件） 
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