CCipher.cpp

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#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

class CCipher
        {
        public:
        string decode(string cipherText, int shift)
            {
                for(int i = 0; i < cipherText.size(); i++){
                    if((cipherText[i]-shift) >= 'A')
                    cipherText[i] = (cipherText[i]-shift);
                    else
                    cipherText[i] = 'Z' - (shift-(cipherText[i]-'A')-1);
//                    cout<<cipherText[i]<<endl;
                }
                return cipherText;
            }

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	public:
	void run_test(int Case) { if ((Case == -1) || (Case == 0)) test_case_0(); if ((Case == -1) || (Case == 1)) test_case_1(); if ((Case == -1) || (Case == 2)) test_case_2(); if ((Case == -1) || (Case == 3)) test_case_3(); if ((Case == -1) || (Case == 4)) test_case_4(); if ((Case == -1) || (Case == 5)) test_case_5(); }
	private:
	template <typename T> string print_array(const vector<T> &V) { ostringstream os; os << "{ "; for (typename vector<T>::const_iterator iter = V.begin(); iter != V.end(); ++iter) os << '\"' << *iter << "\","; os << " }"; return os.str(); }
	void verify_case(int Case, const string &Expected, const string &Received) { cerr << "Test Case #" << Case << "..."; if (Expected == Received) cerr << "PASSED" << endl; else { cerr << "FAILED" << endl; cerr << "\tExpected: \"" << Expected << '\"' << endl; cerr << "\tReceived: \"" << Received << '\"' << endl; } }
	void test_case_0() { string Arg0 = "VQREQFGT"; int Arg1 = 2; string Arg2 = "TOPCODER"; verify_case(0, Arg2, decode(Arg0, Arg1)); }
	void test_case_1() { string Arg0 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; int Arg1 = 10; string Arg2 = "QRSTUVWXYZABCDEFGHIJKLMNOP"; verify_case(1, Arg2, decode(Arg0, Arg1)); }
	void test_case_2() { string Arg0 = "TOPCODER"; int Arg1 = 0; string Arg2 = "TOPCODER"; verify_case(2, Arg2, decode(Arg0, Arg1)); }
	void test_case_3() { string Arg0 = "ZWBGLZ"; int Arg1 = 25; string Arg2 = "AXCHMA"; verify_case(3, Arg2, decode(Arg0, Arg1)); }
	void test_case_4() { string Arg0 = "DBNPCBQ"; int Arg1 = 1; string Arg2 = "CAMOBAP"; verify_case(4, Arg2, decode(Arg0, Arg1)); }
	void test_case_5() { string Arg0 = "LIPPSASVPH"; int Arg1 = 4; string Arg2 = "HELLOWORLD"; verify_case(5, Arg2, decode(Arg0, Arg1)); }

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        };

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    int main()
        {
        CCipher ___test;
        ___test.run_test(-1);
        }
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