The Decoder

Write a complete program that will correctly decode a set of characters into a valid message. Your
program should read a given file of a simple coded set of characters and print the exact message that
the characters contain. The code key for this simple coding is a one for one character substitution
based upon a single arithmetic manipulation of the printable portion of the ASCII character set.
Input and Output
For example: with the input file that contains:
1JKJ’pz’{ol’{yhklthyr’vm’{ol’Jvu{yvs’Kh{h’Jvywvyh{pvu5
1PIT’pz’h’{yhklthyr’vm’{ol’Pu{lyuh{pvuhs’I|zpulzz’Thjopul’Jvywvyh{pvu5
1KLJ’pz’{ol’{yhklthyr’vm’{ol’Kpnp{hs’Lx|pwtlu{‘Jvywvyh{pvu5
your program should print the message:
*CDC is the trademark of the Control Data Corporation.
*IBM is a trademark of the International Business Machine Corporation.
*DEC is the trademark of the Digital Equipment Corporation.
Your program should accept all sets of characters that use the same encoding scheme and should
print the actual message of each set of characters.
Sample Input
1JKJ’pz’{ol’{yhklthyr’vm’{ol’Jvu{yvs’Kh{h’Jvywvyh{pvu5
1PIT’pz’h’{yhklthyr’vm’{ol’Pu{lyuh{pvuhs’I|zpulzz’Thjopul’Jvywvyh{pvu5
1KLJ’pz’{ol’{yhklthyr’vm’{ol’Kpnp{hs’Lx|pwtlu{'Jvywvyh{pvu5
Sample Output
*CDC is the trademark of the Control Data Corporation.
*IBM is a trademark of the International Business Machine Corporation.
*DEC is the trademark of the Digital Equipment Corporation.
代码

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    while(getline(cin,s))
    {
        for(int i=0;i<s.size();i++)
            cout<<char(s[i]-7);
        cout<<endl;
    }
    return 0;
}