458 - The Decoder

 

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 asingle 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{pvu51PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu51KLJ'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{pvu51PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu51KLJ'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.

 

 

 

 

#include "iostream"
#include "cstdio"

using namespace std;

int main()
{
   char c;
    while ((c = getchar()) != EOF)
 {
        if (c != '\n') putchar(c-7);
            else putchar(c);
 }

 return 0;
}

 

 

就是字符的c-7，这个简单，

问题在于后面，

但如果用cin>>c;

这样的话就也无法读取 “space ”  "table" "\n", 等字符。 题目中要求全部字符都能识别， 因此， 要读取到“space ”  "table" "\n",

就用getchat();