uva 621 Secret Research

Secret Research 

At a certain laboratory results of secret research are thoroughly encrypted. A result of a single experiment is stored as an information of its completion:

`positive result', `negative result', `experiment failed' or `experiment not completed'

The encrypted result constitutes a string of digits S, which may take one of the following forms:

positive result 		 S = 1 or S = 4 or S = 78 

negative result 		 S = S35 

experiment failed 		 S = 9S4 

experiment not completed 		 S = 190S

(A sample result S35 means that if we add digits 35 from the right hand side to a digit sequence then we shall get the digit sequence corresponding to a failed experiment)

You are to write a program which decrypts given sequences of digits.

Input 

A integer n stating the number of encrypted results and then consecutive nlines, each containing a sequence of digits given as ASCII strings.

Output 

For each analysed sequence of digits the following lines should be sent to output (in separate lines):

		 + 		  for a positive result
		 - 		  for a negative result
		 * 		  for a failed experiment
		 ? 		  for a not completed experiment

In case the analysed string does not determine the experiment result, a first match from the above list should be outputted.

Sample Input 

4
78
7835
19078
944

Sample Output 

+
-
?
*

---

Miguel A. Revilla
2000-01-10

话说这道水题开始没看懂。。。。不多说，看代码就可以看懂

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>

using namespace std;

int main(void)
{
    char a[1000];

    while (cin >> a)
    {
        int len = strlen(a);
        if (!strcmp(a, "1") || !strcmp(a, "4") || !strcmp(a, "78"))
            cout << '+' << endl;
        else
        {
            if (a[len-1] == '5' && a[len-2] == '3') cout << '-' << endl;
            else if (a[len-1] == '4' & a[0] == '9') cout << '*' << endl;
            else if (a[0] == '1' && a[1] == '9' && a[2] == '0') cout <<'?'
            << endl;
        }
    }

    return 0;
}