Abbreviate string

/**
 * Subject: Automata Theory and Compiler Design
 * Author: Tareq Hasan <http://tareq.weDevs.com>
 *
 * Experiment: 3
 * Write a Program that read a string and abbreviates
 *
 * Sample Input: CSE-307
 * Sample Output: Computer Science & Engineering, 3rd Year, Artifitial Inteligence
 */

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
using namespace std;

#define SUB_MAX 5

int main() {
    char input[20];

    cout << "Enter subject code: ";
    cin >> input;

    string subjects[][SUB_MAX] = {{
        "Introduction to Programming with C and C++ ",
        "Digital Systems",
        "Computer Fundamentals",
        "Electronics and Electrical Circuits",
        "English"
    }, {
        "Object Oriented Programming",
        "Data StructureJ",
        "Algorithms",
        "Computer Architecture and Organization",
        "Numerical Methods"
    }, {
        "DBMS",
        "Network",
        "Automata theory and Compiler Design",
        "Operating System",
        "Assembly Language"
    }, {
        "Digital Image Processing",
        "Computer Simulation and Modelling",
        "E-Commerce and Web Engineering",
        "Software Engineering",
        "System Analysis and Design"
    }};

    string years[] = { "1st Year", "2nd Year", "3rd Year", "4th Year" };

    char *token = strtok( input, "-" );
    while( token != NULL ) {

        if( strcmp( token, "CSE") ) {
            cout << "Computer Science & Engineering, ";
        }

        if( isdigit( token[0] ) ) {
            cout << years[token[0]-49] << ", ";
        }

        if( isdigit( token[2] ) ) {
            cout << subjects[token[0]-49][token[2]-49] << endl;
        }

        token = strtok( NULL, "-" );
    }

    return 0;
}