adding cs142 code

cs142/lab04/Makefile

@@ -0,0 +1,7 @@
+CXXFLAGS=-Wall -g -std=c++0x
+all: number
+clean:
+	rm -vf number
+
+test: all
+	./number

cs142/lab04/loops.py

@@ -0,0 +1,53 @@
+import random
+import time
+
+
+def get_numbers(pow2, compliment):
+    numbers = []
+    constant = compliment
+    for i in (0, 1):
+        for j in (0, 1):
+            for k in (0, 1):
+                for l in (0, 1):
+                    if pow2 == 0:
+                        cur_digits = (i, j, k, l, constant)
+                    if pow2 == 1:
+                        cur_digits = (i, j, k, constant, l)
+                    if pow2 == 2:
+                        cur_digits = (i, j, constant, k, l)
+                    if pow2 == 3:
+                        cur_digits = (i, constant, j, k, l)
+                    if pow2 == 4:
+                        cur_digits = (constant, i, j, k, l)
+                    numbers.append(cur_digits)
+    return numbers
+
+print "example of how to use randomness to determine compliment"
+a_few_tries = xrange(3)
+for i in a_few_tries:
+    compliment = random.randint(0, 3026) % 2
+    for i in get_numbers(pow2=0, compliment=compliment):
+        print i
+
+print "for loop to print out all numbers from 2^0 to 2^5"
+for i in (0, 1):
+    for j in (0, 1):
+        for k in (0, 1):
+            for l in (0, 1):
+                for m in (0, 1):
+                    for n in (0, 1):
+                        print i, j, k, l, m
+
+print "example function to convert a string in binary to integers: (see source)"
+def bin2int(s):
+    total = 0
+    for i in xrange(len(s)):
+        if s[i] == '1':
+            total += 2**(len(s) - i - 1)
+    return total
+
+
+print "here I test out the bin2int func defined above:"
+test_cases = ('1010', '1011', '0100', '1000', '0111')
+for test in test_cases:
+    print test, bin2int(test), int(test, 2)

cs142/lab04/number.cpp

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+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <time.h>
+#include <sstream>
+#include <cmath>
+#include <algorithm>
+
+using namespace std;
+
+int bit2dec(string s); 
+
+vector<int> get_numbers(int pow, int compliment) {
+    string store;
+    vector<int> numbers;
+    int constant = compliment;
+    for(int i = 0; i < 2; i++){
+        for(int j = 0; j < 2; j++){
+            for(int k = 0; k < 2; k++){
+                for(int l = 0; l < 2; l++){
+                    ostringstream stream;
+                    if(pow == 0){
+                        stream << i << j << k << l << constant;
+                    }
+                    else if(pow == 1){
+                        stream << i << j << k << constant << l;
+                    }
+                    else if(pow == 2){
+                        stream << i << j << constant << k << l;
+                    }
+                    else if(pow == 3){
+                        stream << i << constant << j << k << l;
+                    }
+                    else if(pow == 4){
+                        stream << constant << i << j << k << l;
+                    }
+                    store = stream.str();
+                    numbers.push_back(bit2dec(store));
+                }
+            }
+        }
+    }
+    return numbers;
+}
+
+
+ostream & operator<<(ostream & os, const vector<int> & nums) {
+    for(unsigned int i = 0; i < nums.size(); i++){
+        if(i % 4 == 0){
+        os << endl;
+        }
+        os << nums[i] << " ";
+    }
+    return os;
+}
+
+int bit2dec(string s) {
+
+    int total = 0;
+    int power = 0;
+    for(int i = s.size() - 1; i >= 0; i--) {
+        if(s[i] == '1') {
+           total += pow(2,power);
+        }
+        power++;
+    }
+    return total;
+}
+
+
+int main() {
+
+    srand (time(NULL));
+    int keep_playing = 0;
+    while(keep_playing == 0){
+        ostringstream answer;
+        for(unsigned int i = 0; i < 5 ; i++) {
+            int switcher = rand() % 2;
+            string check;
+            cout << "Is your number in this list? enter y for yes n for no" << endl;
+            cout << get_numbers(i, switcher) << endl;
+            cin >> check;
+            if(switcher == 0){
+                if(check == "y") {
+                    answer << '0';
+                }
+                else {
+                    answer << '1';
+                }
+            }
+            if(switcher == 1) {
+                if(check == "y") {
+                    answer << '1';
+                }
+                else {
+                    answer << '0';
+                }
+            }
+        }
+        string final = answer.str();
+        reverse (final.begin(), final.end());
+        cout << bit2dec(final) << endl;
+        cout << "Do you want to keep playing? enter y for yes, n for no" << endl;
+        string check;
+        cin >> check;
+        if(check == "n"){
+            keep_playing++;
+        }
+    }
+    return 0;
+}

cs142/lab04/quick.cpp

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+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+int main() {
+
+    vector<int> numbers;
+
+    numbers.push_back(0);
+    numbers.push_back(1);
+    numbers.push_back(0);
+    numbers.push_back(1);
+    numbers.push_back(0);
+
+        cout << numbers[0] << numbers[1]<< numbers[2]<<numbers[3] << numbers[4] <<endl;
+}