day3 code

main.cpp

@@ -0,0 +1,45 @@
+#include <iostream>
+#include <vector>
+
+int main() {
+    int *p = new int[1];
+    int len = 1;
+
+    std::vector<int> v;
+    int num;
+
+    std::cout << "Please enter a number: ";
+    std::cin >> num;
+
+    v.push_back(num);  //vector append
+    p[0] = num;
+
+    while (num != 0) {
+        std::cout << "Please enter a number: ";
+        std::cin >> num;
+
+        v.push_back(num);  //vector append
+
+        // realloc
+        int* temp = new int[len + 1]; //create a new temporary array to "transport values"
+        //std::copy(p, p + len, temp);
+        for (int i = 0; i < len; i++) temp[i] = p[i]; //copy contents of current array to temp arr
+        temp[len] = num; //add new number to end of temp array
+        delete [] p; //delete (free the memory) array p in preparation for resize
+        p = temp; //set old array to the temp array
+        len++;
+    }
+
+    std::cout << "Vector: " << std::endl;
+    for (int i : v) {
+        std::cout << i << " " << std::endl;
+    }
+
+    std::cout << std::endl << "Array: " << std::endl;
+    for (int i = 0; i < len; i++) {
+        std::cout << p[i] << " " << std::endl;
+    }
+
+    delete [] p;
+    return 0;
+}