Merge pull request #438 from mirajkarsaurabh/mirajkarsaurabh-patch-2-1

Calculator in C++

Author: amritansh22

CalculatorInC++.c++

@@ -0,0 +1,80 @@
+// C++ program to create calculator
+
+#include <iostream>
+
+using namespace std;
+
+
+// Main program
+
+int main()
+
+{
+
+    char oper;
+
+    float a, b;
+
+     // It allow user to enter the operands
+
+    cout<<"Enter two operands: ";
+
+    cin>> a >> b;
+
+    // It allows user to enter operator i.e. +, -, *, /
+
+    cout<<"Enter operator: ";
+
+    cin>> oper;
+
+    // Switch statement begins
+
+    switch (oper)
+
+    {
+
+        // If operator is '+'
+
+        case '+':
+
+            cout << a + b;
+
+            break;
+
+        // If operator is '-'
+
+        case '-':
+
+            cout << a - b;
+
+            break;
+
+        // If operator is '*'
+
+        case '*':
+
+            cout << a * b;
+
+            break;
+
+        // If operator is '/'
+
+        case '/':
+
+            cout << a / b;
+
+            break;
+
+        // If any other operator display error message
+
+        default:
+
+            cout << "Error! Incorrect operator";
+
+            break;
+
+    }
+
+    return 0;
+
+}

SeparateEvenAndOddNumbers.cpp

@@ -0,0 +1,47 @@
+#include<iostream>
+using namespace std;
+
+void swap(int * x, int * y){
+  int t = * x;
+  * x = * y;
+  * y = t;
+}
+
+void segregate(int array[], int n){
+  int left = 0, right = n - 1;
+  while (left < right){
+    while (array[left] % 2 == 0 && left < right)
+      left++;
+    while (array[right] % 2 == 1 && left < right)
+      right--;
+    if (left < right){
+      swap( & array[left], & array[right]);
+      left++;
+      right--;
+    }
+  }
+}
+
+int main(){
+
+  int array[100], n, i;
+  cout << "Enter number of elements: ";
+  cin >> n;
+  cout << "\nEnter elements: ";
+
+  for (i = 0; i < n; i++)
+    cin >> array[i];
+
+  cout << "Original array: ";
+  for (int i = 0; i < n; i++)
+    cout << array[i] << " ";
+
+  segregate(array, n);
+  cout << "\nArray after divided: ";
+
+  for (int i = 0; i < n; i++)
+    cout << array[i] << " ";
+
+  return 0;
+
+}

SortAnUnsortedArrayInAWaveForm.c++

@@ -0,0 +1,39 @@
+#include<iostream>
+#include<algorithm>
+using namespace std;
+
+void swap(int * p, int * q){
+  int temp = * p;
+  * p = * q;
+  * q = temp;
+}
+
+void array_in_wave(int array[], int n){
+  sort(array, array + n);
+  for (int i = 0; i < n - 1; i += 2)
+    swap( & array[i], & array[i + 1]);
+}
+
+int main(){
+  int array[100], n, i;
+  cout << "Enter number of elements: ";
+  cin >> n;
+  cout << "\nEnter elements: ";
+
+  for (i = 0; i < n; i++)
+    cin >> array[i];
+
+  cout << "Original array: ";
+
+  for (int i = 0; i < n; i++)
+    cout << array[i] << " ";
+
+  array_in_wave(array, n);
+
+  cout << "\nWave form of the array is: ";
+
+  for (int i = 0; i < n; i++)
+    cout << array[i] << " ";
+
+  return 0;
+}