Basic cpp programs

Basic C++ Programs/Array.txt

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+#include <iostream>
+using namespace std;
+
+int main() 
+{
+    int numbers[5], sum = 0;
+    cout << "Enter 5 numbers!"<<endl;
+    for (int i = 0; i < 5; ++i) 
+    {
+    	cout<<"Enter number "<<i+1<<" : ";
+        cin >> numbers[i];
+        sum += numbers[i];
+    }
+
+    cout << "Sum = " << sum << endl;  
+
+    return 0;
+}

Basic C++ Programs/Calculator.txt

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+    char o;
+    float num1, num2;
+
+    cout << "Enter an operator (+, -, *, /): ";
+    cin >> o;
+
+    cout << "Enter two operands: ";
+    cin >> num1 >> num2;
+
+    switch (o) 
+    {
+        case '+':
+            cout << num1 << " + " << num2 << " = " << num1+num2;
+            break;
+        case '-':
+            cout << num1 << " - " << num2 << " = " << num1-num2;
+            break;
+        case '*':
+            cout << num1 << " * " << num2 << " = " << num1*num2;
+            break;
+        case '/':
+            cout << num1 << " / " << num2 << " = " << num1/num2;
+            break;
+        default:
+            // if operator doesn't match any case constant (+, -, *, /)
+            cout << "Error! operator is not correct";
+            break;
+    }
+
+    return 0;
+}

Basic C++ Programs/If-else.txt

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+#include <iostream>
+using namespace std;
+
+int main() 
+{
+    int number;
+    cout << "Enter an integer: ";
+    cin >> number;
+
+    // checks if the number is positive
+    if ( number > 0) 
+    {
+        cout << "You entered a positive integer: " << number << endl;
+    }
+    else if(number==0)
+    {
+    	cout<<"You entered 0!"<<endl;
+	}
+	else{
+		cout<<"You entered a negetive integer: "<< number<<endl;
+	}
+
+    cout << "This statement is always executed.";
+    return 0;
+
+}

Basic C++ Programs/Largest element in an array.txt

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+    int i, n;
+    float arr[100];
+    cout << "Enter total number of elements(1 to 100): ";
+    cin >> n;
+    cout << endl;   
+    for(i = 0; i < n; ++i)
+    {
+       cout << "Enter Number " << i + 1 << " : ";
+       cin >> arr[i];
+    }    
+    for(i = 1;i < n; ++i)
+    {
+
+       if(arr[0] < arr[i])
+           arr[0] = arr[i];
+    }
+    cout << "Largest element = " << arr[0];
+    return 0;
+}

Basic C++ Programs/Prime or Not.txt

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+  int n, i;
+  bool isPrime = true;
+
+  cout << "Enter a positive integer: ";
+  cin >> n;
+
+  for(i = 2; i <= n / 2; ++i)
+  {
+      if(n % i == 0)
+      {
+          isPrime = false;
+          break;
+      }
+  }
+  if (isPrime)
+      cout << "This is a prime number";
+  else
+      cout << "This is not a prime number";
+
+  return 0;
+}