C++ Programs

Conditional Statement

• Basic Arithamatic Operators

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  #include <iostream>
  using namespace std;
  int main()
  {
      int a, b;
      cout << "enter any number=";
      cin >> a;
      cout << "enter any number=";
      cin >> b;
      cout << "\nsum of two number="     << a + b << endl;
      cout << "diff of two number="    << a - b << endl;
      cout << "division of two number="<< a / b << endl;
      cout << "product of two number=" << a * b << endl;
      cout << "modulo of two number="  << a % b << endl;
    }

• Sum of Even/Odd

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  #include <iostream>
  using namespace std;
  int main() {
      int n, c;
      cout << "Choose\n1.for Even\n2.for Odd\n Enter(1/2): ";
      cin >> c;
      cout << "Sum upto ? terms: ";
      cin >> n;
      cout << "Sum is = " << (c==1 ? n*(n+1) : n*n) << endl;
      return 0;
  }

Loops

• A-Z Character Pattern Print

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  #include <iostream>
  using namespace std;
  int main()
  {
      int n;
      char ch = 'A';
      cout << "enter the no. of rows :";
      cin >> n;
      for (int i = 0; i < n; i++)
      {
          for (int j = 0; j < n; j++)
          {
              cout << ch << " ";
              ch++;
          }
          cout << endl;
      }
      cout << "end value of ch is =" << ch;
      return 0;
  }

• Star Matrix

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  #include <iostream>
  using namespace std;
  
  int main()
  {
      int n;
      cout << "enter n= ";
      cin >> n;
  
      for (int i = 0; i < n; i++)
      {
          for (int k = 0; k < n - i - 1; k++)
              cout << " ";
  
          for (int j = 0; j < i + 1; j++)
              cout << "*";
  
          for (int j = 1; j <= i; j++)
              cout << "*";
  
          cout << endl;
      }
  
      for (int i = 0; i < n; i++)
      {
          for (int k = 0; k < i + 1; k++)
              cout << " ";
  
          for (int j = 1; j <= n - i - 1; j++)
              cout << "*";
  
          for (int j = 1; j < n - i - 1; j++)
              cout << "*";
  
          cout << endl;
      }
  
      return 0;
  }
  

• Reverse Triangle

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  #include <iostream>
  using namespace std;
  
  int main()
  {
      int n;
      cout << "enter the no. of rows :";
      cin >> n;
  
      char ch = 'A';
  
      for (int i = 0; i < n; i++)
      {
          for (int j = 1; j < i + 1; j++)
              cout << " ";
  
          for (int j = 0; j < n - i; j++)
              cout << ch;
  
          cout << endl;
  
          ch++;
      }
  
      return 0;
  }
  

• Pyramid Pattern

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  #include <iostream>
  using namespace std;
  
  int main(){
      int n=4;
      for(int i=0;i<n;i++){
          // spaces
          for(int k=0;k<n-i-1;k++){
              cout<<" ";
          }
          // 1st triangle
          for(int j=1;j<i+1;j++){
              cout<<j;
          }
          // 2nd triangle
          for(int j=i+1;j>0;j--){
              cout<<j;
          }
          cout<<endl;
      }
      return 0;
  }
  

• Diamond Pattern

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  #include <iostream>
  using namespace std;
  
  int main()
  {
      int n = 9;
  
      // top part
      for (int i = 0; i < n; i++)
      {
          // left side spaces
          for (int k = 0; k < n - i - 1; k++)
              cout << " ";
  
          cout << "*";
  
          if (i != 0)
              // spaces in middle
              for (int j = 0; j < 2 * i - 1; j++)
                  cout << " ";
  
          cout << "*";
  
          cout << endl;
      }
  
      // bottom part
      for (int i = 0; i < n - 1; i++)
      {
          // left side spaces
          for (int k = 0; k < i + 1; k++)
          {
              cout << " ";
          }
  
          cout << "*";
  
          if (i != n - 2)
              // spaces in middle
              for (int j = 0; j < 2 * (n - i - 2) - 1; j++)
                  cout << " ";
  
          cout << "*";
  
          cout << endl;
      }
  
      return 0;
  }
  

Function

• Factorial

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  #include <iostream>
  using namespace std;
  
  int fact(int n) {
      if (n == 0 or n == 1) return 1;
      else return n * fact(n - 1);
  }
  
  int main() {
      int n;
      cout << "Enter a number: ";
      cin >> n;
      cout << "Factorial of " << n << " is " << fact(n) << endl;
      return 0;
  }
  

• Sum Of Digits

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  #include <iostream>
  using namespace std;
  
  int sumOfDigit(int n) {
      int sum_of_digit = 0;
      while (n > 0) {
          int last_digit = n % 10;
          n /= 10;
          sum_of_digit += last_digit;
      }
      return sum_of_digit;
  }
  
  int main() {
      int n;
      cout << "Enter a number: ";
      cin >> n;
      cout << "Sum of digits is: " << sumOfDigit(n) << endl;
      return 0;
  }
  

• nCr (Binomial Coefficient)

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  #include <iostream>
  using namespace std;
  
  int fact(int n) {
      if (n == 0 or n == 1) return 1;
      else return n * fact(n - 1);
  }
  
  int nCr(int n, int r) {
      int nmr = n - r;
      return fact(n) / (fact(r) * fact(nmr));
  }
  
  int main() {
      int n, r;
      cout << "Enter n: ";
      cin >> n;
      cout << "Enter r: ";
      cin >> r;
      cout << "---Factorial of--- " << nCr(n, r) << endl;
      return 0;
  }
  

• Prime Check

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  #include <iostream>
  using namespace std;
  
  bool isPrime(int n) {
      for (int i = 2; i * i <= n; i++) {
          if (n % i == 0) return false;
      }
      return n > 1;
  }
  
  int main() {
      int n;
      cout << "Enter a number: ";
      cin >> n;
      for (int i = 2; i <= n; i++) {
          if (isPrime(i)) cout << i << " ";
      }
      cout << endl;
      return 0;
  }
  

• Fibonacci

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  #include <iostream>
  using namespace std;
  
  int fib(int n) {
      if (n == 0) return 0;
      if (n == 1) return 1;
      return fib(n - 1) + fib(n - 2);
  }
  
  int main() {
      int n;
      cout << "Enter a number: ";
      cin >> n;
      cout << "---Fibonacci Series---" << endl;
      for (int i = 0; i < n; i++) {
          cout << fib(i) << " ";
      }
      cout << endl;
      return 0;
  }
  

• Reverse of Number

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  #include <iostream>
  using namespace std;
  
  int reverse(int n) {
      int rev = 0;
      while (n > 0) {
          int lastDigit = n % 10;
          rev = rev * 10 + lastDigit;
          n /= 10;
      }
      return rev;
  }
  
  int main() {
      int n;
      cout << "Enter a number: ";
      cin >> n;
      cout << "\nReverse of " << n << " is " << reverse(n) << "\n\n";
      return 0;
  }
  

OOPS

• Prime Numbers Using Class Inheritance

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  #include <iostream>
  using namespace std;
  
  class A
  {
  public:
      bool isPrime(int n)
      {
          for (int i = 2; i * i <= n; i++)
          {
              if (n % i == 0)
                  return false;
          }
          return n > 1;
      }
  };
  
  class B : public A
  {
  protected: // Changed to protected so child class can access it
      int num;
  
  public:
      void getData()
      {
          cout << "Enter a number: ";
          cin >> num;
      }
      void PrintData()
      {
          for (int i = 2; i <= num; i++) // Used the 'num' variable from the parent class
          {
              if (isPrime(i)) // Check if the number is prime
              {
                  cout << i << " ";
              }
          }
      }
  };
  
  int main()
  {
      B p;
      p.getData();
      p.PrintData();
      return 0;
  }