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In this tutorial, we will write a C++ program to display pascal’s triangle. Before that, you may go through the following topic in C++.

• for loop in C++

C++ Program to display Pascal Triangle

C++ program to print pascal’s triangle: The program takes the user input for the number of rows the user wants in a pascal triangle and by nesting the for loop, the program displays the triangle.

#include <iostream>
using namespace std;

int main()
{
  int rows, i, j, k;
  cout << "Enter the number of rows: ";
  cin >> rows;

  for (i = 0; i < rows; i++)
  {
    int val = 1;
    for (j = 1; j < (rows - i); j++)
      cout << "   ";

    for (k = 0; k <= i; k++)
    {
      cout << "      " << val;
      val = val *(i - k) / (k + 1);
    }

    cout << endl << endl;
  }

  return 0;
}

Output:

Enter the number of rows: 6
                     1

                  1      1

               1      2      1

            1      3      3      1

         1      4      6      4      1

      1      5      10      10      5      1

In this tutorial, we will learn and write a program to find the sum of GP series in C++. Before that, you may go through the following topics in C++ programming:

• C++ loops

The program takes the first term, the common ratio and the number of terms as input and calculates the GP on a separate function.

C++ Program to Calculate Sum of Geometric Progression

#include <iostream>
using namespace std;

void gpFunc(float, float, int);

int main()
{
  int n;
  float a, r;

  cout << "Enter the first term (a): ";
  cin >> a;

  cout << "Enter the common ratio (r): ";
  cin >> r;

  cout << "Enter the no. of terms (n): ";
  cin >> n;

  //calling function
  gpFunc(a, r, n);
}

void gpFunc(float a, float r, int n)
{
  float sum = 0, temp = a;

  for (int i = 1; i < n; i++)
  {
    sum = sum + temp;
    temp = temp * r;
  }

  cout << "\nSum of geometric progression: " << sum;
}

Output:

Enter the first term (a): 1
Enter the common ratio (r): 2
Enter the no. of terms (n): 10

Sum of geometric progression: 511

In this tutorial, we will learn and write a program to find the transpose of matric in C++. Before that, you may go through the following topics in C++ programming:

• C++ Arrays
• C++ loops

The program takes the user input for the number of rows and columns and then the elements for the matrix.

C++ Program to find the Transpose of a Matrix

Program: Transpose of a matrix in C++ using array.

#include <iostream>
using namespace std;

int main()
{
  int arr[10][10], trans[10][10], row, col, i, j;

  cout << "Enter the no. of rows: ";
  cin >> row;
  cout << "Enter the no. of columns: ";
  cin >> col;

  //get matrix elements
  cout << "Enter the elements: " << endl;
  for (i = 0; i < row; i++)
  {
    for (j = 0; j < col; j++)
      cin >> arr[i][j];
  }

  // transpose computation
  for (i = 0; i < row; ++i)
    for (j = 0; j < col; ++j)
      trans[j][i] = arr[i][j];

  //Displaying the result
  cout << "\nTranspose result:" << endl;
  for (int i = 0; i < col; ++i)
    for (int j = 0; j < row; ++j)
    {
      cout << " " << trans[i][j];
      if (j == row - 1)
        cout << endl << endl;
    }

  return 0;
}

Output:

Enter the no. of rows: 3
Enter the no. of columns: 3
Enter the elements:
1 2 3
4 5 6
7 8 9

Transpose result:
1 4 7
2 5 8
3 6 9

Let us learn how to split string in C++ programming language. We will look at a few ways to split a string.

The splitting of string refers to the grouping of sentences into their individual single word. And splitting is possible only when there is a presence of some delimiters like white space ( ), comma (,), etc. Although there is no straight way to do this as there is no inbuilt function through which we can easily split the string. Hence, we will look at different techniques to split the string in C++.

Different ways of splitting of string in Cpp.

1. Use strtok() function to split strings

How to use strtok: strtok() function splits the string based on some delimiter. We need to pass the string and the delimiter to this function as shown in the example below.

Syntax for strtok():

char *ptr = strtok( str, delim)  

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
  char str[100];

  cout << "Enter a string: ";
  cin.getline(str, 100);

  char *ptr;
  ptr = strtok(str, ", ");

  cout << "\nAfter splitting: " << endl;
  while (ptr != NULL)
  {
    cout << ptr << endl;
    ptr = strtok(NULL, ", ");
  }

  return 0;
}

Output:

Enter a string: This is simple2code.com website

After splitting:
This
is
simple2code.com
website

2. Use std::getline() function to split string

This is another inbuilt function in C++ that extracts characters from the istream object and stores them into a specified stream until the delimitation character is found.

getline() function is present in <string> header file. It takes three parameters: string, token, and delimiter.

Syntax for getline():

getline(str, token, delim); 

#include <iostream>
#include <string>
#include <vector>
#include <sstream>
using namespace std;

int main()
{
  string str, tok;

  cout << "Enter a string: ";
  getline(cin, str);

  // S refers the string str
  stringstream S(str);

  //while loop to iterate and print words
  while (getline(S, tok, ' '))
  {
    cout << tok << endl; 
  }

  return 0;
}

Output:

Enter a string: This is a coding website
This
is
a
coding
website

In this tutorial, we will learn and write a C++ program to find the average of numbers using an array. To understand the coding, you should have knowledge of the following topics in C++ programming:

• C++ Arrays
• C++ loops

The program takes the user input for the number of elements the user wants and the values of those elements. Based on those values, an average is calculated.

C++ Program to calculate Average of /numbers using Arrays

#include <iostream>
using namespace std;

int main()
{
  int arrNum[200], i, n, sum = 0;
  float avg;

  cout << "Enter number of elements: ";
  cin >> n;

  // check whether n lies within 1 to 200
  while (n > 200 || n <= 0)
  {
    cout << "Error! number should in range of (1 to 100)." << endl;
    cout << "Enter the number again: ";
    cin >> n;
  }

  cout << "Enter " << n << " elements" << endl;
  for (i = 0; i < n; i++)
    cin >> arrNum[i];

  for (i = 0; i < n; i++)
    sum += arrNum[i];

  avg = (float) sum / n;
  cout << "Average of " << n << " numbers: " << avg;

  return 0;
}

Output:

Enter number of elements: 4
Enter 4 elements
10
20
30
40
Average of 4 numbers: 25

In this tutorial, we will learn and write a C++ program to print the multiplication of two matrices. Before that, you may go through the following topics in C++ programming:

• C++ Arrays
• C++ loops

The program takes the user input for the number of rows and columns and then the elements for both the matrices.

C++ Program to Multiply Two Matrix Using Multi-dimensional Arrays

Multiplication of matrix in C++.

#include <iostream>
using namespace std;
int main()
{
  int a[10][10], b[10][10], mul[10][10];
  int row, col, i, j, k;
  
  cout << "Enter the no. of rows: ";
  cin >> row;
  cout << "Enter the no. of columns: ";
  cin >> col;
  
  // 1st matrix user input
  cout << endl << "Enter 1st Matrix elements: " << endl;
  for (i = 0; i < row; i++)
  {
    for (j = 0; j < col; j++)
      cin >> a[i][j];
  }

  // 2nd matrix user input
  cout << endl << "Enter 2nd Matrix elements: " << endl;
  for (i = 0; i < row; i++)
  {
    for (j = 0; j < col; j++)
      cin >> b[i][j];
    
  }
  
 // matrix multiplication
  for (i = 0; i < row; i++)
  {
    for (j = 0; j < col; j++)
    {
      mul[i][j] = 0;
      for (k = 0; k < col; k++)
        mul[i][j] += a[i][k] *b[k][j];
      
    }
  }

 //Displaying the result
  cout << "Multiplication of matrix" << endl;   
  for (i = 0; i < row; i++)
  {
    for (j = 0; j < col; j++)
      cout << mul[i][j] << " ";

    cout << "\n";
  }

  return 0;
}

Output:

Enter the no. of rows: 3
Enter the no. of columns: 3

Enter 1st Matrix elements:
2 3 6
2 3 6
2 3 6

Enter 2nd Matrix elements:
1 2 3
1 2 3
1 2 3
Multiplication of matrix
11 22 33
11 22 33
11 22 33

In this tutorial, we will write a C++ program to find the difference between two time periods. Before that, you may go through the following topic in C++.

• if statement in C++
• C++ structures

We will look at two different programs:

• Using if statement
• Using Structure

C++ Program to Calculate Difference Between Two Time Periods

#include <iostream>
using namespace std;

int main()
{
  int hour1, minute1, second1;
  int hour2, minute2, second2;
  int diff_in_hour, diff_in_minute, diff_in_second;

  cout << "Enter the first time period:" << endl;
  cout << "Hours, Minutes and Seconds respectively: " << endl;
  cin >> hour1 >> minute1 >> second1;

  cout << "Enter the second time period:" << endl;
  cout << "Hours, Minutes and Seconds respectively: " << endl;
  cin >> hour2 >> minute2 >> second2;

  if (second2 > second1)
  {
    minute1--;
    second1 += 60;
  }

  diff_in_second = second1 - second2;

  if (minute2 > minute1)
  {
    hour1--;
    minute1 += 60;
  }

  diff_in_minute = minute1 - minute2;

  diff_in_hour = hour1 - hour2;

  cout << "Time Difference between above two time period is: " << endl;
  cout << diff_in_hour << "hr " << diff_in_minute << "min " << diff_in_second << "sec";

  return 0;
}

Output:

Hours, Minutes and Seconds respectively:
8
25
68
Enter the second time period:
Hours, Minutes and Seconds respectively:
7
20
25
Time Difference between above two time period is:
1hr 5min 43sec

C++ Program to find difference between two time period using structure

#include <iostream>
using namespace std;

struct Time
{
  int hours;
  int minutes;
  int seconds;
};

//Function to compute the difference in time periods
void differenceFunction(struct Time tp1, struct Time tp2, struct Time *difference)
{

  if (tp2.seconds > tp1.seconds)
  {
    --tp1.minutes;
    tp1.seconds += 60;
  }

  difference->seconds = tp1.seconds - tp2.seconds;
  if (tp2.minutes > tp1.minutes)
  {
    --tp1.hours;
    tp1.minutes += 60;
  }
  difference->minutes = tp1.minutes - tp2.minutes;
  difference->hours = tp1.hours - tp2.hours;
}

//main function
int main()
{
  struct Time tp1, tp2, difference;

  cout << "Enter the first time period:" << endl;
  cout << "Hours, Minutes and Seconds respectively: " << endl;
  cin >> tp1.hours >> tp1.minutes >> tp1.seconds;

  cout << "Enter the second time period:" << endl;
  cout << "Hours, Minutes and Seconds respectively: " << endl;
  cin >> tp2.hours >> tp2.minutes >> tp2.seconds;

  differenceFunction(tp1, tp2, &difference);

  cout << endl << "Time Difference: " << tp1.hours << ":" << tp1.minutes << ":" << tp1.seconds;
  cout << " - " << tp2.hours << ":" << tp2.minutes << ":" << tp2.seconds;
  cout << " = " << difference.hours << ":" << difference.minutes << ":" << difference.seconds;
  return 0;
}

Output:

Enter the first time period:
Hours, Minutes and Seconds respectively:
10
20
50
Enter the second time period:
Hours, Minutes and Seconds respectively:
7
30
30

Time Difference: 10:20:50 - 7:30:30 = 2:50:20

In this tutorial, we will write a program to store information of a student in a Structure in C++. You may go through the following topics first.

• C++ Structures

C++ program using structure.

#include <iostream>
using namespace std;

//creating the structure
struct student
{
    char name[50];
    int roll;
    float marks;
    char grade;
};

//main
int main() 
{
    student std;
    cout << "Enter your Detail:" << endl;
    cout << "Name: ";
    cin >> std.name;
    cout << "Roll Number: ";
    cin >> std.roll;
    cout << "Marks: ";
    cin >> std.marks;
    cout << "Grade: ";
    cin >> std.grade;

    cout << "\nDisplaying Information," << endl;
    cout << "Name: " << std.name << endl;
    cout << "Roll: " << std.roll << endl;
    cout << "Marks: " << std.marks << endl;
    cout << "Grade: " << std.grade << endl;
    return 0;
}

Output:

Enter your Detail:
Name: Pushpa
Roll Number: 1101
Marks: 80
Grade: A

Displaying Information,
Name: Pushpa
Roll: 1101
Marks: 80
Grade: A

In this tutorial, we will write a neon number program in Cpp. We will write two different programs.

1. Check for neon number
2. Display the neon number within the range

Neon Numbers

A number is said to be a neon number if the sum of the digits of a square of the number is equal t the original number.

Example: 9 is a Neon number (see explanation in the diagram).

Neon Number in C++

C++ Program to check for neon numbers.

//Cpp Program to check whether a given number is a Neon number or not
#include <iostream>
using namespace std;

int main()
{
  int num;

  cout << "Enter the number: ";
  cin >> num;

  int square = num * num;
  int sum = 0;

  while (square > 0)
  {
    int lastDigit = square % 10;
    sum = sum + lastDigit;
    square = square / 10;
  }

  if (sum == num)
    cout << num << " is a Neon number";
  else
    cout << num << " is NOT a Neon number";

  return 0;
}

Output:

Enter the number: 9
9 is a Neon number

C++ program to display all the neon number within a given range

//Cpp Program to check whether a given number is a Neon number or not
#include <iostream>
using namespace std;

int checkForNeon(int x)
{
  int square = x * x;
  int sumOfDigits = 0;

  while (square != 0)
  {
    sumOfDigits = sumOfDigits + square % 10;
    square /= 10;
  }

  return (sumOfDigits == x);
}

// Main function
int main(void)
{
  int lowestNum, highestNum;

  cout << "ENTER THE STARTING AND FINAL NUMBER FOR THE RANGE TO CHECK\n";

  cout << "\nEnter the lowest number: ";
  cin >> lowestNum;

  cout << "Enter the Highest number: ";
  cin >> highestNum;

  cout << "\nNeon Number between them are:";
  for (int i = lowestNum; i <= highestNum; i++)
  {
    if (checkForNeon(i))
      cout << i << " ";
  }
}

Output:

ENTER THE STARTING AND FINAL NUMBER FOR THE RANGE TO CHECK

Enter the lowest number: 1
Enter the Highest number: 2000

Neon Number between them are:1 9