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Given the number of rows, the task is to print Even Number Pattern in C, C++, and Python.
Examples:
Example1:
Input:
Given number of rows = 10
Output:
20 20 18 20 18 16 20 18 16 14 20 18 16 14 12 20 18 16 14 12 10 20 18 16 14 12 10 8 20 18 16 14 12 10 8 6 20 18 16 14 12 10 8 6 4 20 18 16 14 12 10 8 6 4 2
Example2:
Input:
Given number of rows = 6
Output:
12 12 10 12 10 8 12 10 8 6 12 10 8 6 4 12 10 8 6 4 2
Program to Print Even Number Pattern in C, C++, and Python
Below are the ways to print Even Number Pattern in C, C++, and Python.
Method #1: Using For Loop (Static Input)
Approach:
- Give the number of rows as static input and store it in a variable.
- Take a variable and initialize it with 2*double the number of rows say lastnumb.
- Take another variable and initialize it with the lastnumb say evennumb.
- Loop from 1 to the number of rows using For loop.
- Initialize the evennumb with the lastnumb.
- Loop from 0 to the iterator value of the parent For loop using another for loop(Nested For loop).
- Print the evennumb.
- Reduce the evennumb by 2.
- Print the Newline character after the end of the inner loop.
- The Exit of the Program.
1) Python Implementation
Below is the implementation:
# Give the number of rows as static input and store it in a variable.
numberOfRows = 10
# Take a variable and initialize it with 2*double the number of rows say lastnumb.
lastnumb = 2*numberOfRows
# Take another variable and initialize it with the lastnumb say evennumb.
evennumb = lastnumb
# Loop from 1 to the number of rows using For loop.
for m in range(1, numberOfRows+1):
# Initialize the evennumb with the lastnumb.
evennumb = lastnumb
# Loop from 0 to the iterator value of the parent For loop using
# another for loop(Nested For loop).
for n in range(0, m):
# Print the evennumb.
print(evennumb, end=' ')
# Reduce the evennumb by 2.
evennumb = evennumb-2
# Print the Newline character after the end of the inner loop.
print()
Output:
20 20 18 20 18 16 20 18 16 14 20 18 16 14 12 20 18 16 14 12 10 20 18 16 14 12 10 8 20 18 16 14 12 10 8 6 20 18 16 14 12 10 8 6 4 20 18 16 14 12 10 8 6 4 2
2) C++ Implementation
Below is the implementation:
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
// Give the number of rows as static input and store it
// in a variable.
int numberOfRows = 8;
// Take a variable and initialize it with 2*double the
// number of rows say lastnumb.
int lastnumb = 2 * numberOfRows;
// Take another variable and initialize it with the
// lastnumb say evennumb.
int evennumb = lastnumb;
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m <= numberOfRows; m++) {
// Initialize the evennumb with the lastnumb.
evennumb = lastnumb;
// Loop from 0 to the iterator value of the parent
// For loop using
// another for loop(Nested For loop).
for (int n = 0; n < m; n++) {
// Print the evennumb.
cout << evennumb << " ";
// Reduce the evennumb by 2.
evennumb = evennumb - 2;
}
// Print the Newline character after the end of the
// inner loop.
cout << endl;
}
return 0;
}
Output:
16 16 14 16 14 12 16 14 12 10 16 14 12 10 8 16 14 12 10 8 6 16 14 12 10 8 6 4 16 14 12 10 8 6 4 2
3) C Implementation
Below is the implementation:
#include <stdio.h>
int main()
{
// Give the number of rows as static input and store it
// in a variable.
int numberOfRows = 8;
// Take a variable and initialize it with 2*double the
// number of rows say lastnumb.
int lastnumb = 2 * numberOfRows;
// Take another variable and initialize it with the
// lastnumb say evennumb.
int evennumb = lastnumb;
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m <= numberOfRows; m++) {
// Initialize the evennumb with the lastnumb.
evennumb = lastnumb;
// Loop from 0 to the iterator value of the parent
// For loop using
// another for loop(Nested For loop).
for (int n = 0; n < m; n++) {
// Print the evennumb.
printf("%d ", evennumb);
// Reduce the evennumb by 2.
evennumb = evennumb - 2;
}
// Print the Newline character after the end of the
// inner loop.
printf("\n");
}
return 0;
}
Output:
16 16 14 16 14 12 16 14 12 10 16 14 12 10 8 16 14 12 10 8 6 16 14 12 10 8 6 4 16 14 12 10 8 6 4 2
Method #2: Using For Loop (User Input)
Approach:
- Give the number of rows as user input and store it in a variable.
- Take a variable and initialize it with 2*double the number of rows say lastnumb.
- Take another variable and initialize it with the lastnumb say evennumb.
- Loop from 1 to the number of rows using For loop.
- Initialize the evennumb with the lastnumb.
- Loop from 0 to the iterator value of the parent For loop using another for loop(Nested For loop).
- Print the evennumb.
- Reduce the evennumb by 2.
- Print the Newline character after the end of the inner loop.
- The Exit of the Program.
1) Python Implementation
Give the number of rows as user input using int(input()) and store it in a variable.
Below is the implementation:
# Give the number of rows as user input using int(input()) and store it in a variable.
numberOfRows = int(input('Enter some random number of rows = '))
# Take a variable and initialize it with 2*double the number of rows say lastnumb.
lastnumb = 2*numberOfRows
# Take another variable and initialize it with the lastnumb say evennumb.
evennumb = lastnumb
# Loop from 1 to the number of rows using For loop.
for m in range(1, numberOfRows+1):
# Initialize the evennumb with the lastnumb.
evennumb = lastnumb
# Loop from 0 to the iterator value of the parent For loop using
# another for loop(Nested For loop).
for n in range(0, m):
# Print the evennumb.
print(evennumb, end=' ')
# Reduce the evennumb by 2.
evennumb = evennumb-2
# Print the Newline character after the end of the inner loop.
print()
Output:
Enter some random number of rows = 10 20 20 18 20 18 16 20 18 16 14 20 18 16 14 12 20 18 16 14 12 10 20 18 16 14 12 10 8 20 18 16 14 12 10 8 6 20 18 16 14 12 10 8 6 4 20 18 16 14 12 10 8 6 4 2
2) C++ Implementation
Give the number of rows as user input using cin and store it in a variable.
Below is the implementation:
#include <iostream>
using namespace std;
int main()
{
// Give the number of rows as user input using
// int(input()) and store it in a variable.
int numberOfRows;
cin >> numberOfRows;
// Take a variable and initialize it with 2*double the
// number of rows say lastnumb.
int lastnumb = 2 * numberOfRows;
// Take another variable and initialize it with the
// lastnumb say evennumb.
int evennumb = lastnumb;
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m <= numberOfRows; m++) {
// Initialize the evennumb with the lastnumb.
evennumb = lastnumb;
// Loop from 0 to the iterator value of the parent
// For loop using
// another for loop(Nested For loop).
for (int n = 0; n < m; n++) {
// Print the evennumb.
cout << evennumb << " ";
// Reduce the evennumb by 2.
evennumb = evennumb - 2;
}
// Print the Newline character after the end of the
// inner loop.
cout << endl;
}
return 0;
}
Output:
6 12 12 10 12 10 8 12 10 8 6 12 10 8 6 4 12 10 8 6 4 2
3) C Implementation
Give the number of rows as user input using scanf and store it in a variable.
Below is the implementation:
#include <stdio.h>
int main()
{
// Give the number of rows as user input using scanf and
// store it in a variable.
int numberOfRows;
scanf("%d", &numberOfRows);
// Take a variable and initialize it with 2*double the
// number of rows say lastnumb.
int lastnumb = 2 * numberOfRows;
// Take another variable and initialize it with the
// lastnumb say evennumb.
int evennumb = lastnumb;
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m <= numberOfRows; m++) {
// Initialize the evennumb with the lastnumb.
evennumb = lastnumb;
// Loop from 0 to the iterator value of the parent
// For loop using
// another for loop(Nested For loop).
for (int n = 0; n < m; n++) {
// Print the evennumb.
printf("%d ", evennumb);
// Reduce the evennumb by 2.
evennumb = evennumb - 2;
}
// Print the Newline character after the end of the
// inner loop.
printf("\n");
}
return 0;
}
Output:
6 12 12 10 12 10 8 12 10 8 6 12 10 8 6 4 12 10 8 6 4 2
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