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Given the number of rows, the task is to print Double the Number Pattern in C, C++, and Python.
Examples:
Example1:
Input:
Given number of rows = 10
Output:
1 2 1 4 2 1 8 4 2 1 16 8 4 2 1 32 16 8 4 2 1 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1
Example2:
Input:
Given number of rows = 7
Output:
1 2 1 4 2 1 8 4 2 1 16 8 4 2 1 32 16 8 4 2 1
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Program to Print Double the Number Pattern in C, C++, and Python
Below are the ways to print Double the 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.
- Loop from 1 to the number of rows using For loop.
- Loop from iterator value of the parent For loop -1 to 0 in decreasing order using another for loop(Nested For loop).
- Print the 2 power n value with space where n is the value of the inner for loop.
- 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.
numbrrows = 7
# Loop from 1 to the number of rows using For loop.
for m in range(1, numbrrows):
# Loop from iterator value of the parent For loop -1 to 0
# in decreasing order using another for loop(Nested For loop).
for n in range(m - 1, -1, -1):
# Print the 2 power n value with space where n is the value of the inner for loop.
print(2**n, end=' ')
# Print the Newline character after the end of the inner loop.
print()
Output:
1 2 1 4 2 1 8 4 2 1 16 8 4 2 1 32 16 8 4 2 1
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 numbrrows = 10;
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m < numbrrows; m++) {
/* Loop from iterator value of the parent For loop
-1 to 0 in decreasing order using another for
loop(Nested For loop)*/
for (int n = m - 1; n >= 0; n--) {
// Print the 2 power n value with space where n
// is the value of the inner for loop.
cout << pow(2, n) << " ";
}
// Print the Newline character after the end of the
// inner loop.
cout << endl;
}
return 0;
}
Output:
1 2 1 4 2 1 8 4 2 1 16 8 4 2 1 32 16 8 4 2 1 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1
3) C Implementation
Below is the implementation:
#include <math.h>
#include <stdio.h>
int main()
{
// Give the number of rows as static input and store it
// in a variable.
int numbrrows = 4;
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m < numbrrows; m++) {
/* Loop from iterator value of the parent For loop
-1 to 0 in decreasing order using another for
loop(Nested For loop)*/
for (int n = m - 1; n >= 0; n--) {
// Print the 2 power n value with space where n
// is the value of the inner for loop.
int powervalu = pow(2, n);
printf("%d ", powervalu);
}
// Print the Newline character after the end of the
// inner loop.
printf("\n");
}
return 0;
}
Output:
1 2 1 4 2 1
Method #2: Using For Loop (User Input)
Approach:
- Give the number of rows as user input and store it in a variable.
- Loop from 1 to the number of rows using For loop.
- Loop from iterator value of the parent For loop -1 to 0 in decreasing order using another for loop(Nested For loop).
- Print the 2 power n value with space where n is the value of the inner for loop.
- 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.
numbrrows = int(input('Enter some random number of rows = '))
# Loop from 1 to the number of rows using For loop.
for m in range(1, numbrrows):
# Loop from iterator value of the parent For loop -1 to 0
# in decreasing order using another for loop(Nested For loop).
for n in range(m - 1, -1, -1):
# Print the 2 power n value with space where n is the value of the inner for loop.
print(2**n, end=' ')
# Print the Newline character after the end of the inner loop.
print()
Output:
Enter some random number of rows = 8 1 2 1 4 2 1 8 4 2 1 16 8 4 2 1 32 16 8 4 2 1 64 32 16 8 4 2 1
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>
#include <math.h>
using namespace std;
int main()
{
// Give the number of rows as user input using
// int(input()) and store it in a variable.
int numbrrows;
cin >> numbrrows;
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m < numbrrows; m++) {
/* Loop from iterator value of the parent For loop
-1 to 0 in decreasing order using another for
loop(Nested For loop)*/
for (int n = m - 1; n >= 0; n--) {
// Print the 2 power n value with space where n
// is the value of the inner for loop.
cout << pow(2, n) << " ";
}
// Print the Newline character after the end of the
// inner loop.
cout << endl;
}
return 0;
}
Output:
5 1 2 1 4 2 1 8 4 2 1
3) C Implementation
Give the number of rows as user input using scanf and store it in a variable.
Below is the implementation:
#include <math.h>
#include <stdio.h>
int main()
{
// Give the number of rows as user input using scanf and
// store it in a variable.
int numbrrows;
scanf("%d", &numbrrows);
// Loop from 1 to the number of rows using For loop.
for (int m = 1; m < numbrrows; m++) {
/* Loop from iterator value of the parent For loop
-1 to 0 in decreasing order using another for
loop(Nested For loop)*/
for (int n = m - 1; n >= 0; n--) {
// Print the 2 power n value with space where n
// is the value of the inner for loop.
int powervalu = pow(2, n);
printf("%d ", powervalu);
}
// Print the Newline character after the end of the
// inner loop.
printf("\n");
}
return 0;
}
Output:
5 1 2 1 4 2 1 8 4 2 1
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