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Given the number of rows, the task is to Print Equilateral triangle Pattern of Star in C, C++, and Python
Examples:
Example1:
Input:
Given number of rows = 8
Output:
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
Example2:
Input:
Given number of rows = 10 Given Character to print ='$'
Output
$
$ $
$ $ $
$ $ $ $
$ $ $ $ $
$ $ $ $ $ $
$ $ $ $ $ $ $
$ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $ $
Program to Print the Equilateral triangle Pattern of Star in C, C++, and Python
Below are the ways to Print the Equilateral triangle Pattern of Star in C, C++, and Python.
Method #1: Using For Loop (Star Character)
Approach:
- Give the number of rows as static input and store it in a variable.
- Take a variable to say g and initialize its value with (2*number of rows)-2.
- Loop from 0 to the number of rows using For loop.
- Loop from 0 to g using another For Loop(Inner For loop).
- Print the space character in the inner For Loop.
- Decrement the value of g by 1 after the end of the inner For loop.
- Loop from 0 to m+1 using another For loop(Nested For loop) where m is the iterator value of the parent For loop.
- Print the star character with space.
- Print the Newline character after the end of the Two inner For loops.
- 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 = 8
# Take a variable to say g and initialize its value with (2*number of rows)-2.
g = (2*numberOfRows)-2
# Loop from 0 to the number of rows using For loop.
for m in range(0, numberOfRows):
# Loop from 0 to g using another For Loop(Inner For loop).
for n in range(0, g):
# Print the space character in the inner For Loop.
print(end=" ")
# Decrement the value of g by 1 after the end of the inner For loop.
g = g-1
# Loop from 0 to m+1 using another For loop(Nested For loop)
# where m is the iterator value of the parent For loop.
for n in range(0, m+1):
# Print the star character with space.
print('*', end=" ")
# Print the Newline character after the end of the Two inner For loops.
print()
Output:
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
2) C++ Implementation
Below is the implementation:
#include <iostream>
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 to say g and initialize its value
// with (2*number of rows)-2.
int g = (2 * numberOfRows) - 2;
// Loop from 0 to the number of rows using For loop.
for (int m = 0; m < numberOfRows; m++) {
// Loop from 0 to g using another For Loop(Inner For
// loop).
for (int n = 0; n < g; n++) {
// Print the space character in the inner For
// Loop.
cout << " ";
}
// Decrement the value of g by 1 after the end of
// the inner For loop.
g = g - 1;
// Loop from 0 to m+1 using another For loop(Nested
// For loop) where m is the iterator value of the
// parent For loop.
for (int n = 0; n < m + 1; n++) {
// Print the star character with space.
cout << "* ";
}
// Print the Newline character after the end of the
// Two inner For loops.
cout << endl;
}
return 0;
}
Output:
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
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 = 13;
// Take a variable to say g and initialize its value
// with (2*number of rows)-2.
int g = (2 * numberOfRows) - 2;
// Loop from 0 to the number of rows using For loop.
for (int m = 0; m < numberOfRows; m++) {
// Loop from 0 to g using another For Loop(Inner For
// loop).
for (int n = 0; n < g; n++) {
// Print the space character in the inner For
// Loop.
printf(" ");
}
// Decrement the value of g by 1 after the end of
// the inner For loop.
g = g - 1;
// Loop from 0 to m+1 using another For loop(Nested
// For loop) where m is the iterator value of the
// parent For loop.
for (int n = 0; n < m + 1; n++) {
// Print the star character with space.
printf("* ");
}
// Print the Newline character after the end of the
// Two inner For loops.
printf("\n");
}
return 0;
}
Output:
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
* * * * * * * * * *
* * * * * * * * * * *
* * * * * * * * * * * *
* * * * * * * * * * * * *
Method #2: Using For Loop (User Input)
Approach:
- Give the number of rows as static input and store it in a variable.
- Scan the character to print as user input and store it in a variable.
- Take a variable to say g and initialize its value with (2*number of rows)-2.
- Loop from 0 to the number of rows using For loop.
- Loop from 0 to g using another For Loop(Inner For loop).
- Print the space character in the inner For Loop.
- Decrement the value of g by 1 after the end of the inner For loop.
- Loop from 0 to m+1 using another For loop(Nested For loop) where m is the iterator value of the parent For loop.
- Print the star character with space.
- Print the Newline character after the end of the Two inner For loops.
- 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.
- Give the Character as user input using input() and store it in another 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 = '))
# Give the character to print as user input using int(input()) and store it in another variable.
characte = input('Enter some random character to print = ')
# Take a variable to say g and initialize its value with (2*number of rows)-2.
g = (2*numberOfRows)-2
# Loop from 0 to the number of rows using For loop.
for m in range(0, numberOfRows):
# Loop from 0 to g using another For Loop(Inner For loop).
for n in range(0, g):
# Print the space character in the inner For Loop.
print(end=" ")
# Decrement the value of g by 1 after the end of the inner For loop.
g = g-1
# Loop from 0 to m+1 using another For loop(Nested For loop)
# where m is the iterator value of the parent For loop.
for n in range(0, m+1):
# Print the given character with space.
print(characte, end=" ")
# Print the Newline character after the end of the Two inner For loops.
print()
Output
Enter some random number of rows = 10
Enter some random character to print = $
$
$ $
$ $ $
$ $ $ $
$ $ $ $ $
$ $ $ $ $ $
$ $ $ $ $ $ $
$ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $ $
2) C++ Implementation
- Give the number of rows as user input using cin and store it in a variable.
- Give the Character as user input using cin and store it in another variable.
Below is the implementation:
#include <iostream>
using namespace std;
int main()
{
// Give the number of rows as user input using
// cin and store it in a variable.
int numberOfRows;
cin >> numberOfRows;
// Create a character variable.
char characte;
// Give the character as user input using cin and store
// it in another variable.
cout << "Enter some random character to print = "
<< endl;
cin >> characte;
cout << endl;
int g = (2 * numberOfRows) - 2;
// Loop from 0 to the number of rows using For loop.
for (int m = 0; m < numberOfRows; m++) {
// Loop from 0 to g using another For Loop(Inner For
// loop).
for (int n = 0; n < g; n++) {
// Print the space character in the inner For
// Loop.
cout << " ";
}
// Decrement the value of g by 1 after the end of
// the inner For loop.
g = g - 1;
// Loop from 0 to m+1 using another For loop(Nested
// For loop) where m is the iterator value of the
// parent For loop.
for (int n = 0; n < m + 1; n++) {
// Print the given character with space.
cout << characte << " ";
}
// Print the Newline character after the end of the
// Two inner For loops.
cout << endl;
}
return 0;
}
Output
10
Enter some random character to print = $
$
$ $
$ $ $
$ $ $ $
$ $ $ $ $
$ $ $ $ $ $
$ $ $ $ $ $ $
$ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $ $
3) C Implementation
- Give the number of rows as user input using scanf and store it in a variable.
- Give the Character as user input using scanf and store it in another 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);
// Create a character variable.
// Give the character as user input using scanf and
// store it in another variable.
char characte;
scanf("%c", &characte);
printf("\n");
// Take a variable to say g and initialize its value
// with (2*number of rows)-2.
int g = (2 * numberOfRows) - 2;
// Loop from 0 to the number of rows using For loop.
for (int m = 0; m < numberOfRows; m++) {
// Loop from 0 to g using another For Loop(Inner For
// loop).
for (int n = 0; n < g; n++) {
// Print the space character in the inner For
// Loop.
printf(" ");
}
// Decrement the value of g by 1 after the end of
// the inner For loop.
g = g - 1;
// Loop from 0 to m+1 using another For loop(Nested
// For loop) where m is the iterator value of the
// parent For loop.
for (int n = 0; n < m + 1; n++) {
// Print the given character with space.
printf("%c ",characte);
}
// Print the Newline character after the end of the
// Two inner For loops.
printf("\n");
}
return 0;
}
Output
10$
$
$ $
$ $ $
$ $ $ $
$ $ $ $ $
$ $ $ $ $ $
$ $ $ $ $ $ $
$ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $ $
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