# Print half pyramids using * as shown

by
Kavit
·
Published
· Updated

#### Pattern 1 :

```
*
**
***
****
*****
```

#### Logic :

i |
height |
Number of * (= i) |

1 |
5 |
1 |

2 |
5 |
2 |

3 |
5 |
3 |

4 |
5 |
4 |

5 |
5 |
5 |

#### Solution :

#### Pattern 2 :

```
*
**
***
****
*****
```

#### Logic :

i |
height |
Number of spaces (= height – i) |
Number of * (= i) |

1 |
5 |
4 |
1 |

2 |
5 |
3 |
2 |

3 |
5 |
2 |
3 |

4 |
5 |
1 |
4 |

5 |
5 |
0 |
5 |

#### Solution :

#### Pattern 3 :

```
*****
****
***
**
*
```

#### Logic :

i |
height |
Number of * (= height – i + 1) |

1 |
5 |
5 |

2 |
5 |
4 |

3 |
5 |
3 |

4 |
5 |
2 |

5 |
5 |
1 |

#### Solution :

#### Pattern 4 :

```
*****
****
***
**
*
```

#### Logic :

i |
height |
Number of spaces (= i – 1) |
Number of * (= height – i + 1) |

1 |
5 |
0 |
5 |

2 |
5 |
1 |
4 |

3 |
5 |
2 |
3 |

4 |
5 |
3 |
2 |

5 |
5 |
4 |
1 |

#### Solution :

Tags: javascriptpatternspyramid

####
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what about pascal’s triangle?

Good point. The post solving the pascal triangle can be found here http://js-algorithms.tutorialhorizon.com/2015/11/24/pascals-triangle/