This article guide you for writing a C++ Program which converts Decimal Number to Binary Number. We can convert any decimal number (base-10 (0 to 9)) into binary number (base-2 (0 or 1)) by C++ program.

## Decimal Number

Decimal number is a base 10 number because it ranges from 0 to 9, there are total 10 digits between 0 to 9. Any combination of digits is decimal number such as 223, 585, 192, 0, 7 etc.

## Binary Number

Binary number is a base 2 number because it is either 0 or 1. Any combination of 0 and 1 is binary number such as 1001, 101, 11111, 101010 etc.

C++ Program to Print Alphabet Triangle.

Let’s see the some binary numbers for the decimal number.

Decimal | Binary |

1 | 0 |

2 | 10 |

3 | 11 |

4 | 100 |

5 | 101 |

6 | 110 |

7 | 111 |

8 | 1000 |

9 | 1001 |

10 | 1010 |

11 | 1011 |

12 | 1100 |

13 | 1101 |

14 | 1110 |

15 | 1111 |

## Decimal to Binary Conversion Algorithm

- Divide the number by 2 through % (modulus operator) and store the remainder in array
- Divide the number by 2 through / (division operator)
- Repeat the step 2 until the number is greater than zero

Let’s see the C++ example to convert decimal to binary.

#include <iostream> using namespace std; int main() { int a[10], n, i; cout<<"Enter the number to convert: "; cin>>n; for(i=0; n>0; i++) { a[i]=n%2; n= n/2; } cout<<"Binary of the given number= "; for(i=i-1 ;i>=0 ;i--) { cout<<a[i]; } }

**Output:**

Enter the number to convert: 9 Binary of the given number= 1001

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## Conclusion:

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