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# C program to Convert Decimal to Octal Number

This C program converts a decimal number to its equivalent octal representation.

## Problem statement

You need to convert a decimal number to its octal representation.

## C program to Convert Decimal to Octal

```#include <stdio.h>

int decimalToOctal(int decimalNumber) {
int octalNumber = 0, i = 1;

while (decimalNumber != 0) {
octalNumber += (decimalNumber % 8) * i;
decimalNumber /= 8;
i *= 10;
}

return octalNumber;
}

int main() {
int decimalNumber;

printf("Decimal to Octal Converter\n");
printf("Enter a decimal number: ");
scanf("%d", &decimalNumber);

int octalNumber = decimalToOctal(decimalNumber);

printf("Octal number: %d\n", octalNumber);

return 0;
}
```

## How it works?

1. The program defines a function `decimalToOctal()` that takes a decimal number as input and returns the equivalent octal number.
2. Inside the `decimalToOctal()` function, we initialize the `octalNumber` variable to 0 and `i` variable to 1. These variables will be used to calculate the octal number.
3. We use a while loop that continues until the decimal number becomes 0.
4. Inside the loop, we update the `octalNumber` by adding the remainder of `decimalNumber` divided by 8 multiplied by `i`. This is done to convert the remainder to the corresponding octal digit at the appropriate place value.
5. We then divide `decimalNumber` by 8 to move on to the next digit.
6. We multiply `i` by 10 to update the place value for the next digit.
7. Finally, we return the `octalNumber`.
8. In the `main()` function, we prompt the user to enter a decimal number and store it in the `decimalNumber` variable using `scanf()`.
9. We call the `decimalToOctal()` function with `decimalNumber` as an argument and store the returned octal number in the `octalNumber` variable.
10. Finally, we display the converted octal number using `printf()`.

## Input/Output

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