## C program to convert an octal number into a binary number

Here, we are going to learn how to convert an octal number into a binary number in C programming language?
Submitted by Nidhi, on July 03, 2021

Problem Solution:

Here, we will read an octal number and convert it into a binary number and print the result on the console screen.

Program:

The source code to convert an octal number into a binary number is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

```// C program to convert an octal number
// into binary number

#include <stdio.h>

int main()
{
char octalNum[32];
int i = 0;

printf("Enter octal number: ");
scanf("%s", octalNum);

printf("Binay number: ");
while (octalNum[i]) {
switch (octalNum[i]) {
case '0':
printf("000");
break;

case '1':
printf("001");
break;

case '2':
printf("010");
break;

case '3':
printf("011");
break;

case '4':
printf("100");
break;

case '5':
printf("101");
break;

case '6':
printf("110");
break;

case '7':
printf("111");
break;

default:
printf("\nInvalid octal number");
return 0;
}
i++;
}

return 0;
}
```

Output:

```Enter octal number: 123
Binay number: 001010011
```

Explanation:

Here, we created a character array octalNum and integer variable i. Then we read the octal number and convert the number into a binary number and printed the result on the console screen.

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