Octal to Binary in C

This is a C program to Convert Octal to Binary.

Problem Description

This program takes a octal number as input and converts it into binary.

Problem Solution

1. Take a octal number as input.
2. Print the binary value of each digit of a octal number. Use switch statement and while loop to do this.

Program/Source Code

Here is source code of the C program to Convert Octal to Binary. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Convert Octal to Binary

```
 */
```
```
#include <stdio.h>
```
```
#define MAX 1000
```
```
 
```
```
int main()
```
```
{
```
```
    char octalnum[MAX];
```
```
    long i = 0;
```
```
 
```
```
    printf("Enter any octal number: ");
```
```
    scanf("%s", octalnum);
```

    printf("Equivalent binary value: ");

```
    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("\n Invalid octal digit %c ", octalnum[i]);

```
            return 0;
```
```
        }
```
```
        i++;
```
```
    }
```
```
    return 0;
```
```
}
```

Program Explanation

1. Take a octal number as input and store it in the array octalnum.
2. Using switch statement access each digit of a octal number and print its equivalent binary value in a 3 bit fashion. For example: for 0, print its binary value as 000.
3. Do step 2 under a while loop.
4. Exit.

Runtime Test Cases

Output:
 
Enter any octal number: a
Equivalent binary value:
Invalid octal digit a
 
 
Enter any octal number: 160
Equivalent binary value: 001110000

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