# C Program to Convert Octal to Binary

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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.

1. `/*`
2. ` * C Program to Convert Octal to Binary`
3. ` */`
4. `#include <stdio.h>`
5. `#define MAX 1000`
6. ` `
7. `int main()`
8. `{`
9. `    char octalnum[MAX];`
10. `    long i = 0;`
11. ` `
12. `    printf("Enter any octal number: ");`
13. `    scanf("%s", octalnum);`
14. `    printf("Equivalent binary value: ");`
15. `    while (octalnum[i])`
16. `    {`
17. `        switch (octalnum[i])`
18. `        {`
19. `        case '0':`
20. `            printf("000"); break;`
21. `        case '1':`
22. `            printf("001"); break;`
23. `        case '2':`
24. `            printf("010"); break;`
25. `        case '3':`
26. `            printf("011"); break;`
27. `        case '4':`
28. `            printf("100"); break;`
29. `        case '5':`
30. `            printf("101"); break;`
31. `        case '6':`
32. `            printf("110"); break;`
33. `        case '7':`
34. `            printf("111"); break;`
35. `        default:`
36. `            printf("\n Invalid octal digit %c ", octalnum[i]);`
37. `            return 0;`
38. `        }`
39. `        i++;`
40. `    }`
41. `    return 0;`
42. `}`
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.

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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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