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.

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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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If you wish to look at other example programs on Simple C Programs, go to Simple C Programs. If you wish to look at programming examples on all topics, go to C Programming Examples.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn