Program 323:Octal to Binary Conversion in C

Octal to Binary Conversion in C
Method I:Can Accept more number of digits for conversion

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
main()
{
 char *octalNum[]={"000","001","010","011","100","101","110","111"};
 int i=0,number,j=1;
 long long int octal,temp;
 char binary[20][6];
 printf("Enter Octal number\n");
 scanf("%lld",&octal);
 temp=octal;
 while(temp!=0)
 {
  number=temp%10;
  if(number>=0 && number<=7)
  {
  strcpy(binary[i],octalNum[number]);
   temp/=10;
   i++;
  }
  else
  {
   printf("Invalid Octal Number\n");
   exit(0);
  }
 }
 printf("Binary number for given Octal number %lld is\n",octal);
 for(j=i-1;j>=0;j--)
 printf("%s",binary[j]);
 printf("\n");
 
}

Method II:Limited number of digits Maximum only 4

#include<stdio.h>
#include<math.h>
int ConvertFromDecimalToOther(int,int);
int ConvertFromOctaltoDecimal(int);
int main()
{
    int binary,decimal,octal;
    printf("Enter Octal Number\n");
    scanf("%d",&octal);
    decimal=ConvertFromOctaltoDecimal(octal);
 binary=ConvertFromDecimalToOther(decimal,2);
 printf("Binary Number for given Octal Number %d is %d\n",octal,binary); 
 return(0); 
}
int ConvertFromDecimalToOther(int decimal,int num)
{
    int temp,final=0,i,j=1; 
    temp=decimal;
    while(temp!=0)
    {
      i=temp%num;
      final=final+(i*j);
      temp=temp/num;
      j=j*10;
     }
     return(final);
}

int ConvertFromOctaltoDecimal(int octal)
{
 int dec=0,temp,i,inc=0;
    temp=octal;
    while(temp!=0)
    {
      i=temp%10;
      dec=dec+(i*pow(8,inc));
      temp=temp/10;
      inc++;
    }
    return(dec);
}

Explanation:

//Coming Soon...

Output:

Method I

Method I

Method II