## INDEX

### Binary to octal conversion in c

C program c program to convert binary to octal

#include<stdio.h>
int main(){

long int binaryNumber,octalNumber=0,j=1,remainder;

printf("Enter any number any binary number: ");
scanf("%ld",&binaryNumber);

while(binaryNumber!=0){
remainder=binaryNumber%10;
octalNumber=octalNumber+remainder*j;
j=j*2;
binaryNumber=binaryNumber/10;
}

printf("Equivalent octal value: %lo",octalNumber);

return 0;
}

Sample output:

Enter any number any binary number: 1101

C code for how to convert large binary to octal

#include<stdio.h>
#define MAX 1000

int main(){

char binaryNumber[MAX],octalNumber[MAX];
long int i=0,j=0;

printf("Enter any number any binary number: ");
scanf("%s",binaryNumber);

while(binaryNumber[i]){
binaryNumber[i] = binaryNumber[i] -48;
++i;
}

--i;
while(i-2>=0){
octalNumber[j++] = binaryNumber[i-2] *4 +  binaryNumber[i-1] *2 + binaryNumber[i] ;
i=i-3;
}

if(i ==1)
octalNumber[j] = binaryNumber[i-1] *2 + binaryNumber[i] ;
else if(i==0)
octalNumber[j] =  binaryNumber[i] ;
else
--j;

printf("Equivalent octal value: ");
while(j>=0){
printf("%d",octalNumber[j--]);
}

return 0;
}

Sample output:

Enter any number any binary number: 1111111111111111111
1111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111
11111111
Equivalent octal value: 3777777777777777777777777777777
7777777777777777777777777777777777777777777777777777

Alogrithm:

Binary to octal conversion method:

Step1: Arrange the binary number in the group 3 from right side.

Step 2:  Replace the each group with following values:

 Binary number Octal values 000 0 001 1 010 2 011 3 100 4 101 5 110 6 111 7
Binary to octal chart

Binary to octal conversion examples:

For example we want to convert binary number 1011010101001101 to octal.

Step 1: 001 011 010 101 001 101
Step 2:  1   3   2   5   1   5

So (1011010101001101)2 = (132515)8

6. Write a c program to convert octal number to hexadecimal number.
8. Write a c program to convert hexadecimal number to octal number.
9. Write a c program to convert hexadecimal number to decimal number.
10. Write a c program to convert binary number to octal number.

nthabiseng lekalakala said...

i need help with a certain code. in the code the user has to supply a base to convert from and an integer number which is read as a sequence of characters. if the given number is valid, then the program will prompt the user for a new base and the program will convert the number to that new base representation.

Abhishek kumar said...

i didn't undestand this line plzzz explain
binary[i]=binary[i]-48
i++

rashmi sharma said...

pls explain
binary[i]=binary[i]-48
i++