C code to
convert octal number to decimal number
#include<stdio.h>
#include<math.h>
int main(){
long int octal,decimal
=0;
int i=0;
printf("Enter
any octal number: ");
scanf("%ld",&octal);
while(octal!=0){
decimal
= decimal + (octal % 10) * pow(8,i++);
octal
= octal/10;
}
printf("Equivalent
decimal value: %ld",decimal);
return 0;
}
Sample
output:
Enter any octal number: 346
Equivalent decimal value: 230
C program to
change octal to decimal
#include<stdio.h>
int main(){
long int octalNumber;
printf("Enter
any octal number: ");
scanf("%o",&octalNumber);
printf("Equivalent
decimal number is: %d",octalNumber);
return 0;
}
Sample output:
Enter any octal number: 17
Equivalent decimal number is: 15
Algorithm:
Octal to
decimal conversion method:
To convert an octal number to decimal number multiply
each digits separately of octal number from right side by 8^0,8^1,8^2,8^3 … respectively and then find out
the sum of them.
Octal to
decimal conversion examples:
For example we
want to convert octal number 3401 to decimal number.
Step 1: 1 * 8 ^0 = 1*1 =1
Step 2: 0 * 8 ^1 = 0*8 =0
Step 3: 4 * 8 ^2 = 4*64 =256
Step 4: 3 * 8 ^3 = 3*512 =1536
Sum= 1 + 0 + 256 + 1536 = 1793
So, (3401)8 = (1793)10
