Octal to decimal conversion in C++ by R4R Team

Decimal number:
Consists of 10 elements
range : 0 to 9

Octal number :
Consists of 8 elements
range : 0 to 7

Octal to Decimal conversion:
Example-Octal number is 7
Decimal number is 7
Octal number is 15
Decimal number is 41

program:

#include< iostream>
#include< math.h>
int main() {
int n,num=0,i=0,sum=0;
cout<<"Enter Octal number"<< endl;
cin>>n;
while(n)
{
num=n%10;
num=num*pow(8,i++);
sum=sum+num;
n=n/10;
}
cout<<"It's Decimal is "<< sum;
}

Enter Octal number
41
It's Decimal is 33