Hexadecimal to Octal - C++ Program

Q. Write a C++ program to convert hexadecimal number to octal number.

Following program is converting a hexadecimal number to octal number.

#include<iostream>
#include<string.h>
#include<math.h>
using namespace std;
int convhexatooct(char hexa[]);
int main()
{
char hexa[20];
cout<<"\n Enter Hexadecimal Number : ";
cin>>hexa;
cout<<"\n Conversion of Hexadecimal Number to Octal Number : "<<convhexatooct(hexa);
return 0;
}
int convhexatooct(char hexa[])
{
int i, len, deci=0, oct=0;
for(len=0; hexa[len]!='\0'; len++);
for(i=0; hexa[i]!='\0'; i++,len--)
{
(hexa[i]>='0' && hexa[i]<='9')
{
deci= deci + (hexa[i]-'0')*pow(16,len-1);
}
if(hexa[i]>='A' && hexa[i]<='F')
{
deci = deci + (hexa[i]-55)*pow(16,len-1);
}
if(hexa[i]>='a' && hexa[i]<='f')
{
deci = deci + (hexa[i]-87)*pow(16,len-1);
}
} // Now, variable deci contains the decimal value of given hexadecimal number.
i=1;
while(deci!=0)
{
oct = oct + (deci%8)*i;
deci = deci/8;
i = i*10;
}
return oct;
}

Output: