C++ Exercises: Convert a binary number to octal number
C++ For Loop: Exercise-75 with Solution
Write a C++ program to convert a binary number to an octal number.
Pictorial Presentation:

Sample Solution:-
C++ Code :
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int binnum1, binaryNumber,rem, decnum=0, quot, i=1, j;
int octnum[100];
cout << "\n\n Convert a binary number to octal number:\n";
cout << "---------------------------------------------\n";
cout << " Input a binary number: ";
cin>> binaryNumber;
binnum1=binaryNumber;
while(binaryNumber > 0)
{
rem = binaryNumber % 10;
decnum = decnum + rem*i;
i = i*2;
binaryNumber = binaryNumber/10;
}
i=1;
quot = decnum;
while(quot > 0)
{
octnum[i++] = quot % 8;
quot = quot / 8;
}
cout<<" The equivalent octal value of " <<binnum1<< " is : ";
for(j=i-1; j>0; j--)
{
cout<<octnum[j];
}
cout<<"\n";
}
Sample Output:
Convert a binary number to octal number: --------------------------------------------- Input a binary number: 1011 The equivalent octal value of 1011 is : 13
Flowchart:

C++ Code Editor:
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Previous: Write a program in C++ to convert a binary number to hexadecimal number.
Next: Write a program in C++ to convert a octal number to decimal number.
What is the difficulty level of this exercise?
C++ Programming: Tips of the Day
Using C++ library in C code
You will need to write an interface layer in C++ that declares functions with extern "C":
extern "C" int foo(char *bar) { returnrealFoo(std::string(bar)); }
Then, you will call foo() from your C module, which will pass the call on to the realFoo() function which is implemented in C++.
If you need to expose a full C++ class with data members and methods, then you may need to do more work than this simple function example.
Ref: https://bit.ly/3clHy43
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