I started C++ in Uni. Now we are using loops. I have practical assignment: Task: Input: integer number. Remove all digits that can be found on the left from most right digit 1.
For example:
Or:
For this task we can not use arrays or strings. However we still can use math functions. Also there must obligatory be while/do while condition.
I have already written the code that finds values before the first digit 1 using % and /. However, as a result it doesn't work properly and when I enter something like 431004 - it will just show 4, not the 004. Here is my code:
#include <iostream>
using namespace std;
int main()
{
int number;
cout << endl << "Enter integer number: ";
cin >> number;
int result;
int buffer = 0;
int divider = 10;
int check = 1;
do {
result = buffer;
buffer = number % divider;
divider = divider * 10;
check *= 10;
} while ((buffer / (check / 10)) != 1);
cout << endl << "Result = " << result;
return 0;
}
004 and 4 are ths ame number 4.
If you need for example to output 4 as 004 then use manupulators std::setfill and std::setw declared in header <iomanip>.
Also you should declare the variable number as having an unsigned integer type instead of the type int. Otherwise you need to take into account the sign of a number.
Here is a demonstration program that shows how to get the expected result using the manipulators.
#include <iostream>
#include <iomanip>
int main()
{
const unsigned int Base = 10;
unsigned long long int number;
std::cout << "Enter a non-negative integer number: ";
if (std::cin >> number)
{
unsigned long long int result = 0;
unsigned long long int multiplier = 1;
int n = 0;
while ( number && number % Base != 1 )
{
result += ( number % Base ) * multiplier;
++n;
multiplier *= Base;
number /= Base;
}
std::cout << "Result = "
<< std::setw( n ) << std::setfill( '0' ) << result << std::endl;
}
}
The program output might look like
Enter a non-negative integer number: 431004
Result = 004