How to get numbers into array after point "." [closed] - c++

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How i can put the numbers into array like 11*11 = 121 how i can put 121 as 1,2,1 into array , so that it should like int arr[] = [1,2,1]; , the one logic to me is divide it by 10 , the code i am trying is
long mul , cube;
mul = num*num;
cube = num*num*num;
float unt = mul/10.0;
But how to save the number after period . into array , like if i have the number 2.3 so i want to save 3 into array

Answer 1

I think you want to get the individual digits into an array.
You can get the digits into an array in reverse order by following the algorithm (let n be the number you want to split):
while (n > 0):
push (n mod 10) into the array --- this is one digit from 0..9
divide n by 10, ignoring the decimal part (ignoring remainder, that is)
For example, with n=97 you get:
(n mod 10) = 7, push that into array
divide 97 by 10 to get 9 (ignoring .7)
(n mod 10) = 9, push that into array
divide 9 by 10 to get 0
end algorithm
now you have [7, 9] in the array, then reverse the array to get the left-to-right ordering.

Answer 2

Follow on from the OP requesting a code sample, and my understanding of the question. This implements the algorithm from another answer (Antti Huima);
#include <iostream>
#include <vector>
#include <algorithm>
std::vector<int> convert(int number)
{
std::vector<int> result;
if (number == 0) {
result.push_back(0);
}
while (number) {
int temp = number % 10;
number /= 10;
result.push_back(temp);
//result.insert(result.begin(), temp); // alternative... inserts in "forward" order
}
// push_back inserts the elements in reverse order, so we reverse them again
std::reverse(result.begin(), result.end());
return result;
}
int main()
{
int i = 123;
auto result = convert(i);
std::cout << i << std::endl;
for (auto& j : result) {
std::cout << j << ',';
}
std::cout << std::endl;
}
It's been implemented assuming certain basics (that can be altered or templated);
int base type and int as the array member
Variable array size is catered for (in the vector)
convert is a very arbitrary name
The main is just a demonstration of its use (so I was a little more liberal in C++11 language use).
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