If i have a int say 306. What is the best way to separate the numbers 3 0 6, so I can use them individually? I was thinking converting the int to a string then parsing it?
int num;
stringstream new_num;
new_num << num;
Im not sure how to do parse the string though. Suggestions?
Without using strings, you can work backwards. To get the 6,
306 % 10This will print each digit backwards:
while (num > 0) {
cout << (num % 10) << endl;
num /= 10;
}
Just traverse the stream one element at a time and extract it.
char ch;
while( new_num.get(ch) ) {
std::cout << ch;
}
Charles's way is much straight forward. However, it is not uncommon to convert the number to string and do some string processing if we don't want struggle with the math:)
Here is the procedural we want to do :
306 -> "306" -> ['3' ,'0', '6'] -> [3,0,6]
Some language are very easy to do this (Ruby):
>> 306.to_s.split("").map {|c| c.to_i}
=> [3,0,6]
Some need more work but still very clear (C++) :
#include <sstream>
#include <iostream>
#include <algorithm>
#include <vector>
int to_digital(int c)
{
return c - '0';
}
void test_string_stream()
{
int a = 306;
stringstream ss;
ss << a;
string s = ss.str();
vector<int> digitals(s.size());
transform(s.begin(),s.end(),digitals.begin(),to_digital);
}
to_digital() doesn't work for all encodings.Loop string and collect values like
int val = new_num[i]-'0';
