Menu
I have some numbers of different length (like 1, 999, 76492, so on) and I want to convert them all to strings with a common length (for example, if the length is 6, then those strings will be: '000001', '000999', '076492').
In other words, I need to add correct amount of leading zeros to the number.
int n = 999; string str = some_function(n,6); //str = '000999' Is there a function like this in C++?
912
Using the str() Function The str() function can be used to change any numeric type to a string. The nice thing about str() is that it can handle converting any type of number to a string, so you don't need to worry about choosing the correct method based on what type of number you're converting.
The logic is very simple. Here we will use the sprintf() function. This function is used to print some value or line into a string, but not in the console. This is the only difference between printf() and sprintf().
or using the stringstreams:
#include <sstream> #include <iomanip> std::stringstream ss; ss << std::setw(10) << std::setfill('0') << i; std::string s = ss.str(); I compiled the information I found on arachnoid.com because I like the type-safe way of iostreams more. Besides, you can equally use this code on any other output stream.
117
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
