在C ++中将字符串拆分为4个字符

Question

i have a question regarding splitting a string. I am working on creating a binary to Hex converter, and want to split up my binary sequence that is represented as a string by 4 chars so that I can easily convert each set of 4 bits into a hexadecimal form:

Example:

00000111010110111100110100010101

would turn into:

"0000", "0111", "0101", "1011", "1100", "1101", "0001", "0101"

Thank you for any assistance you can provide!

Answer 1

Using the std::string::substr function and a simple for loop you can just sub-divide the string into groups of 4 and push them into a std::vector<std::string> as shown below...

#include <iostream>
#include <vector>
#include <string>

int main() {
    std::string nums = "00000111010110111100110100010101";
    std::vector<std::string> bins;

    for (std::size_t i = 0; i < nums.size(); i += 4)
        bins.push_back(nums.substr(i, 4));

    return 0;
}

Then bins becomes a std::vector filled with the sub-divided binary numbers.