Question

How to move the digits of a string with digits and letters to the beginning of the string in C++

Answer 1

#include <iostream>
#include <string>
#include <algorithm>
 
std::string moveDigitsToStart(const std::string& input) {
    std::string digits, letters;
 
    // Separate digits and letters
    for (char ch : input) {
        if (std::isdigit(ch)) {
            digits += ch;
        } else if (std::isalpha(ch)) {
            letters += ch;
        }
    }
 
    // Combine digits and letters
    return digits + letters;
}
 
int main() {
    std::string str = "d2c54be3a1";
     
    str = moveDigitsToStart(str);
 
    std::cout << str << std::endl;
}
 
  
  
/*
run:
  
25431dcbea
  
*//

 

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