Question

How to select random two consecutive digits from a number in C++

Answer 1

#include <iostream>
#include <string>
#include <cstdlib>
#include <ctime>
 
std::string getRandomTwoDigits(int num) {
    std::string s = std::to_string(num);
 
    if (s.size() < 2) {
        return "Error: number must have at least 2 digits";
    }
 
    int start = rand() % (s.size() - 1);
 
    return s.substr(start, 2);
}
 
int main() {
    srand(static_cast<unsigned>(time(nullptr))); 
 
    int num = 1234567;  
    std::string randomTwo = getRandomTwoDigits(num);
 
    std::cout << "Random two digits: " << randomTwo << std::endl;
}
 
 
  
/*
run:
  
Random two digits: 34
  
*/

 

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