Question

How to select random three consecutive digits from a 6-digit number in C++

Answer 1

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>

// Function to get random three consecutive digits from a 6-digit number
std::string getRandomThreeDigits(int num) {
    std::string s = std::to_string(num);

    // Ensure it's exactly 6 digits
    if (s.size() != 6) {
        return "Error: number must be 6 digits";
    }

    int start = rand() % 4;  // Random start index (0–3)
    
    return s.substr(start, 3);
}

int main() {
    srand(time(0));  // Seed random generator

    int num = 123456;  // Example 6-digit number
    std::string randomThreeDigits = getRandomThreeDigits(num);

    std::cout << "Random three consecutive digits: " << randomThreeDigits << std::endl;
}


 
/*
run:
 
Random three consecutive digits: 234
 
*/

 

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