Example: Multiplication Table using string Function in C++

// Multiplication Table using string Function
#include <iostream>
#include <string> // Required for std::string
#include <sstream> // Required for std::ostringstream
using namespace std;

// Function declaration
string getMultiplicationTableAsString(int num);

int main() {
    int userNumber;

    // Step 1: Prompt user for input
    cout << "Enter a number to get its multiplication table as a string: ";
    cin >> userNumber;

    // Step 2: Call the function and store the returned string
    string tableString = getMultiplicationTableAsString(userNumber);

    // Step 3: Print the generated string
    cout << "\nGenerated Table:\n" << tableString;

    return 0;
}

// Function definition
string getMultiplicationTableAsString(int num) {
    // Step 1: Use ostringstream to efficiently build the string
    ostringstream oss;
    oss << "Multiplication Table for " << num << ":\n";

    // Step 2: Loop to generate each table entry and append to ostringstream
    for (int i = 1; i <= 10; ++i) {
        oss << num << " x " << i << " = " << (num * i) << "\n";
    }

    // Step 3: Return the built string
    return oss.str();
}