C++ convert vector of digits into integer

Converting a Vector of Digits into an Integer in C++

To convert a vector of digits into an integer in C++, you can follow these steps:

  1. Include the necessary headers: In order to use vectors and the required functions, include the <vector> and <cmath> headers.

  2. Declare the vectors: Declare a vector to store the digits and an integer variable to store the final result.

  3. Populate the vector: Add the digits to the vector. Each digit should be added individually using the push_back() function.

  4. Calculate the power of each digit: Iterate over the vector and calculate the power of each digit based on its position. To calculate the power, use the pow() function from the <cmath> header.

  5. Sum the powers: Sum the powers calculated in the previous step. Add each digit's power to the result variable.

  6. Output the result: Print or return the result.

Here is an example implementation:

#include <iostream>
#include <vector>
#include <cmath>

int main() {
    std::vector<int> digits;
    int result = 0;

    // Populate the vector with digits
    digits.push_back(1);
    digits.push_back(2);
    digits.push_back(3);

    // Calculate the power of each digit and sum them
    for (int i = 0; i < digits.size(); i++) {
        int power = std::pow(10, digits.size() - i - 1);
        result += digits[i] * power;
    }

    // Output the result
    std::cout << "The integer value is: " << result << std::endl;

    return 0;
}

In this example, the vector digits is populated with the digits 1, 2, and 3. The for loop iterates over the vector and calculates the power of each digit based on its position. The powers are then summed and stored in the result variable. Finally, the result is outputted as the integer value.