Step 1: Include the necessary header file for vectors: #include
Step 2: Declare a vector of integers: std::vector numbers;
Step 3: Add elements to the vector: numbers.push_back(3); numbers.push_back(5); numbers.push_back(7);
Step 4: Access and change elements using index: numbers[1] = 10;
Step 5: Iterate through the vector using a for loop: for (int i = 0; i < numbers.size(); i++) { std::cout << numbers[i] << " "; }
Step 6: Output the modified vector elements: Output: 3 10 7