sum vector c++

To calculate the sum of a vector in C++, follow these steps:

1. Declare a vector variable: First, declare a vector of the desired data type (e.g., int, float, etc.) to store the elements. For example:

std::vector<int> numbers;

1. Add elements to the vector: Use the push_back() function to add elements to the vector. For example:

numbers.push_back(10);
numbers.push_back(20);
numbers.push_back(30);

1. Declare a variable to store the sum: Create a variable of the same data type as the vector to store the sum. For example:

int sum = 0;

1. Calculate the sum: Use a loop to iterate through each element in the vector and add it to the sum variable. You can use a for loop or a range-based for loop. Here's an example using a for loop:

for (int i = 0; i < numbers.size(); i++) {
    sum += numbers[i];
}

1. Output the sum: Finally, you can display the sum by printing the value of the sum variable. For example:

std::cout << "The sum is: " << sum << std::endl;

That's it! You've successfully calculated the sum of a vector in C++. Remember to include the necessary headers at the beginning of your program, such as <vector> for using vectors and <iostream> for input/output operations.