How do you write a for-loop that prints every element of a vector in C plus plus?

Answer 1

The following function will print the contents of any vector of any type T which overloads the std::ostream::operator<< operator function.

template

std::ostream& print_elements (std::ostream& os, std::vector& vec) {

os << "{";

for (auto val : vec) os << val << ", ";

return os << "/b/b} ";

}

for (auto val : vec) is known as a range-for statement and can be interpreted as meaning "for each val in vec".

Note that /b is the backspace character. We use it here to backspace over the final comma and space before overwriting with a closing brace and a space.

Example usage:

std::vector vi {1, 3, 5, 7, 9};

std::vector vs {"the", "quick", "brown", "fox"};

print_elements (std::cout, vi);

print_elements (std::cout, vs);

Output:

{1, 3, 5, 7, 9}

{"the", "quick", "brown", "fox"}