Yes, Rust is better. Implicit numeric conversion is terrible. However, don't use atoi if you're writing C++ :-). The STL has conversion functions that will throw, so separate problem.
replies(3):
Yes, you can ask the std::sto* functions for the position where they stopped because of invalid characters and see if that position is the end of the string, but that is much more complex than should be needed for something like that.
These functions don't convert a string to a number, they try to extract a number from a string. I would argue that most of the time, that's not what you want. Or at least, most of the time it's not what I need.
atoi has the same problem of course, but even worse.
To get the equivalent of Rust's
if let Ok(x) = input.parse::<i32>() {
println!("You entered {x}");
} else {
eprintln!("You did not enter a number");
}
int x{};
auto [ptr, ec] = std::from_chars(input.data(), input.data() + input.size(), x);
if (ec == std::errc() && ptr == input.data() + input.size()) {
std::cout << "You entered " << x << std::endl;
} else {
std::cerr << "You did not enter a valid number" << std::endl;
}
Maybe I'm weird for mostly writing code that does straightforward input-to-number conversions and not partial string parsers, but I have yet to see a good alternative for Rust's parse().