squares

12:10:54|~/tmp
λ bat -p main.cpp
#include <iostream>

int square(int x) {
  return x * x;
}

int main(void) {
  int x = 1;
  for (int i = 0; i < 10; ++i) {
    if (square(x) < 0) {
      std::cout << "square(" << x << ") < 0" << std::endl;
    }
    x *= 10;
  }
}

12:10:58|~/tmp
λ clang++ main.cpp && ./a.out
square(1000000) < 0
square(1000000000) < 0

12:11:05|~/tmp
λ clang++ -O2 main.cpp && ./a.out

12:11:12|~/tmp
λ bat -p main.rs 
fn square(x: i32) -> i32 {
  x * x
}

fn main() {
  let mut x: i32 = 1;
  for _ in 0..10 {
    if square(x) < 0 {
      println!("square({}) < 0", x);
    }
    x *= 10;
  }
}

12:11:27|~/tmp
λ rustc main.rs && ./main 
thread 'main' panicked at 'attempt to multiply with overflow', main.rs:2:3
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

12:11:36|~/tmp
λ rustc -C opt-level=3 main.rs && ./main
square(1000000) < 0
square(1000000000) < 0