Test for integer truncation

truncation_test.cpp

#include <stdio.h>

// TIL, this compiles without warnings with
// $ clang -Wall main.cpp -o testTruncation

// The following local pragmas may be used to activate warnings for this case,
// if you can't use -Wconversion globally.

// #pragma GCC diagnostic push
// #pragma GCC diagnostic warning "-Wconversion"

bool test(unsigned short a) {
  if (a < 0x20)
      return true;
  return false;
}

int main() {
  int testA = 0x90012;
  unsigned short testB = testA;
  printf("result for testA %x: %s\n", testA, test(testA) ? "true" : "false");
  printf("result for testB %x: %s\n", testB, test(testB) ? "true" : "false");
}

// #pragma GCC diagnostic pop