File: main.c

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#include <assert.h>

int main() {
  _Bool b1, b2, b3;

  b1=0;
  b1++;
  assert(b1);

  b2=1;
  b2+=10;
  assert(b2);

  b3=b1+b2;
  assert(b3==1);

  // a struct of _Bool
  struct
  {
    _Bool f1, f2, f3;
    _Bool f4: 1, f5: 1;
  } s;

  assert(sizeof(s)==4);

  s.f1=2;
  assert(s.f1==1);

  s.f4=1;
  assert(s.f4);

  *((unsigned char *)(&s.f2))=1;
  assert(s.f2);
}