File: main.c

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#include <assert.h>

extern int nondet_int();

int main()
{
  int z = nondet_int();
  int x = 0;
  __CPROVER_assume(z < 0 && z > -10);
  while(x < 100)
  {
    assert(z < x);
    int y = nondet_int();
    __CPROVER_assume(y > 0 && y < 10);
    x = x + y;
    z = z - x;
    assert(x < 150);
    if(z < -100)
      z = -z;
    assert(z < x);
  }
}