#include <stdio.h>
void undefined_subexpression() {
  int b, c;
  int a = 5;
  c = (b = a + 2) - (a = 1);
  printf("%d", c);
}

void comparison_unexpected() {
  int i, j, k;
  i = 10;
  j = 2;
  k = 0;
  // This is equivalent of (i < j) < k because it is < is left-associated
  // operator
  printf("\n%d", i < j < k);
}

void switch_playground() {
  int grade = 1;
  switch (grade) {
  /* case 0: */
  /*   printf("Failint"); */
  /*   break; */
  /* case 1: */
  /*   printf("Poor"); */
  /*   break; */
  /* case 2: */
  /*   printf("Average"); */
  /*   break; */
  /* case 3: */
  /*   printf("Good"); */
  /*   break; */
  /* case 4: */
  /*   printf("Excelent"); */
  /*   break; */
  /* default: */
  /*   printf("Illegal grade"); */
  /*   break; */
  /* } */
  case 0: case 1: case 2: case 3: case 4:
    printf("Allowed grades");
    break;
  default:
    printf("Illegal grade");
    break;
  }
}

int main() {
  int i = 5;
  float k = 1.1;
  float j = 10 * i + k;
  printf("%f\n", j);
  undefined_subexpression();
  comparison_unexpected();
  printf("\n");
  switch_playground();
}