hw060

$ cat hw060.c

#include <stdio.h>

int main() {

  int val1, val2;
  val2 = 10;
  val1 = ++val2 + ++val2 + ++val2;

  printf("%d %d\n", val1, val2);
}

$ clang -Wall -std=c11 -o ../../bin/hw060c hw060.c
hw060.c:8:10: warning: multiple unsequenced modifications to 'val2' [-Wunsequenced]
  val1 = ++val2 + ++val2 + ++val2;
         ^        ~~
1 warning generated.
$ gcc-9 -Wall -std=c11 -o ../../bin/hw060g hw060.c
hw060.c: In function 'main':
hw060.c:8:19: warning: operation on 'val2' may be undefined [-Wsequence-point]
    8 |   val1 = ++val2 + ++val2 + ++val2;
      |                   ^~~~~~
hw060.c:8:19: warning: operation on 'val2' may be undefined [-Wsequence-point]
$ ../../bin/hw060c
36 13
$ ../../bin/hw060g
37 13
$