foo.c: In function 'main':
foo.c:16:24: warning: left-hand operand of comma expression has no effect [-Wunused-value]
foo.c:16:27: error: incompatible types when assigning to type 'int[40]' from type 'int'
foo.c:17:24: warning: left-hand operand of comma expression has no effect [-Wunused-value]
foo.c:17:27: error: incompatible types when assigning to type 'int[40]' from type 'int'
foo.c:18:15: warning: left-hand operand of comma expression has no effect [-Wunused-value]
foo.c:18:18: error: incompatible types when assigning to type 'int[40]' from type 'int'