prog.c: In function 'main':
prog.c:5:2: error: 'a' undeclared (first use in this function)
a, b int
^
prog.c:5:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:5:5: error: 'b' undeclared (first use in this function)
a, b int
^
prog.c:5:3: warning: left-hand operand of comma expression has no effect [-Wunused-value]
a, b int
^
prog.c:5:7: error: expected ';' before 'int'
a, b int
^