prog.c: In function ‘main’:
prog.c:5:6: error: expected identifier or ‘(’ before ‘=’ token
int = 23, y =32, res;
^
prog.c:6:2: error: ‘res’ undeclared (first use in this function)
res = x + y;
^~~
prog.c:6:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:8: error: ‘x’ undeclared (first use in this function)
res = x + y;
^
prog.c:6:12: error: ‘y’ undeclared (first use in this function)
res = x + y;
^