prog.c: In function ‘main’:
prog.c:9:14: warning: right-hand operand of comma expression has no effect [-Wunused-value]
for (health=0, health<=20, health++)()
^
prog.c:9:36: error: expected ‘;’ before ‘)’ token
for (health=0, health<=20, health++)()
^
prog.c:9:36: error: expected expression before ‘)’ token
prog.c:9:38: error: expected expression before ‘)’ token
for (health=0, health<=20, health++)()
^
prog.c:11:1: error: expected statement before ‘)’ token
)
^