def f(k):
if k<=3:
print(k)
return
for i in range(1,4):
f(k-i)
执行语句f(6),则f(3)被调用的次数为( )
FOR A=5 TO 1
S=S+A
NEXT A
PRINT S
该程序的运行结果是( )
FOR A=1 TO 5 STEP -1