#principal = p
#Annual_interest_rate = r
#year = n
#Compound_interest = c
p = eval(input('请输入本金:'))
r = float(input('请输入年利率:'))
n = eval
#principal = p
#Annual_interest_rate = r
#year = n
#Compound_interest = c
p = eval(input('请输入本金:'))
r = float(input('请输入年利率:'))
n = eval