1、几何学：一个五边形的面积 编写一个程序，提示用户输入五边形顶点到中心的距离r，然后算出五边形的面积
import math
def calculate_of_pentagonal_area():
r = eval(input("Enter the length from the center to a vertex:"))
s = 2 * r * math.sin(math.pi/5)
area = 5 * s * s/(4 * math.tan(math.pi/5))
print("The area of the pentagon is %.2f"%area)
2、几何学：大圆的距离 大圆距离指的是球面上两点的距离，编写一个程序，提示用户输入地球表面两点维度，地球的平均半径为6371.01km
def calculate_of_spherical_distance():
x1,y1 = eval(input("Enter point 1 (latitude and longtitude)in degrees:"))
x2,y2 = eval(input("Enter point 2 (latitude and longtitude)in degrees:"))
radius = 6371.01
d = radius * math.acos(math.sin(math.radians(x1)) * math.sin(math.radians(x2)) +
math.cos(math.radians(x1)) * math.cos(math.radians(x2)) * math.cos(math.radians(y1-y2)))
print("The distance between the two points is %f"%d)
3、找出ASCII字符，接收一个ASCII码值（1-127），然后显示它对应的字符，
def find_real():
asc = eval(input("Enter an ASCII code: "))
ch = str(input("Enter the char number:"))
real = chr(asc)
char = ord(ch)
print("The character is %s"%real)
print("The ASC_num is %d"%char)
4、金融应用程序，工资表，读取下面信息，然后打印一个工资报表，雇员姓名，一周工作时间，每小时报酬，联邦预扣税，州预扣税率。
def print_salary():
name = str(input("Enter enployee's name:"))
work_wime = eval(input("Enter number of hours worked in a week :"))
pay_rate = eval(input("Enter hourly pay rate: "))
federal_tax = eval(input("Enter federal tax withholding rate:"))
tax_rate = eval(input("Enter state tax withholding rate:"))
gross_pay = work_wime * pay_rate
federal_without_holding = federal_tax * gross_pay
state_withoutholding = gross_pay * tax_rate
total_deduction = federal_without_holding + state_withoutholding
net_pay = gross_pay - total_deduction
print("Emplyee Name:%s" % name, "Hours Worked:%.3f" % work_wime, "Pay Rate:%.3f" % pay_rate,
"Gross Pay:%.3f" % gross_pay, sep="\n")
print("Deductions:")
print(" Federal Withoutholding (20.0):%.3f" % federal_without_holding,
" State withoutholding(9.0):%.3f" % state_withoutholding, "Total Deduction:%.3f" % total_deduction,
"Net Pay:%.3f" % net_pay, sep="\n")
if __name__ == '__main__':
print_salary()
常见的Python函数
| abs(x) |
返回x的绝对值 |
| max(x1,x2,…) |
返回最大值 |
| min(x1,x2,…) |
返回最小值 |
| – |
– |
| pow(a,b) |
返回a^b的值 |
| round(x) |
返回与x最接近的整数，如果x与两个整数接近程度相同，则返回偶数值 |
| – |
– |
| round(x,n) |
保留小数点n位小数点的浮点值 |
##数学函数
| fabs(x) |
将x看作一个浮点数，返回它的绝对值 |
| ceil(x) |
x向上取最近的整数，然后返回这个整数 |
| floor(x) |
x向下取最近的整数，然后返回这个整数 |
| – |
– |
| exp(x) |
返回幂函数e^x 的值 |
| log(x,base) |
返回以某个特殊值为底的x的特殊值 |
