目录
本期，我们将学习使用 Python 进行运算。
数学运算符号
- +
- 加
- -
- 减
- *
- 乘
- /
- 除
- %
- 求余
- **
- 幂
- //
- 取整除，返回整数部分
循环
从 1 开始循环十次：
for i in range (1,10)
例子
举个例子，假设我要编一个简易的加法计算器。
那么其代码就是
num1 = input ("Enter the first number: ")
num2 = input ("Enter the second number: ")
num1 = int (num1)
num2 = int (num2)
export = num1 + num2
print (export)
简易的减法计算器
num1 = input ("Enter the first number: ")
num2 = input ("Enter the second number: ")
num1 = int (num1)
num2 = int (num2)
export = num1 - num2
print (export)
简易的乘法计算器
num1 = input ("Enter the first number: ")
num2 = input ("Enter the second number: ")
num1 = int (num1)
num2 = int (num2)
export = num1 * num2
print (export)
简易的除法计算器
num1 = input ("Enter the first number: ")
num2 = input ("Enter the second number: ")
num1 = int (num1)
num2 = int (num2)
export = num1 / num2
print (export)
看了这些代码，是不是觉得很简单呢，要不来编一个九九乘法表吧。
实践
思路
- 程序询问 "Enter a num from 1-9\n"
- 用户输入数值
- 将 str 定义为 num
- 如果数字小于等于9，则打印乘法表
- 否则返回 "Error:\nPlease Input a num from 1-9."
代码
a = input ("Enter a num from 1-9\n")
a = int(a)
if a <= 9:
print (a, ":")
for i in range (1,10):
c = int(a*i)
print (a, "x", i, "=", c)
else:
print ("Error:\nPlease Input a num from 1-9.")
运行
Enter a num from 1-9 5 5 : 5 x 1 = 5 5 x 2 = 10 5 x 3 = 15 5 x 4 = 20 5 x 5 = 25 5 x 6 = 30 5 x 7 = 35 5 x 8 = 40 5 x 9 = 45
Enter a num from 1-9 9 9 : 9 x 1 = 9 9 x 2 = 18 9 x 3 = 27 9 x 4 = 36 9 x 5 = 45 9 x 6 = 54 9 x 7 = 63 9 x 8 = 72 9 x 9 = 81
完成！