1.Escape sequence(확장 문자열, 특정 기능을 하는 문자)
print("Hello, \nWorld!") #\n = Enter
print("Hello, \tWorld!") #\t = tap
print(".........\\never...")#\\ = to print "\"(back slash)
print("He said, \"Hello.\"") #\" = to print double quotation
2.Boolean(Logical data type)
#Data that indicates true and false situations
a = True
b = False
if True:
print("It's True")#space 4times
else:
print("It's False")
if False:
print("It's False")
else:
print("It's True")
3. Type Casting(conversion)
is converting one data type into another one.
1)int() #converting some data type into int type
str_to_int = int("123")
print(str_to_int, type(str_to_int)) #123 <class 'int'>
float_to_int = int(123.4)
print(float_to_int, type(float_to_int)) #123 <class 'int'>
2)float() #converting some data type into float type
str_to_float = float("123.4")
print(str_to_float, type(str_to_float)) #123.4 <class 'float'>
int_to_float = float(123)
print(int_to_float, type(int_to_float)) #123.0 <class 'float'>
3) str() #converting some data type into string type
int_to_str = str(123)
print(int_to_str, type(int_to_str)) #123 <class 'str'>
float_to_str = str(123.4)
print(float_to_str, type(float_to_str)) #123.4 <class 'str'>
4) bool() #converting some data type into boolean type
print(bool(0)) # 0, 0.0, " " => False, else => True
#input type casting
a = input("Please type number : ")
print("The number * 10 = ", result * 10)
print(type(a))
print("==================")
b = input("Please type number : ")
print("The number * 10 = ", int(b) * 10) # str -> int
print(type(b)) #BUT, the type is str not int, WHY?
print("==================")
c = int(a)
print(c, type(c))
print("==================")
d = float(a)
print(d, type(d))
#Practice
Get 3 numbers from the user.
Save Variables, n1, n2, n3
Calculate
n1 * n2 = ?
n1 * n2 / n3 = ?
Print the results.
