데이터 구조 및 분석 ch_1_4 Variable Statements and Operators

Jul 3, 2021 » writing

KAIST 산업및시스템공학과 문일철_ 데이터 구조 및 분석 수업을 참고하여 작성하였습니다

ch_1_4 Variable Statements and Operators

정의

Variable Statements and Operators

1. Data Types
1) Numeric Data Type
- integer : signed interger, 32bit
- float : 64 bit double precision. like 1.23
- long integer : Large integer like 1.2333 L
- octal integer : base-8 integer
- hexadecimal integer : base-16 integer

2) String Data Type
- character string : ordered collection of characters

3) Collection Data Type
- list : ordered collection of object
- dictionary : collection of associated key data pairs
- tuple : similar to list

2. Variable Statements

def main() :
    numYearBase10 = 2021
    numYearBase8 = 0o3745
    numYearBase16 = 0x7e5
    # -> integer in decimal, octal, hexadecimal
    print("Year by base 10 : %d, by base 8: %d, by base 16 : %d"%(numYearBase10, numYearBase8, numYearBase16))

    numComplex1 = complex(3, 4)     # -> complex number
    numComplex2 = 4+3j

    print("Complex value : ", numComplex1)
    print("Absolute value : ", abs(numComplex2))
    print("Real value : ", numComplex2.real)    # -> 실수
    print("Image value : ", numComplex2.imag)   # -> 허수

    strDeptName = ("Industrial & System Engineering")
    strUnivName = ("KAIST")
    print("Department : ", strDeptName)
    print("Full name of dept : ", strDeptName, ", ", strUnivName)

main()

# Year by base 10 : 2021, by base 8: 2021, by base 16 : 2021
# Complex value :  (3+4j)
# Absolute value :  5.0
# Real value :  4.0
# Image value :  3.0
# Department :  Industrial & System Engineering
# Full name of dept :  Industrial & System Engineering ,  KAIST

3. Operator

def main() :
    numTest1 = 10
    numTest2 = 3.0
    numPlus = numTest1 + numTest2
    numMinus = numTest1 - numTest2
    numMultiply = numTest1 * numTest2
    numDivide = numTest1 / numTest2
    numModula = numTest1 % numTest2
    print("%d, %d, %d, %f, %d" %(numPlus, numMinus, numMultiply, numDivide, numModula))
    # -> +, -, *, /, % (modulo operator)
    numDivideInt = numTest1 /int(numTest2)      # -> how to int, type casting
    print(numDivide, numDivideInt)

    numTest2, numTest1 = numTest1, numTest2     # -> swapping statement
    print(numTest1, numTest2)
    print(numTest1 == numTest2)     # == equivalence
    print(numTest1 != numTest2)     # != in-equivalence
    print(type(numTest1))

    numTest1 = str(numTest1)    # -> how to str, type casting
    print(type(numTest1), numTest1)

    strFormula = "2021 / 100"
    print(eval(strFormula))
main()

# 13, 7, 30, 3.333333, 1
# 3.3333333333333335 3.3333333333333335
# 3.0 10
# False
# True
# <class 'float'>
# <class 'str'> 3.0
# 20.21