1. binaryToDecimalIterateOverCharacters.py
2. binaryToDecimalIterateOverExponents.py
3. decimalToBinary.py
4. demo_str.py
5. escape_sequences.py

# Converts a binary number into a decimal.
# Iterates over the characters in the string,
# i.e., from left to right in the string.
# By CSCI111

import test

def main():
    print("This program converts a binary number into a decimal number.")
    
    binaryNum = input("What is your binary number? ")
    decVal = binaryToDecimal(binaryNum)
    print("The decimal value of", binaryNum, "is", decVal)


def testBinaryToDecimal():
    test.testEqual(binaryToDecimal("0"), 0)
    test.testEqual(binaryToDecimal("1"), 1)
    test.testEqual(binaryToDecimal("1000"), 8)
    test.testEqual(binaryToDecimal("1111"), 15)
    test.testEqual(binaryToDecimal("10110"), 22)
    
def binaryToDecimal(binary):
    """
    Pre: binary should be a string containing only 0s and 1s
    Post: converts binary into a decimal value and return that value
    """
    decVal = 0
    exponent = len(binary)
    
    for char in binary:
        bit = int(char)
        exponent -= 1
        decVal += bit * 2**exponent
        
    return decVal
    
#testBinaryToDecimal()
main()

# Converts a binary number into a decimal.
# Iterates over the exponents,
# i.e., from right to left over the binary number.
# By CSCI111

import test

def main():
    print("This program converts a binary number into a decimal number.")
    
    binaryNum = input("What is your binary number? ")
    decVal = binaryToDecimal(binaryNum)
    print("The decimal value of", binaryNum, "is", decVal)


def testBinaryToDecimal():
    test.testEqual(binaryToDecimal("0"), 0)
    test.testEqual(binaryToDecimal("1"), 1)
    test.testEqual(binaryToDecimal("1000"), 8)
    test.testEqual(binaryToDecimal("1111"), 15)
    test.testEqual(binaryToDecimal("10110"), 22)

    
def binaryToDecimal(binary):
    """
    Pre: binary should be a string containing only 0s and 1s
    Post: converts binary into a decimal value and return that value
    """
    decVal = 0
    for exponent in range(len(binary)):
        index = len(binary) - (exponent + 1)
        char = binary[index]
        if char == "1":
            decVal += 2**exponent
        # Alternative: 
        # bit = int(char)
        # decVal += bit * 2 ** exponent
    
    return decVal
    
testBinaryToDecimal()
#main()

# Converts a decimal number into binary
# By CSCI111

import test

def main():
    print("This program converts a decimal number into a binary number.")
    decNum = int(input("Enter a decimal number: "))
    print(decNum, "has a binary value of", decimalToBinary(decNum))


def testDecimalToBinary():
    """
    tests the binaryToDecimal function
    """
    test.testEqual( decimalToBinary(0), "0")
    test.testEqual( decimalToBinary(1), "1")
    test.testEqual( decimalToBinary(2), "10")
    test.testEqual( decimalToBinary(22), "10110")


    
    
def decimalToBinary(decimal):
    """
    
    """
    if decimal == 0:
        return "0"
    # Initialize the result to the empty string
    result = ""
    # Repeat until the decimal is 0:
    while decimal > 0:
        result = str(decimal % 2) + result
        decimal = decimal // 2
    # Return the result
    return result
    
        

testDecimalToBinary()
#main()

# Demonstrate long strings and escape sequences
# by Sara Sprenkle

string = """This is a long string.
Like, really long.
Sooooo loooooong"""

print(string)

print("To print a \\, you must use \"\\\\\"")

# Practice with escape sequences
# By CS111

# Display To print a tab, you must use '\t'.
print("To print a tab, you must use \'\\t\'.")
print("To print a tab, you must use '\\t'.")
print('To print a tab, you must use \'\\t\'.')


# Display I said, "How are you?"
print("I said, \"How are you?\"")
print('I said, "How are you?"')