1. ./binaryToDecimalIterateOverCharacters.py
2. ./binaryToDecimalIterateOverExponents.py
3. ./binaryToDecimal.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 returns 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 returns 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 binary number into a decimal.
# Iterates over the exponents.
# Exercise: implement two ways:
#   --> iterate over the binary string from the last character to the first
#   --> iterate over the binary string from the first character to the last
# By CSCI111

import test

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


def testBinaryToDecimal():
    """
    tests the binaryToDecimal function
    """
    test.testEqual( binaryToDecimal("0"), 0 )
    test.testEqual( binaryToDecimal("1"), 1 )
    test.testEqual( binaryToDecimal("10"), 2 )
    test.testEqual( binaryToDecimal("11"), 3 )
    test.testEqual( binaryToDecimal("100"), 4)
    test.testEqual( binaryToDecimal("1101"), 13)
    test.testEqual( binaryToDecimal("10110"), 22)
    
    
    test.testEqual( binaryToDecimal("0000"), 0 )


    
def binaryToDecimal(binaryNum):
    """
    Converts binary number into a decimal number
    Pre: binaryNum should be a string containing only 0s and 1s
    Post: convert binaryNum into a decimal value and return that value
    as an integer
    """
    
    
    

testBinaryToDecimal()
#main()

# Demonstrate long strings and escape sequences
# by Sara Sprenkle

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

print(string)

print("\n") # how many blank lines does this print?

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\'.')


# how many blank lines does this print?
print("\n")


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