Python Program to Make a Simple Calculator

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In this program, we ask the user to choose the desired operation. Options 1,2,3 and 4 are valid. Two numbers are taken and an if...elif...else branching is used to execute a particular section. User-defined functions add(), subtract(), multiply() and divide() evaluate respective operations.
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#!/usr/bin/python

def add():
        print "Enter the two numbers to Add"
        A=int(raw_input("Enter A: "))
        B=int(raw_input("Enter B: "))
        return A + B

def sub():
        print "Enter the two numbers to Subtract"
        A=int(raw_input("Enter A: "))
        B=int(raw_input("Enter B: "))
        return A - B

def mul():
        print "Enter the two numbers to Multiply"
        A=int(raw_input("Enter A: "))
        B=int(raw_input("Enter B: "))
    return A * B

def div():
        print "Enter the two number to Divide"
        A=float(raw_input("Enter A: "))
        B=float(raw_input("Enter B: "))
        return A / B

print "1: ADDITION"
print "2: SUBTRACTION"
print "3: MULTIPLICATION"
print "4: DIVITION"
print "0: QUIT"

while True:

    CHOICE = int(raw_input("ENTER THE CORRESPONDING NUMBER FOR CALCULATION "))

    if CHOICE == 1:
        print 'ADDING TWO NUMBERS:'
        print add()

    elif CHOICE == 2:
        print 'SUBTRACTING TWO NUMBERS'
        print sub()

    elif CHOICE == 3:
        print 'MULTIPLYING TWO NUMBERS'
        print mul()

    elif CHOICE == 4:
        print "DIVIDEING TWO NUMBERS"
        print div()

    elif CHOICE == 0:
        exit()
    else:
        print "The value Enter value from 1-4"