Answer to Question #259354 in Python for NeroTamil

Question

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Answer 1

SOLUTION FOR THE ABOVE QUESTION

In this solution we will develop a python program that takes an expression as an input and prints its results. The expression should consist of only four operations i.e. addition(+),

subtraction(-), multiplication(*) and exponential(^). It does not obey the BODMAS except for the brackets i.e. (). as per the question requirements.

SOLUTION CODE

#This program has only four possible operations, i.e addition subraction, multiplication
# and exponential
#lets define the methods for all these

import math

#defining a method for addition
def addition(first_number, second_number):
    return first_number+second_number;

#defining a method for subtraction
def subtraction(first_number, second_number):
    return first_number-second_number;

#defining a method for multiplication
def multiplication(first_number, second_number):
    return first_number*second_number;

#defining a method for power
def power_function(number, power_raise):
    return pow(number,power_raise);

#prompt the user to enter the expression
my_expression = input("\nEnter  your expression: ")
my_expression_length = len(my_expression)
while_terminate_condition = 0;
my_new_expression = ""
while while_terminate_condition < my_expression_length:
    if(my_expression[while_terminate_condition]=="("):
        while_terminate_condition = while_terminate_condition + 1;
        variable_1 = int(my_expression[while_terminate_condition])
        while_terminate_condition = while_terminate_condition + 1;
        my_operator = my_expression[while_terminate_condition]
        while_terminate_condition = while_terminate_condition + 1;
        variable_2 = int(my_expression[while_terminate_condition])
        while_terminate_condition = while_terminate_condition + 2;
        if my_operator == "+":
            my_new_expression = my_new_expression+str(addition(variable_1,variable_2))
        elif my_operator == "-":
            my_new_expression = my_new_expression + str(subtraction(variable_1, variable_2))
        elif my_operator == "*":
            my_new_expression = my_new_expression + str(multiplication(variable_1, variable_2))
        else:
            my_new_expression = my_new_expression + str(power_function(variable_1, variable_2))

    else:
        my_new_expression = my_new_expression + my_expression[while_terminate_condition]
        while_terminate_condition = while_terminate_condition + 1;

#Now we have our new expression with brackets taken care of
#lets evaluate the expression now
my_new_expression_length = len(my_new_expression)
new_terminate_condition = 0
#declare the final result variable and initialize it to the fisrt element of
# the new exepression so that it can be accesible outside the while block
final_result = int(my_new_expression[new_terminate_condition]);
new_terminate_condition = new_terminate_condition + 1;
while new_terminate_condition<my_new_expression_length:
    #get the operator
    my_operator = my_new_expression[new_terminate_condition]
    new_terminate_condition = new_terminate_condition + 1;
    #get the operand
    my_operand = int(my_new_expression[new_terminate_condition])
    new_terminate_condition = new_terminate_condition + 1
    if my_operator == "+":
        final_result = addition(final_result,my_operand)
    elif my_operator == "-":
        final_result = subtraction(final_result,my_operand)
    elif my_operator == "*":
        final_result = multiplication(final_result, my_operand)
    else:
        final_result = power_function(final_result,my_operand)


#print your final result
print("Your Expression evaluates to: "+str(final_result))

SAMPLE PROGRAM OUTPUT