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Calculator using If Statement in Python

Simple calculator using if-else statement in Python programming. In this tutorials you will learn how to write a simple calculator which allows you to add, subtract, and multiply integers values.

Program Using AND in If Statement

Program 

num = int(input("Enter value from 1 to 5: "))
if num >= 1 and num <= 5: #if 'num' value Less then or equal to 1 And
                          #gretter then OR equal to 5 then
    print("Welcome!") #print this.
else:  #if not then
    print("Invalid Entry!") #print this.
Output
Enter value from 1 to 5: 4
Welcome!

Program Using OR in If Statement

Program 

num = int(input("Enter value from 1 to 4: "))
if num == 1 or num == 2 or num == 3 or num == 4: #if 'num' value equal to 1
   #OR equal to 2 OR equal to 3 OR equal to 4 then
    print("Welcome!") #print this.
else: #if not then
    print("Invalid Entry!") #print this.
Output
Enter value from 1 to 4: 2
Welcome!

Program Calculator in If Statement

Program 

a = int(input("Enter First Integer: "))
op = input("Enter Operator: ")
b = int(input("Enter 2nd Integer: "))
if op == '+': #if 'op' value equal to '+' then
    print("Addition is: ", a + b) #print this.
elif op == '-': #if 'op' value equal to '-' then
    print("Subtraction is: ", a - b) #print this.
elif op == '*': #if 'op' value equal to '*' then
    print("Multiplication is: ", a * b) #print this.
else: #if not in above then
    print("Invalid Operator") #print this.
Output
Enter First Integer: 4
Enter Operator: *
Enter 2nd Integer: 11
Multiplication is: 44
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