#functions
#function is a small code that is responcible for single task

#each function will have: name, parameters (could be empty list)
#and return value (could be void or no return value)

#writing function will involve two steps:
#writing function definition and using function (calling function)

#write a function that has two parameters and returns sum of the 
#parameters

#write a program that reads 4 integers, and finds sum of first two 
#number and sum of third and forth input

#function definition
#sum_two_ints - name of the function
#a and b - function parameters

def sum_two_ints(a, b):
	result = a+b
	return result

def main():
	num1=int(input("enter first num "))
	num2=int(input("enter second num "))
	num3=int(input("enter third num "))
	num4=int(input("enter forth num "))

	#function call

	result1=sum_two_ints(num1, num2)
	
	#1. program will jump to the function we wrote
	#2. a will be replaced with num1 value
	#3. b will be replaced with num2 value
	#4. function will calculate result which is num1+num2
	#5. function will return result and that will be assigned to
	#variable result1

	#function call again for num3 and num4
	
	result2=sum_two_ints(num3, num4)

	print("result1", result1)
	print("result2", result2)

main()