This type of function does not have input arguments but has a value to return to the main program.

**Write a program to calculate and print sum of first 50 even numbers.**

**Program:**

def sum_even():

sum=0

for i in range(1,51):

sum=sum+2*i

return sum

S=sum_even()

print("Sum of Even Number in Range 1 to 50: ", S)

**Output:**

Sum of Even Number in Range 1 to 50: 2550

**Write a program to input radius of a circle and calculate its area.**

def circle():

r=int(input("Enter radius of circle :"))

area=3.14*r*r

return(area)

A=circle()

print("The Area of circle is ", A)

**Output:**

Enter radius of circle :5

The Area of circle is 78.5

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