Write a program in C to assist in circuit calculations (No previous knowledge in circuits is required)as follows:Create a function named menu that has no parameters and returns a character. The functiondisplays the following options:- R to calculate series resistance (R = R1 + R2).- P to calculate parallel resistance (1/R = 1/R1 + 1/R2).- T to calculate series capacitance (1/C = 1/C1 + 1/C2).- S to calculate parallel capacitance (C = C1 + C2).- V to calculate voltage across a resistor (V = I x R).- C to exit.The function menu should be displayed at the beginning of the program and every time a menuoption is carried out (redisplay the menu to do more calculations). The menu function shouldreturn the user choice to main.Create a function named validate that has no parameters and that returns a float. The functionrepeatedly asks the user for a value until a positive nonzero value is entered, then the functionreturns that value.Create a function named superman that accepts two float parameters and returns a float. Thisfunction returns F ( F = F1 + F2).Create a function named batman that accepts two float parameters and returns a float. Thisfunction returns F ( 1/F = 1/F1 + 1/F2). (Calculate for F)Create a function named robin that accepts two float parameters and returns a float. Thisfunction returns the product of the two parameters.After the user selects any of the above options, ask the user for a float value using the functionvalidate and assign the return of the function to a float variable name v1 in main. Ask the userfor another float value using the function validate and assign the return of the function to afloat variable name v2 in main.For Option R: Call the appropriate function (either superman or batman) on the values stored inv1 and v2. Output the return of the function with the values in v1 and v2 in a formattedstatement such as: The series resistance of 2.7 ohms and 5.1 ohms is 7.8 ohms.               For Option P: Call the appropriate function (either superman or batman) on the values stored inv1 and v2. Output the return of the function with the values in v1 and v2 in a formattedstatement.For Option T: Call the appropriate function (either superman or batman) on the values stored inv1 and v2. Output the return of the function with the values in v1 and v2 in a formattedstatement.For Option S: Call the appropriate function (either superman or batman) on the values stored inv1 and v2. Output the return of the function with the values in v1 and v2 in a formattedstatement.For Option V: Call the function robin on the values stored in v1 and v2. Output the return of thefunction with the values in v1 and v2 in a formatted statement.Option x exits.Prototype every function above main and place the function definition below main