I wanna make a menu with C

Question

I want to make a menu for the calculation of resistance in parallel and in series, but when browsing the menu an error occurs. For example, I select "calculate in series", enter the number of resistors and finally the values ​​of the resistors, and get the result. but at the time of changing in "calculate in parallel" it no longer allows me to enter the number of resistors
https://code.sololearn.com/ceEHjG0NqRy0/?ref=app
https://code.sololearn.com/cBcS6sICLv41/?ref=app

Answer 1

Before the switch put

i = 1;

Answer 2

//Can you please post your source code, so we can further look into problem

Answer 3

length exceeds word limit

Please use code playground to post your code

https://www.sololearn.com/post/75089/?ref=app

Answer 4

Ready

Answer 5

//remove conio.h
and in line 19 you are doing opcion its option

https://code.sololearn.com/chZMYL3ZqLvD/?ref=app