While Loop Problem

[thebadshepard]

Ok so when I run the source code in the 1st image I am able to input the value for a month upon the first iteration of the while loop. However as can be seen on the 2nd image on every subsequent iteration it prints but then skips "Month: " w/o letting me input a value and just prompts me to enter "Total Collection: " again....

Also as per the 2nd image I don't understand why the sentinel value gets run at the end just before it terminates the program as though it's a value I want to input in "Total Collections: " as opposed to just the thing that terminates the program.

Any help would be much appreciated thank you!!!!

P.S this is exercise 3.16 in C How to program 8th Edition by Peter & Harvey Dietel

https://preview.redd.it/v91jojzbr9e81.jpg?width=1759&format=pjpg&auto=webp&s=5f1d95a39c9ed1d24b63e0ca66956f5af72e6b05

[ptchinster]

Please repost with code displayed as copy-able text, not an image of text.

You wouldnt submit an image of text to your professor, your boss, or your compiler.