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C: While loop skips the first "scanf" on second iteration

原文 2022-01-27 18:11:47 6 1 c/ while-loop

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

1 answers

It's because you mix reading strings and numbers.

From the first scanf(), there's left a \n (return) from the user's previous answer.

He typed something+\n, and something gets consumed but not the \n.

The second scanf() reads until \n. This is, it reads nothing.

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