My solution for this month’s Exercise took some terrible assumptions. First, that the strings are merely output and not stored. Second, that the strings are perfectly formed camelCase and snake_case. In this Lesson, I address the first concern.
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The challenge for this month’s Exercise is to convert a name from camelCase to snake_case and vice-versa. As usual, several approaches provide a possible solution. The directions were to output the results and not store them, so my solution is rather simple.
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In my code update for last week’s Lesson, I used return statements to send strings back to the main() function. This technique works — only once, even though the strings are declared static in the token() function.
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The Great Coding Wars host many battles. For example, VIM versus Emacs (add in Nano for extra military action). Also the fight between spaces and tabs for indenting. Add to these conflicts a minor skirmish: whether to use camelCase or snake_case naming conventions.
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I refer to the process of converting special characters into strings as tokenizing. The token is a character or string — a code. This code is translated into something else, which allows the program to deal with complex items in a simple manner.
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Unless the code must run endlessly, such as a program that operates a gas pump, an endless loop isn’t something you want. From last week’s Lesson, I crafted an endless loop to accept single-word input from the scanf() function to build a string. But no string is output because the loop never ends! It’s time to address this situation.
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Trying to salve my frustration with the scanf() function, I decided in last week’s Lesson to try to use scanf() to build a string. Because the function terminates standard input at the first whitespace character (space, tab, newline), the strings input must be stored and the string built in memory.
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The challenge for this month’s Exercise is to tally the digits in an integer, reporting the sum. You must use math and not cheat by looking at the old solution, which I didn’t. Promise.
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The scanf() function is useful for teaching, but it’s a booger. I avoid it outside of demonstration purposes. But it does provide good fodder for training beginning programmers to think about stream I/O.
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Seven years ago (to this same date!) I wrote an Exercise to tally the digits in a number. The solution required that the sum be reduced to a single digit. For example, the sum of digits in 12345 is 15, which is then reduced to six.
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