The isspace() function returns a non-zero if its argument is a single space, newline, tab, form feed, vertical tab, or carriage return.
If the argument is not a single space, newline, tab, form feed, vertical tab, or carriage return , then zero is returned.
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The ispunct() function returns a non-zero if its argument is a punctuation character. (All characters except alphanumeric or white-space). If the argument is not a punctuation character, then zero is returned.
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The function isprint() returns a non-zero if its argument is a printable character (including a white-space). If the argument is not a printable character (like the newline character ‘\n’ ) , then zero is returned.
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The islower() function returns a non-zero if its argument is a lowercase letter. If the argument is not a lowercase letter, then zero is returned.
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The function isgraph() checks if parameter is a character with graphical representation that can be printed. Whitespace characters like space are skipped. If the argument is not, then zero is returned.
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The function isdigit() returns a non-zero if its argument is a digit between 0 and 9. If its argument is not a digit between 0 and 9, then zero is returned.
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The iscntrl() function returns a non-zero if its argument is a control character. If there is no control character encountered, then zero is returned.
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The function isalpha() returns a non-zero if its argument is a letter of the alphabet. If it is not a letter of the alphabet, then zero is returned.
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The function isalnum() returns a non-zero if its argument is a letter of the alphabet or a numeric digit. If it is not letter of the alphabet or a numeric digit, then zero is returned.
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In this C programming language tutorial we will look at how to save content from an allocated piece of memory to a (binary) file. We also read it back from a (binary) file into memory and display the content.
Because the program example is longer than the usual examples that we use in our tutorials, we’ve split it into parts. Further down you’ll find an explanation for each part of the source. More »
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