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Everytime I look at some of the more expert code online I see things like %s and %d in some strings, especially in dialogs, but I have no idea what they are. I have googled the terms and I can't seem to find the answer and whether it is Delphi-bound or something common to every programming language.
I saw a post relating to C saying that it is used to "convert variables at runtime", how many arguments can we specify in a single string if this is the case?
Example usage:
ShowMessageFmt('Day %d = %s',[i,Days[i]]);
found at Delphi Basics.
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Minimum Field Width Specifier In the above program, %8d specifier displays the value after 8 spaces while %-8d specifier will make a value left-aligned.
Description. The Format function provides 'C' like formatting of multiple of simple data types into a string. It provides very precise control over this formatting. The Formatting parameter defines how the Data array is manipulated into the returned string.
The %d operator is used as a placeholder to specify integer values, decimals, or numbers. It allows us to print numbers within strings or other values. The %d operator is put where the integer is to be specified. Floating-point numbers are converted automatically to decimal values.
"%5d" Format a string with the required number of integers and also pad with spaces to the left side if integers are not adequate. "%05d" Format a string with the required number of integers and also pad with zeroes to the left if integers are not adequate.
Those are format strings, similar to those used in C printf(). They're also used by the Delphi Format function, which again is similar to printf() in C.
%d represents an integer. It will be replaced by the content of the variable i that is provided in the array that follows it.
%s represents a string. It will be replaced by the content of Days[i] that is passed in the array that follows it.
You can find more information in the Delphi documentation for SysUtils.Format, specifically in the sub-section regarding Format Strings.
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These are format strings that are passed to the Format function. Read all about it in the documentation.
Each placeholder in your format string is replaced by a value from the arguments open array. So, %d is replaced with the value of i, and %s is replaced with the value of Days[i].
The format string placeholders specify the data type and formatting information. So, %d is used to display an integer value in decimal representation, and %s is used to indicate a string.
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