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A minus sign indicates that the value is negative. Commas can't be used and no embedded spaces should be put between the digits.
Every value has a range of values associated with it. The range has to do with the amount of storage allocated to store a particular type of data. 64 bit systems can have a larger range than a 32 bit system.
Used to store values containing decimal digits. The NSLog conversion characters %f or %g can be used to display floats.
You can use a char variable to store a single character. You have to enclose the character within a pair of single quotation marks e.g. 'e' or ';' or 'p'. %c can be used to display char variables.
long int factorial;
The declared integer variable gets an extended range.
To display a long int you must use %li