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New Term: C++ is case sensitive. In other words, uppercase and lowercase letters are considered to be different. A variable named age is different from Age, which is different from AGE. |
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Some compilers allow you to turn case sensitivity off. Don't be tempted to do this; your programs won't work with other compilers, and other C++ programmers will be very confused by your code. |
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Many programmers prefer to use all lowercase letters for their variable names. If the name requires two words (for example, my car), there are two popular conventions: my_car or myCar. The latter form is called camel-notation, because the capitalization looks something like a hump. |
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Some words are reserved by C++, and you may not use them as variable names. These are keywords used by the compiler to control your program. Keywords include if, while, for, and main. Your compiler manual should provide a complete list, but generally, any reasonable name for a variable is almost certainly not a keyword. |
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| DO | DON'T | | DO define a variable by writing the type, then the variable name. | DON'T use unsigned variables for negative numbers. | | DO use meaningful variable names. | DON'T use C++ keywords as variable names. | | DO remember that C++ is case sensitive. | | | DO understand the number of bytes each variable type consumes in memory, and what values can be stored in variables of that type. | |
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Creating More Than One Variable at a Time. |
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You can create more than one variable of the same type in one statement by writing the type and then the variable names, separated by commas. For example: |
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unsigned int myAge, myWeight; // two unsigned int variables
long area, width, length; // three longs |
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