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Q: How many types of mamory variable in foxpro?
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How many memory variables can be defined in Foxpro?

The same as in other programming languages. A place to store a value. A variable may be of different types, including logical, string, numeric, or date. Here is an example that uses a variable: x = 5 ? "The square root of", x, " is ", sqrt(x). In FoxPro, it isn't necessary to declare variables. It is safer, though, in order to avoid conflicts between different modules, to declare the variable (usually with the LOCAL keyword if you use Visual FoxPro, or PRIVATE if you use the old FoxPro 1.x or 2.x). All variables are of a type which in some languages is called "variant", that is, the type can change at runtime.


Why Software Developer used to declare the variable type When declare the variable?

The variable declaration tells the compiler that the variable will be of a certain type. Thus, the compiler can (a) reserve an appropriate amount of space for the variable, and (b) do some checks that are otherwise not possible, such as avoiding operations with incompatible data types, at compile time.Some languages (I use Visual FoxPro) have only a single variable type, "variant". That is, the variable can actually change from one type to another at runtime, and it is stored in a way that allows this type-changing - precisely the "variant" type. Some versions of Basic have a "variant" type too. Unfortunately, that way many errors don't get caught during compilation, and will only appear later, at runtime. If you use a language that allows both specific types and variant types, better use the variant type sparingly, because of this.The variable declaration tells the compiler that the variable will be of a certain type. Thus, the compiler can (a) reserve an appropriate amount of space for the variable, and (b) do some checks that are otherwise not possible, such as avoiding operations with incompatible data types, at compile time.Some languages (I use Visual FoxPro) have only a single variable type, "variant". That is, the variable can actually change from one type to another at runtime, and it is stored in a way that allows this type-changing - precisely the "variant" type. Some versions of Basic have a "variant" type too. Unfortunately, that way many errors don't get caught during compilation, and will only appear later, at runtime. If you use a language that allows both specific types and variant types, better use the variant type sparingly, because of this.The variable declaration tells the compiler that the variable will be of a certain type. Thus, the compiler can (a) reserve an appropriate amount of space for the variable, and (b) do some checks that are otherwise not possible, such as avoiding operations with incompatible data types, at compile time.Some languages (I use Visual FoxPro) have only a single variable type, "variant". That is, the variable can actually change from one type to another at runtime, and it is stored in a way that allows this type-changing - precisely the "variant" type. Some versions of Basic have a "variant" type too. Unfortunately, that way many errors don't get caught during compilation, and will only appear later, at runtime. If you use a language that allows both specific types and variant types, better use the variant type sparingly, because of this.The variable declaration tells the compiler that the variable will be of a certain type. Thus, the compiler can (a) reserve an appropriate amount of space for the variable, and (b) do some checks that are otherwise not possible, such as avoiding operations with incompatible data types, at compile time.Some languages (I use Visual FoxPro) have only a single variable type, "variant". That is, the variable can actually change from one type to another at runtime, and it is stored in a way that allows this type-changing - precisely the "variant" type. Some versions of Basic have a "variant" type too. Unfortunately, that way many errors don't get caught during compilation, and will only appear later, at runtime. If you use a language that allows both specific types and variant types, better use the variant type sparingly, because of this.


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