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C# Data Types



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As explained in the variables chapter, a variable in C# must be a specified data type

int myNum = 5; // Integer (whole number)
double myDoubleNum = 5.99D; // Floating point number
char myLetter = 'D'; // Character
bool myBool = true; // Boolean
string myText = "Hello"; // String
 
A data type specifies the size and type of variable values. It is important to use the correct data type for the corresponding variable; to avoid errors, to save time and memory, but it will also make your code more maintainable and readable. The most common data types are
Data TypeSizeDescription
int4 bytesStores whole numbers from -2,147,483,648 to 2,147,483,647
long8 bytesStores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
float4 bytesStores fractional numbers. Sufficient for storing 6 to 7 decimal digits
double8 bytesStores fractional numbers. Sufficient for storing 15 decimal digits
bool1 bitStores true or false values
char2 bytesStores a single character/letter, surrounded by single quotes
string2 bytes per characterStores a sequence of characters, surrounded by double quotes
 
 
 

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