C compiler supports some basic types. These are char, short, int, long, float, double, long double, long long, and user defined types like structure and union. We will discuss mainly these basic types here. Below table gives information on these types long with their size and ranges.
| Type | Size | Signed Range | Unsigned Range |
| char | 1 | -128 to 127 | 0 - 255 |
| short | 2 | -32768 to 32767 | 0 - 65535 |
| int | 4 | -2147483648 to 2147483647 | 0 - 4294967295 |
| long | 4 | -2147483648 to 2147483647 | 0 - 4294967295 |
| float | 4 | 3.4E+38 to 3.4E-38 | 3.4E+38 to 3.4E-38 |
| double | 8 | 1.7E+308 to 1.7E-308 | 1.7E+308 to 1.7E-308 |
| long double | 10 | 1.7E+1032 to 1.7E-1032 | 1.7E+1032 to 1.7E-1032 |
| long long(_int64) | 8 | -9223372036854775808 to 9223372036854775807 | 0 - 18446744073709551615 |
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