數(shù)據(jù)類型指定變量可以存儲(chǔ)的數(shù)據(jù)的類型,例如:整數(shù),浮點(diǎn),字符等。

C語(yǔ)言中有4種類型的數(shù)據(jù)類型。
| 類型 | 包含的類型 |
|---|---|
| 基本數(shù)據(jù)類型(Basic Data Type) | int, char, float, double |
| 派生數(shù)據(jù)類型(Derived Data Type) | array, pointer, structure, union |
| 枚舉數(shù)據(jù)類型(Enumeration Data Type) | enum |
| Void數(shù)據(jù)類型(void Data Type) | void |
基本數(shù)據(jù)類型是基于整數(shù)和基于浮點(diǎn)數(shù)。C語(yǔ)言支持有符號(hào)和無(wú)符號(hào)文字。
基本數(shù)據(jù)類型的內(nèi)存大小可能會(huì)根據(jù)32位或64位操作系統(tǒng)而有所變化。
下面來(lái)看看看基本的數(shù)據(jù)類型,下面是根據(jù)32位機(jī)器的架構(gòu)給出的大小范圍。
| 數(shù)據(jù)類型 | 內(nèi)存大小 | 范圍 |
|---|---|---|
| char | 1 byte | 1?128 to 127 |
| signed char | 1 byte | ?128 to 127 |
| unsigned char | 1 byte | 0 to 255 |
| short | 2 byte | ?32,768 to 32,767 |
| signed short | 2 byte | ?32,768 to 32,767 |
| unsigned short | 2 byte | 0 to 65,535 |
| int | 2 byte | ?32,768 to 32,767 |
| signed int | 2 byte | ?32,768 to 32,767 |
| unsigned int | 2 byte | 0 to 65,535 |
| short int | 2 byte | ?32,768 to 32,767 |
| signed short int | 2 byte | ?32,768 to 32,767 |
| unsigned short int | 2 byte | 0 to 65,535 |
| long int | 4 byte | -2,147,483,648 to 2,147,483,647 |
| signed long int | 4 byte | -2,147,483,648 to 2,147,483,647 |
| unsigned long int | 4 byte | 0 to 4,294,967,295 |
| float | 4 byte | - |
| double | 8 byte | - |
| long double | 10 byte | - |