C-Language Basics-data types

I. Integer type: int

1. Introduction

In c, an integer constant consists of a sequence of one or more digits, and contains a positive or negative sign before the digit (plus, of course, can be omitted), there can be no space comma between the digits, and so on. Example: 12000,-190 is an int type, but 12,000 is not a valid int type.

2. Binary

I. Decimal: Commonly used in daily life of the system. The cardinality is 10, indicating to decimal, each digit number above the valid number is 0~9 (first bit not 0, for rigorous expression).

II. Eight binary: used in the computer. The cardinality is 8, indicating to octal that the valid number of each bit is 0~7. Usually if the first digit of the integer value is 0, then we think he is octal. Example: Octal 050 is represented as 40 (decimal).

Iii. 16 binary: An integer value the first bit with 0x we think of him as Hex. The base is 16, which indicates to 16, each single digit above the valid value is 0~9, the difference is 10~15 we use the abcdef to correspond to the expression. Example: 0xAAFFDD.

Two. Floating-point numeric type: float

1. Introduction

Data declared as floating-point in the C language is used to store numeric values that contain decimal digits. The identity of a floating-point value constant is a decimal number that can be omitted before the decimal point, or the number of digits after the decimal point can be omitted. For example: 3. Is allowed,-.002 is also allowed. Need to introduce is the scientific notation, this one sentence took: E is followed by a power of 10. For example 12000 is expressed in scientific notation for 1.2e4. The power of the 10 followed by this e can be negative.

Three. Extended Precision Type: double

1. Introduction

Similar to float, when float indicates that the range is insufficient, a double can be used instead.

Four. Single character type: Char

1. Introduction

Char is used in the C language to store a single character and is enclosed in single quotation marks. Example: ' A ', ', ', ' \ n ' are all possible \ nthe newline character, although it is two characters, but as a whole.

Five. Boolean data type: _bool

1. Introduction

Only two values stored by the _bool data type are 0 and 1. Where any non-0 value is stored as the 1,0 value is stored as 0. 1 stands for true, 0 for false.

C-Language Basics-data types