What is the basic data type of C language?

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1. Data types contained in C language

As shown in the following figure:

2. Basic data types of C language

The six keywords short, int, long, char, float and double represent the six basic data types in the C language.

When formatting the output:

Int d

Short d

Long ld

Float f

Double lf

Char c

% x hexadecimal

% o Octal

% s string

% p generally outputs the value of the pointer as a hexadecimal integer with the prefix 0x

The memory size cut out by short on a 32-bit system is 2 byte

The memory size cut out by int is 4 byte.

The memory size cut out by long is 4 byte.

The memory size cut out by float is 4 byte.

The memory size cut out by double is 8 byte.

The memory size cut out by char is 1 byte.

(note: this refers to the general situation. Different platforms may be different. Specific platforms can be tested with the sizeof keyword.)

3. Sample code

/ / introduce the header file # include # include void main () {int i; printf ("Please enter an integer"); scanf ("% d", & I); printf ("% d\ n", I); float f = 10.01; printf ("% f\ n", f) / find the number of bytes occupied by a type, specifically related to the operating system printf ("bytes of int type% d\ n", sizeof (int)); printf ("bytes of float type% d\ n", sizeof (float)); printf ("number of bytes of double type% d\ n", sizeof (double)) / / the standard way to write a loop. Loop variables need to be extracted, otherwise int n = 0; for (; n) is compiled under GCC in Linux environment.