Basic data types for C language Basics-variables and constants

Variables and constants

You must declare a variable before using the variable. The syntax for a variable definition is:

For example, we can define an integer variable like this:

int A; int type denotes integral type

To declare multiple variables, you can declare them individually, or you can add multiple variable names after the data type name, separated by commas:

Data type name variable name 1, variable name 2, variable name 3;

You can assign a value to a variable while creating it, that is, initializing the variable. The syntax is:

Data type name Variable name = value;

It is a good idea to initialize variables when creating variables. This is because some compilers initialize to 0 by default, and some compilers perform operations such as output or arithmetic if the variables are not initialized, and the results you get will be random.

The definition of a constant, add a const keyword before the variable definition:

Const data type name Variable name = value;

When declaring constants, remember to initialize them, because constants can be assigned only when they are initialized, and in other cases assignments are not allowed. Once a constant is initialized, its value cannot be changed.

Try the knife, code the C language variables and constants.

#include <stdio.h> int main (void) {//Create an integer variable A, initialize to 1//create an integer constant Max, initialize to 100//write down your code int here      A = 1;      const int MAX = 100;       printf ("a=%d, max=%d", A, MAX);  return 0; }

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Basic data types for C language Basics-variables and constants