Basic course of C language (ii) data types, variables, and operators (10)

3. Initialization of pointer type variable
For example:
Main ()
{
int *i=7899; /* Define integer pointer variable and initialize/*
float *f=3.1415926; /* Define floating point pointer variable and initialize/*
Char *s= "good"; /* Define character pointer variable and initialize/
.
.
.
}
Ii. Assignment of variables
A variable assignment is assigned to a specific value for a variable that is already described.
1. Assignment of a single variable
(1) integer variables and floating-point variables
Both of these variables are assigned in the following format
Variable name = expression;
For example:
Main ()
{
int A, m; /* Define local integer variable A, m*/
float N; /* Define local floating-point variable f*/
A=100, m=20; /* Assign value to variable * *
n=a*m*0.1;
.
.
.
}
Description
In Turbo C2.0, you can use a connection when assigning the same value to multiple variables.
For example:
Main ()
{
int A, b, C;
a=b=c=0; /* Assign value to a,b,c at the same time * *
.
.
.
}
(2) Character type variable
A character variable can be assigned a value in three ways.
For example:
Main ()
{
Char A0, A1, A2; /* Define local character type variables a0, A1, a2*/
A0= ' B '; /* Assign letter B to a0*/
a1=50; /* Assigns the number 2 (decimal ASCII value 50 to a1*/
A2= ' \x0d '; /* will enter assignments to a2*/
.
.
.
}
(3) Pointer type variable
For example:
Main ()
{
int *i;
Char *str;
*i=100;
Str= "Good";
.
.
.
}
*i says I is a pointer to an integer, that is, *i is an integer variable and I is an address that points to the integer variable.
*STR indicates that STR is a character pointer that retains a character address. At initialization time, STR has no special value, and when executing str= "good", the compiler reserves a space in the target file to hold a "good\0" string, and assigns the address of the first letter "G" of the string to STR, where the end of the string is automatically added by the compiler.