variables
1. Variable is an entity that change during program execution. Example when we write r = 45 i.e. x can hold different value at different times so r is a variable.
2. A variable may be integer,character,float,double etc..
Rules for constructing Variable Names :
1. A variable name must be start with alphabet or underscore.
2. A variable name is any combination of 1 to 31 alphabets,digits or underscores.
3. No commas,special symbol(rather than underscore [ _ ] ) or blanks are allowed within a variable name
4. Example of valid variable names : ram, _ram, d_x, _voids, echo_,
Properties of variable in c:
Every variable in c have three most fundamental attributes. They are:
1. Name
2. Value
3. Address
Name of a variable:
Every variable in c has its own name. A variable without any name is name is not possible in c. Most important properties of variables name are its unique names. Not two variables in c can have same name with same visibility. For example:
#include<stdio.h>
int main(){
auto int a=5; //Visibility is within main block
static int a=10; //Visibility is within main block
/* Two variables of same name */
printf("%d",a);
return 0;
}
#include<stdio.h>
int main(){
auto int a=5; //Visibility is within main block
static int a=10; //Visibility is within main block
/* Two variables of same name */
printf("%d",a);
return 0;
}
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