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Explain the scope rules related to the statement blocks in C language
The scope rules are related to the following factors −
- Accessibility of a variables.
- Period of existence of a variable.
- Boundary of usage of variables.
Scope rules related to statement blocks are given below −
Block is enclosed in curly braces which consists of set of statements.
Variables declared in a block are accessible and usable within that block and does not exist outside it.
Example 1
Following is the C program for scope rules related to statement blocks −
#include<stdio.h>
main ( ){
{
int i = 1;
printf ("%d",i);
}
{
int j=2;
printf("%d",j);
}
}Output
The output is stated below −
1 2
Even if the variables are redeclared in their respective blocks and with the same name, they are considered differently.
Example 2
Here is another C program for scope rules related to statement blocks−
#include<stdio.h>
main ( ){
{
int i = 1;
printf ("%d",i);
}
{
int i =2;
printf ("%d",i);
}
}Output
The output is stated below −
1 2
Redeclaration of variables within the blocks bearing the same names as those in the outer block masks the outer block variables, while executing the inner blocks.
Example 3
Here is another C program for scope rules related to statement blocks−
#include<stdio.h>
main ( ){
int i = 1;{
int i = 2;
printf ("%d",i);
}
}Output
The output is stated below −
2
Variables declared outside the inner blocks are accessible to the nested blocks, provided these variables are not declared within the inner block.
Example 4
Consider another program for scope rules related to statement blocks −
#include<stdio.h>
main ( ){
int i = 1;{
int j = 2;
printf ("%d",j);
printf ("%d",i);
}
}Output
The output is stated below −
2 1
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