Scope Tester
Easy
C
Variables
45 views
Problem Statement
Create nested blocks (outer, middle, inner). Use the same variable name 'x' in all three. Print the value at each level and understand which value is coming from which scope.
Input Format
No user input.
Nested blocks are created inside main().
Nested blocks are created inside main().
Output Format
Value of x printed at:
• outer block
• middle block
• inner block
• outer block
• middle block
• inner block
Example
Values assigned: • outer x = 10 • middle x = 20 • inner x = 30
10 20 30 20 10
Constraints
• Same variable name used
• C block scope rules apply
• C block scope rules apply
Concept Explanation
In C, a variable declared in an inner block hides the variable with the same name from the outer block.
Step-by-Step Explanation
1.Create an outer block and declare int x = 10.
2.Print x → prints 10.
3.Create a middle block inside outer block.
4.Declare another int x = 20.
5.Print x → prints 20 (middle block value).
6.Create an inner block inside middle block.
7.Declare another int x = 30.
8.Print x → prints 30 (inner block value).
9.Exit inner block and print x → prints 20.
10.Exit middle block and print x → prints 10.
2.Print x → prints 10.
3.Create a middle block inside outer block.
4.Declare another int x = 20.
5.Print x → prints 20 (middle block value).
6.Create an inner block inside middle block.
7.Declare another int x = 30.
8.Print x → prints 30 (inner block value).
9.Exit inner block and print x → prints 20.
10.Exit middle block and print x → prints 10.
Concept Explanation
In C, a variable declared in an inner block hides the variable with the same name from the outer block.
Step-by-Step Explanation
1.Create an outer block and declare int x = 10.
2.Print x → prints 10.
3.Create a middle block inside outer block.
4.Declare another int x = 20.
5.Print x → prints 20 (middle block value).
6.Create an inner block inside middle block.
7.Declare another int x = 30.
8.Print x → prints 30 (inner block value).
9.Exit inner block and print x → prints 20.
10.Exit middle block and print x → prints 10.
2.Print x → prints 10.
3.Create a middle block inside outer block.
4.Declare another int x = 20.
5.Print x → prints 20 (middle block value).
6.Create an inner block inside middle block.
7.Declare another int x = 30.
8.Print x → prints 30 (inner block value).
9.Exit inner block and print x → prints 20.
10.Exit middle block and print x → prints 10.
Input / Output Format
Input Format
No user input.
Nested blocks are created inside main().
Nested blocks are created inside main().
Output Format
Value of x printed at:
• outer block
• middle block
• inner block
• outer block
• middle block
• inner block
Constraints
• Same variable name used
• C block scope rules apply
• C block scope rules apply
Examples
Input:
Values assigned:
• outer x = 10
• middle x = 20
• inner x = 30
Output:
10
20
30
20
10
Example Solution (Public)
#include <stdio.h>
int main() {
int x = 10; // Outer block variable
printf("Outer block x = %dn", x);
{
int x = 20; // Middle block variable
printf("Middle block x = %dn", x);
{
int x = 30; // Inner block variable
printf("Inner block x = %dn", x);
}
// Back to middle block
printf("Middle block x (after inner) = %dn", x);
}
// Back to outer block
printf("Outer block x (after middle) = %dn", x);
return 0;
}
Official Solution Code
#include <stdio.h>
int main() {
int x = 10; // Outer block variable
printf("Outer block x = %dn", x);
{
int x = 20; // Middle block variable
printf("Middle block x = %dn", x);
{
int x = 30; // Inner block variable
printf("Inner block x = %dn", x);
}
// Back to middle block
printf("Middle block x (after inner) = %dn", x);
}
// Back to outer block
printf("Outer block x (after middle) = %dn", x);
return 0;
}
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