C PROGRAMMING PROGRAM • POINTERS & DYNAMIC MEMORY
Access a Value Through a Pointer to a Pointer
Learn how to access a value through a pointer to a pointer using a clear C program.
PROBLEM UNDERSTANDING
Input and expected output
Sample input
No input required
Sample output
Value = 42
COMPLETE C PROGRAM
Complete C implementation
#include <stdio.h>
int main(void)
{
int value = 42;
int *pointer = &value;
int **double_pointer = &pointer;
printf("Value = %d\n", **double_pointer);
return 0;
}CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
No line selected
EXPECTED OUTPUT FOR THE SAMPLE
Value = 42
Step 0 of 0
PROGRAM EXPLANATION
Algorithm and explanation
- Read the required input values.
- Store the address of a pointer and dereference twice to reach the original integer.
- Display the computed result.
Store the address of a pointer and dereference twice to reach the original integer.
EFFICIENCY
Time and space complexity
Time complexity
O(1)
Auxiliary space
O(1)
DEBUGGING CHECKLIST
Common mistakes
Check this
Use the correct format specifier for every variable.
Check this
Initialize variables before using their values.
Check this
Check braces, semicolons and input order carefully.
Try it yourself
Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.