`lucproblem016.c`¶

Problem Statement

Figure 9.4 shows three memory locations and values stored in them. Write a program to declare variables that implement the relationship shown. How will you print the values and addresses shown in the figure? On which machine the program should be executed to get such addresses? Figure 9.4: value: 3.14, memory_address: 7fff9489c79c value: 7fff9489c7a0, memory_address: 7fff4fd134b8 value: 7fff9489c79c, memory_address: 7fff9489c7a0

Metadata¶

Property	Detail
Author	Amit Dutta (amitdutta4255@gmail.com)
License	MIT
Difficulty	Beginner (index: 2 / 10)

Concepts¶

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Recursion
Pointers

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Source Code¶

#include <stdio.h>

int main()
{
    float a = 3.14;
    float *c = &a;
    float **b = &c;

    printf("Location 1 (Variable a):\n");
    printf("Value: %g\n", a);
    printf("Address: %p\n", (void *)&a);
    printf("------------------------------\n");

    printf("Location 3 (Variable c: float *):\n");
    printf("Value (Address stored): %p\n", (void *)c);
    printf("Address of c itself: %p\n", (void *)&c);
    printf("Value pointed to (*c): %g\n", *c);
    printf("------------------------------\n");

    printf("Location 2 (Variable b: float **):\n");
    printf("Value (Address stored): %p\n", (void *)b);
    printf("Address of b itself: %p\n", (void *)&b);
    printf("Value pointed to (*b): %p\n", (void *)*b);
    printf("Value pointed to (**b): %g\n", **b);
    printf("------------------------------\n");

    return 0;
}

Explanation¶

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    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (lucproblem016.c):

    #include <stdio.h>

    int main()
    {
        float a = 3.14;
        float *c = &a;
        float **b = &c;

        printf("Location 1 (Variable a):\n");
        printf("Value: %g\n", a);
        printf("Address: %p\n", (void *)&a);
        printf("------------------------------\n");

        printf("Location 3 (Variable c: float *):\n");
        printf("Value (Address stored): %p\n", (void *)c);
        printf("Address of c itself: %p\n", (void *)&c);
        printf("Value pointed to (*c): %g\n", *c);
        printf("------------------------------\n");

        printf("Location 2 (Variable b: float **):\n");
        printf("Value (Address stored): %p\n", (void *)b);
        printf("Address of b itself: %p\n", (void *)&b);
        printf("Value pointed to (*b): %p\n", (void *)*b);
        printf("Value pointed to (**b): %g\n", **b);
        printf("------------------------------\n");

        return 0;
    }

lucproblem016.c¶