Storage size overview in C - Mini Project: Build & Apply

Storage size overview

📖 Scenario: Imagine you are learning about how much space different types of data take in a computer's memory. This is important because knowing the size helps you use memory wisely in your programs.

🎯 Goal: You will write a simple C program that shows the storage size (in bytes) of different basic data types.

📋 What You'll Learn

Create variables of types char, int, float, and double

Create a variable called size_char to store the size of char

Use the sizeof operator to find sizes of the variables

Print the sizes with clear messages

💡 Why This Matters

🌍 Real World

Knowing the size of data types helps programmers write efficient code that uses memory wisely, which is important in embedded systems and performance-critical applications.

💼 Career

Understanding data sizes is a fundamental skill for software developers, especially those working in systems programming, embedded development, or performance optimization.

1

Create variables of basic data types

Create variables called c of type char, i of type int, f of type float, and d of type double.

C

#include 

int main() {
    // Create variables c, i, f, d of types char, int, float, double
    // Your code here

    return 0;
}

Need a hint?

Use the syntax type variable_name; to declare each variable.

2

Create a variable to store size of char

Create an int variable called size_char and set it to the size of the variable c using sizeof(c).

C

#include 

int main() {
    char c;
    int i;
    float f;
    double d;

    // Create int variable size_char and assign sizeof(c)
    // Your code here

    return 0;
}

Need a hint?

Use int size_char = sizeof(c); to get the size of c.

3

Find sizes of all variables

Create int variables called size_int, size_float, and size_double. Set each to the size of i, f, and d respectively using sizeof.

C

#include 

int main() {
    char c;
    int i;
    float f;
    double d;

    int size_char = sizeof(c);

    // Create int variables size_int, size_float, size_double
    // Assign sizes of i, f, d using sizeof
    // Your code here

    return 0;
}

Need a hint?

Use int size_int = sizeof(i); and similarly for others.

4

Print the sizes of all variables

Use printf to print the sizes stored in size_char, size_int, size_float, and size_double. Print messages exactly as: Size of char: X bytes, replacing X with the size value.

C

#include 

int main() {
    char c;
    int i;
    float f;
    double d;

    int size_char = sizeof(c);
    int size_int = sizeof(i);
    int size_float = sizeof(f);
    int size_double = sizeof(d);

    // Print sizes with printf
    // Your code here

    return 0;
}

Need a hint?

Use printf("Size of char: %d bytes\n", size_char); and similarly for others.