C stdlib.h Library 🎯

Welcome to our deep dive into the C stdlib.h Library! This library is a treasure trove of functions that makes working in C easier and more efficient. Let's explore its wonders together.

What is stdlib.h? 📝

The stdlib.h is a standard library in C programming. It provides various utility functions that help in memory management, mathematical operations, string handling, and more.

Memory Management 💡

Memory management is crucial when working with C. The stdlib.h library offers functions to help manage memory efficiently.

malloc() 💡

malloc() is a function used to dynamically allocate memory of a specified size.

#include <stdlib.h>
int main() {
    int *ptr;
    int size = 10;
    ptr = (int *) malloc(size * sizeof(int));
    // Now you have an array of size 10
    // Remember to free memory when done!
    return 0;
}

free() 💡

free() is used to deallocate memory that was previously allocated using malloc().

#include <stdlib.h>
int main() {
    int *ptr;
    int size = 10;
    ptr = (int *) malloc(size * sizeof(int));
    // Use the memory
    free(ptr); // Deallocate memory when done
    return 0;
}

Math Operations 💡

stdlib.h library also provides functions for mathematical operations that aren't directly supported by C.

atoi() 💡

atoi() is a function that converts a string into an integer.

#include <stdlib.h>
#include <stdio.h>
int main() {
    char str[] = "123";
    int num = atoi(str);
    printf("Integer value of %s is %d\n", str, num);
    return 0;
}

String Handling 💡

String handling in C can be tricky, but stdlib.h comes to our rescue with several functions.

strcmp() 💡

strcmp() is a function used to compare two strings lexicographically.

#include <stdlib.h>
#include <stdio.h>
int main() {
    char str1[] = "Hello";
    char str2[] = "World";
    int result = strcmp(str1, str2);
    if(result < 0) {
        printf("%s comes before %s\n", str1, str2);
    } else if(result > 0) {
        printf("%s comes after %s\n", str1, str2);
    } else {
        printf("%s is equal to %s\n", str1, str2);
    }
    return 0;
}

Quiz Time! 🎯

Remember, the more you practice, the more you learn! Happy coding! 💻🎉