Memory Allocations – Let us C

Memory Reallocation

Pravesh Agrawal — Sat, 02 Dec 2023 11:14:51 +0000

#include 
#include 

int main() {
    // Memory reallocation
    int *dynamicArray;
    int newSize;

    dynamicArray = (int *)malloc(5 * sizeof(int));

    if (dynamicArray == NULL) {
        printf("Memory allocation failed.\n");
        return 1;
    }

    // Use the dynamically allocated array

    printf("Enter the new size of the array: ");
    scanf("%d", &newSize);

    dynamicArray = (int *)realloc(dynamicArray, newSize * sizeof(int));

    if (dynamicArray == NULL) {
        printf("Memory reallocation failed.\n");
        return 1;
    }

    // Use the resized array

    // Free the allocated memory
    free(dynamicArray);

    return 0;
}

Memory Allocation for Strings

Pravesh Agrawal — Sat, 02 Dec 2023 11:14:32 +0000

#include 
#include 
#include 

int main() {
    // Memory allocation for strings
    char *dynamicString;

    dynamicString = (char *)malloc(50 * sizeof(char));

    if (dynamicString == NULL) {
        printf("Memory allocation failed.\n");
        return 1;
    }

    // Use the dynamically allocated string

    // Free the allocated memory
    free(dynamicString);

    return 0;
}

Dynamic 2D Array Allocation

Pravesh Agrawal — Sat, 02 Dec 2023 11:14:15 +0000

#include 
#include 

int main() {
    // Dynamic 2D array allocation
    int rows, cols;

    printf("Enter the number of rows: ");
    scanf("%d", &rows);
    printf("Enter the number of columns: ");
    scanf("%d", &cols);

    int **dynamic2DArray = (int **)malloc(rows * sizeof(int *));
    for (int i = 0; i < rows; i++) {
        dynamic2DArray[i] = (int *)malloc(cols * sizeof(int));
    }

    // Use the dynamically allocated 2D array

    // Free the allocated memory
    for (int i = 0; i < rows; i++) {
        free(dynamic2DArray[i]);
    }
    free(dynamic2DArray);

    return 0;
}

Dynamic Array Allocation

Pravesh Agrawal — Sat, 02 Dec 2023 11:13:48 +0000

#include 
#include 

int main() {
    // Dynamic array allocation
    int *dynamicArray;
    int size;

    printf("Enter the size of the array: ");
    scanf("%d", &size);

    dynamicArray = (int *)malloc(size * sizeof(int));

    if (dynamicArray == NULL) {
        printf("Memory allocation failed.\n");
        return 1;
    }

    // Use the dynamically allocated array

    // Free the allocated memory
    free(dynamicArray);

    return 0;
}