Q23 Write a program to implement dynamic memory reallocation using realloc() function.

 

Write a program to implement dynamic memory reallocation using realloc() function.

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int index=0, i=0,n,*marks;
    int ans;
    marks = (int*)malloc(sizeof(int));
    if (marks == NULL) 
    {
        printf("Memory cannot be allocated");
    }
    else {
        printf("Memory has been successfully allocated by ""using malloc\n");
        printf("\nMarks = %pc\n",marks); 
        do {
            printf("\nEnter Marks ");
            scanf("%d", &marks[index]);
            printf("Would you like to add more(1/0):");
            scanf("%d", &ans);
            if (ans == 1) {
                index++;
                marks = (int*)realloc(marks,(index + 1)* sizeof(int));
                if (marks == NULL) 
                {
         printf("Memory cannot be allocated");
                }
                else {
printf("Memory has been successfully ""reallocated using realloc:\n");
printf("\nBase address of marks are:%pc",marks);
                }
            }
        } while (ans == 1);
        for (i = 0; i <= index; i++) {
        printf("Marks of students %d are: %d\n",i,marks[i]);
        }
        free(marks);
    }
    return 0;
}

Output

Memory has been successfully allocated by using malloc

Marks = 00DA2E78c

Enter Marks 90
Would you like to add more(1/0): 1 
Memory has been successfully reallocated using realloc:

Base address of marks are:00DA2E78c
Enter Marks 91
Would you like to add more(1/0): 1
Memory has been successfully reallocated using realloc:

Base address of marks are:00DA2E78c
Enter Marks 98
Would you like to add more(1/0): 1
Memory has been successfully reallocated using realloc:

Base address of marks are:00DA2E78c
Enter Marks 95
Would you like to add more(1/0): 0
Marks of students 0 are: 90
Marks of students 1 are: 91
Marks of students 2 are: 98
Marks of students 3 are: 95