DS | Practical-2 | Dynamic Memory Allocation in C using malloc(), calloc(), free()

Dynamic Memory Allocation in C using malloc(), calloc(), free()

GTU Data Structure Practical-2

Introduction to Dynamic Memory Allocation. DMA functions malloc(), calloc(), free() etc.

malloc ()

1. #include<stdio.h>
2. #include<stdlib.h>
3. int main(){
4. int *ptr;
5. int n,i,sum=0;
6. printf("Enter Number of Elements: ");
7. scanf("%d",&n);
8. ptr=(int*)malloc(n*sizeof(int));
9. printf("Enter Elements of Array: ");
10. for(i=0;i<n;++i)
11. {
12. scanf("%d",ptr+i);
13. sum+=*(ptr+i);
14. }
15. printf("Sum=%d",sum);
16. free(ptr);
17. return 0;
18. }

Output

calloc ()

1. #include<stdio.h>
2. #include<stdlib.h>
3. int main(){
4. int n,i,*ptr,sum=0;
5. printf("Enter Number of Elements: ");
6. scanf("%d",&n);
7. ptr=(int*)calloc(n,sizeof(int)); //memory allocated using calloc
8. printf("Enter elements of array: ");
9. for(i=0;i<n;++i)
10. {
11. scanf("%d",ptr+i);
12. sum+=*(ptr+i);
13. }
14. printf("Sum=%d",sum);
15. free(ptr);
16. return 0;
17. }

Output

free() 

The memory occupied by malloc() or calloc() functions must be released by calling free() function. Otherwise, it will consume memory until the program exit.

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