MALLOC , CALLOC, FREE AND REALLOC IN C

Abhishek Srivasatava

Total Post:70

Points:350
Posted by  Abhishek Srivasatava
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  1. Abhishek Srivasatava

    Post:70

    Points:350
    Malloc , calloc, free and realloc in C

    Malloc

    By using malloc we can create one block of memory requested dynamically which can be used as array etc. and return a pointer to 1st byte.

    Here is the small program to learn how to use malloc function.

    int main() 
    {
    int *num_mal; int num,i; printf(“Enter the number of element”); scanf(“%d”,&n); printf(“Enter the number of element”); scanf(“%d”,&n);
                       num_mal= (int*)malloc(num*(sizeof(int)));
                       for(i=0;i<5;i++)
                       {
                       num_mal[i]=1;
                       }
                       for(i=0;i<5;i++)
                       {
                       printf("%d",num_mal[i]);
                       }
                       }


    Calloc:

    By using Calloc  we can create multiple  block of memory requested dynamically which can be used as array etc. it fills the memory to zero and and return a pointer to 1st byte.

    Calloc initialize the memory to zero.

    Here is the small program to learn how to use calloc function.

    int main() 
    {
                       int *num_cal;
                       int num,i;
                       printf(“Enter the number of element”);
              scanf(“%d”,&n);
                       num_cal= (int*)calloc(num,(sizeof(int)));
                       for(i=0;i<5;i++)
                       {
                       num_cal[i]=1;
                       }
                       for(i=0;i<5;i++)
                       {
                       printf("%d",num_cal[i]);
                       }
                       }


    Free Function:

    To release the memory we need to use Free function;

    Syntax: free(num_mal);

     

    Realloc function:

    When we need to change the size of the memory allotted then we need to realloc function.

    Syntax:

    num_cal = (int*)calloc(num_cal,n);

      Modified On Oct-29-2016 12:39:30 AM

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