Thread: Need help with calloc

Hello everyone I am working on a c program for a class and I am having issues with calloc. I am using calloc to create a dynamic array and then trying to store elements into that array after initialization. However, after I run my code everytime, I only have zeros in the array.

Code:

/* Chapter8Homework#3 */


#include <stdio.h>
#include <stdlib.h>




int main(void)
{
    int x = 0, k = 0;
    float *array_size;
    printf("Please enter a number for the size of an array: ");
    scanf("%d", &x);
    array_size = (float *)calloc(x, sizeof(float));
    for(k=0;k<x;k++)
    {
        printf("Enter a number: ");
        scanf("%f", array_size + k);
    }
    for(k=0;k<x;k++)
    {
        printf("The number at element %d is %f\n", k, array_size + k);
    }
    return 0;
}

If anyone could help me out that would be much appreciated. I am really quite stuck because it seems to not make sense. Any help would be awesome. Thanks in advance!

Code:

scanf("%f", &k);

Your second scanf() should be this ^^

Don't typecast malloc()/calloc() > FAQ > Casting malloc - Cprogramming.com

Code:

int x= 0, k = 0;
/* ... */
scanf("%d", &k);
/* ... */
for (k = 0; /* ... */ ) {

No need to initialize them twice, both scanf() and the initial initialization of a for() loop take of that.

Originally Posted by memcpy

Code:

scanf("%f", &k);

Your second scanf() should be this ^^

Don't typecast malloc()/calloc() > FAQ > Casting malloc - Cprogramming.com

Code:

int x= 0, k = 0;
/* ... */
scanf("%d", &k);
/* ... */
for (k = 0; /* ... */ ) {

No need to initialize them twice, both scanf() and the initial initialization of a for() loop take of that.

I think I understand what you are doing but if I were trying to use k as the counter to store whatever the user enters during that for loop into that array that I create with the calloc function would your code still be how I do that? I need the value entered into the scanf to be stored in array starting with the first element of which I thought was returned to me after I did the calloc call. Not sure if I am on the right track or not..