Thread: calloc

i am trying to make an array where user choses the size, and i dont seen able to get it right. What am I doing wrong?

Code:

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

double* makeAnArray(double size);
	int main (){
	int anArray()={0};
	int size=0;

	printf("Please enter the size of the array");
	scanf("%i", &size);

	makeAnArray(size);

	free(anArray);

	getchar();
}
double* makeAnArray(double size){
	int* array;
	array =calloc(size,sizeof(double));
	return *array;
}

This will compile. Start here:

Code:

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

double* makeAnArray(double size);

int main (void)
{
	int anArray[]={0};
	int size=0;

	printf("Please enter the size of the array");
	scanf("%i", &size);

	makeAnArray(size);

	free(anArray);

	getchar();
	
	return 0;
}
double* makeAnArray(double size)
{
	double* array;
	
	array =calloc(size,sizeof(double));
	
	return array;
}

i fixed

Code:

int anArray[]={0}

in the declarations
now when i run the program i get an error msg what is wrong with it?

i made all the corrections and it is still not working
this is the errror that i get
Windows has triggered a breakpoint in Assignment 8.1.exe.

This may be due to a corruption of the heap, which indicates a bug in Assignment 8.1.exe or any of the DLLs it has loaded.

This may also be due to the user pressing F12 while Assignment 8.1.exe has focus.

The output window may have more diagnostic information

i have been through my book and that was no help at all.
from what i get from it is that the array size has to be declared at he beggining and cannot be changed, but how am i supposed to have the user enter the size then???

Originally Posted by Elysia

That's why you use dynamic memory!
And we have told you multiple times that you need to receive the return from the function and then free it! But you aren't listening!
Perhaps you need to check out tutorials or better books.

Honestly, some new eyeglasses wouldn't hurt.

Oh, and the ability somehow to take the help that is given and put it to good use.

i have been strugling with this for quite a few days now. This is my first time using c so I am having an extremely hard time with it. I understand that you have been telling me the same thing yesterday and today, but certain things i do not understand and do not know how to do them. and thats why I am trying to get some more help.

Originally Posted by Elysia

take the return value of the function. Then you can free it.

I have searched online read books and I can not figure out how to this.
can you shouw me an example of it. I do not recall an example of this.