[C Programming] malloc과 fgets의 사용

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
 
void memoryAlloc (int a);
 
int main(int argc, char* argv[])
{
	int choice;
	fputs("Please enter the maximum length of string: ",stdout);
	scanf("%d",&choice);
	memoryAlloc(choice);
 
	return 0;
}
 
void memoryAlloc (int a){
 
	char* arr;
 
	arr = (char*)malloc( a * sizeof(char));
	if (arr == NULL){
		fputs("Failed to allocate memory!!!",stdout);
		exit(1);
	}
 
	fputs("Please enter strings: ",stdout);
	fgets(arr,sizeof(arr),stdin); // scanf("%s",arr);
 
	printf("Entered strings: %s\n",arr);
 
	fflush(stdin); 
	free(arr);
}