Solution for Exercise 20-9

ex2009

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

int main()
{
    int *age;

    /* allocate memory */
    age = (int *)malloc(sizeof(int)*1);
    if(age==NULL)
    {
        puts("Out of Memory or something!");
        exit(1);
    }

    /* use memory */
    printf("How old are you in years? ");
    scanf("%d",age);
    *age *= 365;
    printf("You're over %d days old!\n",*age);

    /* free memory */
    free(age);

    return(0);
}

Output

How old are you in years? 39
You're over 14235 days old!

Notes

* As I wrote in the book, it's not necessary to use free() in this example as the program's memory, including all allocated storage, is freed when the program quits.

Exercise ex2010 →