#include<stdlib.h>
#include<stdio.h>
#include<math.h>
 
int main()
{
    /* «Обычные» переменные */
    int a = 1;
    float b = 2;
    double c = 3;
    /* Указатели */
    int *p1 = &a;
    float *p2 = &b;
    double *p3 = &c;
    void *p4 = NULL;
    /* Адреса «обычных» переменных и размер выделяемой памяти */
    printf("a:      int: start address %p extent %d\n",&a,sizeof(a));
    printf("b:    float: start address %p extent %d\n",&b,sizeof(b));
    printf("c:   double: start address %p extent %d\n\n",&c,sizeof(c));
    /* Адреса указателей и размер выделяемой памяти */
    printf("p1: pointer: start address %p extent %d\n",&p1,sizeof(p1));
    printf("p2: pointer: start address %p extent %d\n",&p2,sizeof(p2));
    printf("p3: pointer: start address %p extent %d\n\n",&p3,sizeof(p3));
    printf("p4: pointer: start address %p extent %d\n\n",&p4,sizeof(p4));
    /* Значения, на которые ссылаются указатели */
    printf("p1: %p related value %d\n",p1,*p1);
    printf("p2: %p related value %f\n",p2,*p2);
    printf("p3: %p related value %lf\n\n",p3,*p3);
}

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