Pointer in c

#include<stdio.h>

int main(){
    int num = 20;
    double grade = 4.54;
    double* gr = &grade;
    int* p = &num;
    printf("%p\n",sizeof(int*));
printf("%f\n", gr);
    printf("%p\n",p);
    printf("%d\n", *p);

return 0;
}