Verification for C variable pointer

# include<stdio.h>
# include<stdbool.h>
# include<stdlib.h>
int main()
{
    //This test is quite straight forward
    int data=123;
    int* p=&data;
    printf("Content of variable: %d\n",data);
    printf("Address of variable: %p\n",&data);
    printf("Content of pointer:  %p\n",p);
    printf("Derefer of pointer:  %d\n",*p);
    printf("Address of pointer:  %p\n",&data);
    return 0;
}

# include<stdio.h>
# include<stdbool.h>
# include<stdlib.h>
int main()
{
    //You can see from this test
    //The address of first element is the address of variable
    //The distance between elements is determined by the type of element.
    //So 4 for int, 1 for char
    int data[]={98,33,10};
    int* p=data;
    printf("Derefer of pointer:  %d\n",*p);
    printf("Derefer of pointer:  %d\n",*(p+0));
    printf("Derefer of pointer:  %d\n",*(p+1));
    printf("Address of variable: %p\n",&data);
    printf("Address of variable: %p\n",&data[0]);
    printf("Address of variable: %p\n",&data[1]);
    printf("Content of pointer:  %p\n",p);
    printf("Content of pointer:  %p\n",(p+0));
    printf("Content of pointer:  %p\n",(p+1));
    printf("Address of pointer:  %p\n",&p);
    return 0;
}

# include<stdio.h>
# include<stdbool.h>
# include<stdlib.h>
int main()
{
    //You can imagine there is a type called string
    //string data="rugal";
    //then every thing feels like them same as what have mentioned above
    char* p="rugal";
    //the %s option is different from others, it auto-derefer the data
    printf("Content of string : %s\n",p);
    printf("Derefer of pointer: %c\n",*p);
    printf("Derefer of pointer: %c\n",*(p+0));
    printf("Derefer of pointer: %c\n",*(p+1));
    printf("Content of pointer: %p\n",p);
    printf("Content of pointer: %p\n",(p+0));
    printf("Content of pointer: %p\n",(p+1));
    printf("Address of pointer: %p\n",&p);

    return 0;
}

# include<stdio.h>
# include<stdbool.h>
# include<stdlib.h>
void t1(int data)
{
    printf("T1 %d\n",data);
}
void t2(int data)
{
    printf("T2 %d\n",data);
}
void (*function)(int);
int main()
{
    function=&t1;
    function(6);
    function=&t2;
    function(232);
    printf("Content of t1     :%p\n",t1);
    printf("Content of t2     :%p\n",t2);
    printf("Address of t1     :%p\n",&t1);
    printf("Address of t2     :%p\n",&t2);

    printf("Content of pointer:%p\n",function);
    printf("Address of pointer:%p\n",&function);
    return 0;
}