Pointer
practice.

One of the uses for function pointers in C is . . . . . . . .

Comment on the following pointer declaration.

int *ptr, p;

What will be the output of the following C code?

#include <stdio.h>
void f(int);
void (*foo)() = f;
int main(int argc, char *argv[])
{
    foo(10);
    return 0;
}
void f(int i)
{
    printf("%d\n", i);
}

What will be the output of the following C code?

#include <stdio.h>
void foo(int*);
int main()
{
    int i = 10, *p = &i;
    foo(p++);
}
void foo(int *p)
{
    printf("%d\n", *p);
}

What will be the output of the following C code?

#include <stdio.h>
void (*(f)())(int, float);
typedef void (*(*x)())(int, float);
void foo(int i, float f);
int main()
{
    x p = f;
    p();
}
void (*(f)())(int, float)
{
    return foo;
}
void foo(int i, float f)
{
    printf("%d %f\n", i, f);
}

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    struct student
    {
        int no;
        char name[20];
    };
    struct student s;
    s.no = 8;
    printf("%d", s.no);
}

What are the elements present in the array of the following C code?

int array[5] = {5};

What will be the output of the following C code?

#include <stdio.h>
struct student
{
    int no;
    char name[20];
};
void main()
{
    student s;
    s.no = 8;
    printf("hello");
}

What will be the output of the following C code?

#include <stdio.h>
void foo(float *);
int main()
{
    int i = 10, *p = &i;
    foo(&i);
}
void foo(float *p)
{
    printf("%f\n", *p);
}

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    char *a[10] = {"hi", "hello", "how"};
    int i = 0, j = 0;
    a[0] = "hey";
    for (i = 0;i < 10; i++)
    printf("%s\n", a[i]);
}

What is the correct syntax to send a 3-dimensional array as a parameter? (Assuming declaration int a[5][4][3];)

What will be the output of the following C code?

#include <stdio.h>
void f(int a[][])
{
    a[0][1] = 3;
    int i = 0, j = 0;
    for (i = 0;i < 2; i++)
    for (j = 0;j < 3; j++)
    printf("%d", a[i][j]);
}
void main()
{
    int a[2][3] = {0};
    f(a);
}

Which of following logical operation can be applied to pointers?
(Assuming initialization int *a = 2; int *b = 3;)

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    int k = 5;
    int *p = &k;
    int **m  = &p;
    printf("%d%d%d\n", k, *p, **m);
}

What are the different ways to initialize an array with all elements as zero?

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    int a[4] = {1, 2, 3, 4};
    int *ptr  =  &a[2];
    float n = 1;
    ptr = ptr + n;
    printf("%d\n", *ptr);
}

What is the size of *ptr in a 32-bit machine (Assuming initialization as int *ptr = 10;)?

What will be the output of the following C code?

#include <stdio.h>
void f(int (*x)(int));
int myfoo(int);
int (*foo)() = myfoo;
int main()
{
    f(foo);
}
void f(int(*i)(int ))
{
    i(11);
}
int myfoo(int i)
{
    printf("%d\n", i);
    return i;
}

Comment on the following 2 arrays with respect to P and Q.

int *a1[8];
int *(a2[8]);
P. Array of pointers
Q. Pointer to an array

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    int i = 10;
    void *p = &i;
    printf("%f\n", *(float*)p);
    return 0;
}