What would be the equivalent pointer expression for referring the array element

What would be the equivalent pointer expression for referring the array element a[i][j][k][l]

2) What will be the output of the program ?

 #include<stdio.h>
 int main()
 {
     int i=3, *j, k;
     j = &i;
     printf("%d\n", i**j*i+*j);
     return 0;
 }

3) 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;
 }

4) What will be the output of the following C code?

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

 int *f()
 {
    int *j = (int*)malloc(sizeof(int));
    *j = 10;
    return j;
 }

5) Can you combine the following two statements into one?

   char *p; 
   p = (char*) malloc(100);