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]

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1) Comment on the following pointer declaration.

 int *ptr, p;

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

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

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

 #include <stdio.h>
 int main()
 {
     int *ptr, a = 10;
     ptr = &a;
     *ptr += 1;
     printf("%d,%d/n", *ptr, a);
 }

4) 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;
 }

5) What will be the output of the program ?

 #include<stdio.h>
 int main()
 {
     static char *s[] = {"black", "white", "pink", "violet"};
     char **ptr[] = {s+3, s+2, s+1, s}, ***p;
     p = ptr;
     ++p;
     printf("%s", **p+1);
     return 0;
 }