What is (void*)0?

What is (void*)0?

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1) What will be the output of the program ?

  #include<stdio.h>
  int main()
 {
     int x=30, *y, *z;
     y=&x; /* Assume address of x is 500 and integer is 4 byte size */
     z=y;
     *y++=*z++;
     x++;
     printf("x=%d, y=%d, z=%d\n", x, y, z);
     return 0;
 }

2) What will be the output of the program ?

 #include<stdio.h>
 int main()
 {
     char str[20] = "Hello";
     char *const p=str;
     *p='M';
     printf("%s\n", str);
     return 0;
 }

3) In which header file is the NULL macro defined?

4) Comment on the following C statement.

  const int *ptr;

5) 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;
 }