Can you combine the following two statements into one?

   char *p; 
   p

Can you combine the following two statements into one?

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

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1) 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;
 }

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 x = 0;
 void main()
 {
     int *ptr = &x;
     printf("%p\n", ptr);
     x++;
     printf("%p\n ", ptr);
 }

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()
 {
     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;
 }