int*matrix; .....; free(void) matrix;

int*matrix; .....; free (matrix);

int*matrix; .....; if(matrix!=null) free(void*)matrix;

None of these

Passed to a function

Changed within a function

Returned by a function

Can be assigned an integer value

a and b are structures

a is structure and b is a pointer to a structure

a is a pointer to a structure and b is a structure

None of these

if(myPtr) *myPtr = NULL;
else *myPtr = NULL;

*myPtr = NULL;

if(!myPtr) *myPtr = NULL;
else *myPtr = NULL;

All of these

putchar ( * ( * (ptr+1) + 2));

putchar ( * (wer [1] + 2) ) ;

putchar (* (ptr+1) + 2);

none of the above