*Program is in C*

What is wrong with the following code? #include #include int main() {int *p = (int *)malloc(sizeof(int)); p = NULL; free(p);} What is the output of the following program? #include #include void fun(int *a) {a= (int*)malloc(sizeof(int)); *a=1;} int main() {int *p=(int*)malloc(sizeof(int));; *p=6; fun(p); printf ("%d ", *p); return(0);}