c - How do you use pointers to pass something to a function and then retrieve that same pointer in main? -

i'm having issues simple program. how can retrieve value of b after use in whatsbigger function? know need use pointers can't quite figure out. can try edit code , leave same names?

    #define     _crt_secure_no_warnings     #include    <stdio.h>     #include    <string.h>      int whatsbigger(int*, int*);      int main()     {         int x = 10;         int y = 25;         int *b;         int *biggest = b;         int b = whatsbigger(&x, &y);          printf("the biggest value is: %d\n", biggest);     }      int whatsbigger(int *p, int *p2)     {         scanf("%d\n", b);         int b;          if (*p > *p2)         {             p = b;         }         else         {             p2 = b;         }         return 0;     } 

#include    <stdio.h>  int *whatsbigger(int*, int*);  int main(void){     int x = 10;     int y = 25;     int *biggest = whatsbigger(&x, &y);      printf("the biggest value is: %d\n", *biggest); }  int *whatsbigger(int *p, int *p2){     return (*p > *p2) ? p : p2; }