#include <stdio.h>
    int max(int x, int y)  {
      int z;
      if (x>y) z=x;
      else z=y;
      return(z);
    }

    int min(int x, int y)   {
      int z;
      if (x<y) z=x;
      else z=y;
      return(z);
    }

    int add(int x, int y)   {
      int z;
      z=x+y;
      return(z);
    }

    int process(int x, int y,int (*f)())  {
      int result;
      result=f();
      printf("%d\n", result);
    }

    main()  {
      int  a, b;
      printf("Please input a and b: \n");
      scanf("%d  %d", &a, &b);
      printf("max=");
      process(a, b, max);
      printf("min=");
      process(a, b, min);
      printf("sum=");
      process(a, b, add);
      while(1);
    }