maximum.c

#include <stdio.h>
#define SIZE 10
#define MAX(a,b) a > b ? a : b
 
int foo(int *x, int *y);
int bar(int *x, int size);

int main(void)
{
   int x[SIZE] = {5, 7, 3, 1, 8, 5, 3, 2, 4, 5};

   printf("foo: %d\n", foo(x, x + SIZE-1));
   printf("bar: %d\n", bar(x, SIZE));

   return 0;
}

int foo(int *x, int *y)
{
   if (x == y) { return *x; }
   return MAX(*x, foo(x + 1, y));
}
 
int bar(int *x, int size)
{
   int i = 0;
   int maior = x[0];

   if (size == 1) { return *x; }

   for (i = 1; i < size; i++) {
      if (x[i] > maior) { 
         maior = x[i];
      }
   }

   return maior;
}