Thread: function for largest value

If i want to find largest number in any sequence, I write program like this

Code:

 #include<stdio.h>

int main()
{
	int i = 0;
   int array[5] = {1, 2, 3, 4, 5};
   int largest = array[i];
  
   	for (i = 1; i <= 5; i++)
	{
		if ( largest < array[i])
			largest = array[i];
	}
	
	printf(" largest : %d ", largest);
	return 0;


}

I want to make a function that gives largest number. I don't know how to do it using function

Code:

#include<stdio.h>

void foo( int *ptr)
{
	int largest = *ptr;
	for (i = 1; i <= 5; i++)
	{
		
	}
	printf(" largest : %d ", largest);
}
int main()
{
   int i = 0;
   int array[5] = {1, 2, 3, 4, 5};
   foo(&array[0]);	
   
	return 0;


}

If you need to do this in a function because you want to use arbitrary sized arrays, the number of elements in the array must be passed to the function:

Code:

// return the position with the largest value
// or -1 if elems == 0.
unsigned int find_largest_int( int *p, unsigned int elems )
{
  unsigned int i, j;

  if ( ! elems ) return -1;

  for ( j = 0, i = 1; i < elems; i++ )
    if ( p[i] > p[j] )
      j = i;

  return j;
}

Example:

Code:

  int array[] = { 1, 2, 3, 7, 5, 6 };
  unsigned int largest;

  largest = find_largest_int( array, sizeof array / sizeof array[0] );

  // don't need to test for 'largest == (unsigned int)-1' because the array has elements...
  printf( "Found @%u: %d\n", largest, array[largest] );