Thread: How to printf a function

Hello, I want to enter 4 numbers and display the largest possible number. Can anybody help me with this please? I have tried multiply different approaches, so do not wonder why there are so many libraries. Thanks in advance

Code:

#include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <math.h>           //pow
    #include <limits.h>         //char max
    #include <ctype.h>          //


int sort_alg(const void *a, const void *b)
{
    char ab[32], ba[32];
    sprintf(ab, "%d%d", *(int*)a, *(int*)b);
    sprintf(ba, "%d%d", *(int*)b, *(int*)a);
    return strcmp(ba, ab);
}

void max_numb(int *a, int len)
{
    int i;
    qsort(a, len, sizeof(int), sort_alg); 
    for (i = 0; i < len; i++)
        printf("%d", a[i]);
    putchar('\n');
}

int main(void)
{
  int numbers[4];
  for(int count = 0; count < 4; count++)
  {
      scanf("%d", &numbers[count]);
      printf("%d", numbers);
  }

    max_numb(numbers, sizeof(numbers)/sizeof(numbers[0]));

Another way:

Code:

#include <stdio.h>

#define NUMBER_COUNT  4

int max_numb(int a[], int len)
{
  int max = a[0], i;
  for (i = 1; i < len; i++)
    if (a[i] > max)
      max = a[i];

  return max;
}

int main(void)
{
  int numbers[NUMBER_COUNT];
  for (int count = 0; count < NUMBER_COUNT; count++)
  {
    scanf("%d", &numbers[count]);
    //printf("%d", numbers[count]);
  }

  int max = max_numb(numbers, NUMBER_COUNT);

  printf("\nMax: %d", max);

  return 0;
}

@OldGuy2
Sorry, but I am not trying to find the largest entered number. My code is intended to create the largest combined number with any numbers given: if you enter 1, 2, 99, 919 the number would be 9991921.

Thanks anyway

Thank you for your effort, but I want to enter some random numbers which then should be put together to create the largest possible number:

Code:

 1, 22, 77, 8, 9 -> 9877221.

The sorting and the algorithm would have worked just fine, but they only work if I use pre set numbers like:

Code:

 int x[] = {1, 99, 8, 444} and then max_numb(, sizeof(x)/sizeof(x[0]));

Please see my post below...