#include <stdio.h>
 
int cmp(int x, int y)      // compare x and y
{
    return x > y;          // 1 if x > y, 0 otherwise
}
 
void swap(int *x, int *y)
{
    int tmp = *x;
 
    *x = *y;
    *y = tmp;
}
 
int main(void)
{
    int a[] = {3, 1, 4, 1, 5, 9, 2, 6, 5};  // array to be sorted
    size_t n = sizeof a / sizeof a[0];       // number of elements
 
    for (size_t i = 0; i < n - 1; ++i) {
        for (size_t j = 0; j < n - 1 - i; ++j) {
            if (cmp(a[j],a[j+1])) {
                swap(&a[j],&a[j+1]);
            }
        }
    }
 
    for (size_t i = 0; i < n; ++i) {
        printf("%d ", a[i]);
    }
 
    printf("\n");
 
    return 0;
}

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