написан не правильно

Учись лучше ;-)

#include <stdio.h>

void main(void)
{

int count = 6;
int arr[count] = {0, 2, 1, 3, 5, 7};
int tmp;

printf("\n Base data : ");

for (int ii = 0;ii < count;++ii)
printf("%d " , arr[ii]);


for (int ii = 0;ii < count - 1;++ii)
for (int jj = ii + 1;jj < count;++jj)
if (arr[jj] > arr[ii])
{
tmp = arr[jj];
arr[jj] = arr[ii];
arr[ii] = tmp;
}

printf("\n Sorted data : ");
for (int ii = 0;ii < count;++ii)
printf("%d " , arr[ii]);
}