Program to swap positave and negative numbers in C

#include
#include
void sorting(int z,int a[])
 {   int x,y,t;
     for (x=z;x>0;x--)
     {

         for(y=0;y         {
              if(a[y]>a[y+1])//here we start swapping
              {
                  t=a[y];
                  a[y]=a[y+1];
                  a[y+1]=t;
              }
         }
     
     }  
     return;
     }
int main(void)
{
    int x=0,z,a[100],y,t;
    printf("Enter the positive numbers to be sorted and press a negative number to end input:\n");
    while(a[x-1]>=0)
    {
          scanf("%i",&a[x]);
          x=x+1;
    }
    z=x-2;
    printf("You have entered:\n");
    for(x=0;x<=z;x++) printf("%i\n",a[x]);
    sorting(z,a);//function call
    printf("Sorted array is:\n");
    for(x=0;x<=z;x++) printf("%d\n",a[x]);
getch();    
    return 0;
}