//press  switch 1  ------  display 0 to 9 nos
//press  switch 2  ------  display 9 to 0 nos
//press  switch 3  ------  display even nos
//press  switch 4  ------  display odd nos
//press  switch 5  ------  display prime nos

#define DELAY 500000

void setup() {
  // put your setup code here, to run once:
volatile char *dir1 = 0x30;
*dir1 = 0x00;

volatile char *dir2 = 0x107;
*dir2 = 0xff;
}

void loop() {
  // put your main code here, to run repeatedly:
volatile long x,i,j,k;
volatile char *input;
input =0x2f;

volatile char *output;
output = 0x108;
volatile int arr1[]={0x01,0x02,0x04,0x08,0x10};
volatile int arr2[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

while(1)
{
 for(k=0;k<6;k++)
 {
  x = *input;
  if((x & arr1[k]) == arr1[k]) 
  {
    if(x == 0x01){                          //press sw 1
        for(j=0;j<10;j++)                    
       {
          *output = arr2[j];              //count 0 to 9
          for(i=0;i<DELAY;i++);
       }
    }
    if(x == 0x02){                         //press sw 2
        for(j=9;j>0;j--)
       {
          *output = arr2[j];              //display 9 t0 0
          for(i=0;i<DELAY;i++);
       }
    }
    if(x == 0x04){                        //press sw 3
        for(j=0;j<10;j++)
       {
        if(j%2 == 0)                      //display even nos
          *output = arr2[j];
          for(i=0;i<DELAY;i++);
       }
    }
    if(x == 0x08){                      //press sw 4
        for(j=0;j<10;j++)
       {
        if(j%2 == 1)                    //display odd nos 
          *output = arr2[j];
          for(i=0;i<DELAY;i++);
       }
    }
    if(x == 0x10){                       //press sw 5
        volatile char prime,l;             
        for(j=2;j<10;j++)
       {
        prime =1;
        for(l=2;l<(j-1);l++)                 //prime nos
        {
          if(j%l == 0)
          {
            prime =0;
            break;
          }   
       }
          if(prime ==1)
          {
            *output = arr2[j];
          for(i=0;i<DELAY;i++);
          }
       }      
       }
    }
  }
     *output = 0;
}

 }