ARM button led

#include <LPC21xx.H>
#define s 0x00000080   //assigning P0.7 as s
void delay(int);
void delay(int m)
{
while(m--);
}

int main()
{
  IO0DIR |=(1<<6);
  //IO0DIR |= ~(1<<7);
  IO0DIR &= ~(s);
   IO0SET|=(1<<6);
  delay(650000);
 IO0CLR |=(1<<6);
while(1)
{
  IO0CLR |=(1<<6);
  //while(IO0PIN& (1<<7))
 while(IO0PIN& (s))
 {
  IO0SET|=(1<<6);
 }
}
}