#include <stdio.h> 
int a[4]; 
int y = 2; 

void function1(int a[],int b) 
{ 
  int i; 
  if (b>2) b=2; 
  for (i=0;i<b;i++) 
    a[i]+=a[i+1]; y=a[b]; 
} 

int function2(int z,int b) 
{ 
  y= z+b; 
  a[0] = y; 
  a[b] = a[0]-b; 
  return(y); 
} 

int main() 
{ int z=0; 
/* 1 */ a[0] = 1; a[1] = 2; a[2] = 3; a[3] = 4; y = a[y]; 
/* 2 */ z = function2(y,a[0]); 
/* 3 */ function1(a,3); 
/* 4 */ function1(a,function2(0,z-2)); 
 return(0); 
}