//
//		PI.c is a program taking in an integer n and then n floats from 
//	the standard in, and returns a table with values of cosine computed for x
//	values entered in.  The values are computed using the cosine function in 
//	the math.h library.
//
#include<stdio.h>
#include<math.h>

int main(void)
{
 float x[100];
 int i,n; 
 
 scanf("%i",&n); 
//	Checks to be sure n is less than 100.
 if(n>100||n<0) return 1;

 for(i=0;i<n;i++)
 {
  scanf("%f",x+i);
 }
//	Prints the header for the table.
 printf("i\t\tx_i\t\t\tCcos(x_i)\n");
//	Prints the table of cosine values.
 for(i=0;i<n;i++)
 {
  printf("%i\t\t%1.6f\t\t%1.6f\n",i,*(x+i),cosf(*(x+i)));
 }

 return 0;
}