#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

main() {
	
	float soma;
	int iCont;
	int termos = 50000;
	float mult;
	float termo;
	float denominador;
	
	
	for(soma = 0, iCont = 0; iCont < termos; iCont++){
		if(iCont % 2 == 0)
		  mult = 1;
		else
		  mult = -1;
		denominador = (2.0 * iCont + 1);  
		termo = (mult * 1.0) / (denominador);
		soma+= termo; 
		printf("%d -- %f\n", iCont, soma*4);
	}
	
	soma *= 4;
	
	
	
	return 0;
}