#include <stdio.h> int main() { double sum = 1.0; double de = 3.0; double num = 1.0; double tmp; unsigned long cnt= 0; while (1) {num= -num; tmp = num; tmp /= de; sum += tmp; de += 2; cnt++; if ( cnt > 10000000 ) {printf("1/%.0f - %19.17f\n", den, sum); cnt= 0;}}return 0;}