#include <stdio.h> #include <math.h> void main() { double a, xn, ketqua; printf("\nNhap vao so muon tinh can bac hai : "); scanf("%lf", &a); xn = (a+1)/2; do { ketqua = xn; xn = 0.5 * (xn + a/xn); } while (fabs(xn-ketqua) > 0.0001); printf("\nKet qua = %lf", xn); getch(); }