#include <stdio.h>#include <math.h>int main(void){ double a,x1=1.0,x2; printf("please input a number: "); scanf("%lf",&a); x2=x1; x1=0.5*(x1+a/x1); for(;fabs(x1-x2)>=1e-5;) { x2=x1; x1=0.5*(x1+a/x1); } printf("a^1/2=%.10lf",x1);}