53 lines
974 B
C
53 lines
974 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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int main() {
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int i;
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double precision = 1e-10 , x;
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printf("***輸入x值(x>0)計算平方根***\n");
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printf("輸入x值=> ");
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scanf("%lf",&x);
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double mid , lower , upper;
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if(x<0){
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printf("錯誤! X值不能<1");
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return 1;
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}
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if(x>1){
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lower=0 , upper=x , i=0;
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while (upper - lower > precision) {
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mid = (lower + upper) / 2.0;
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printf("#%d\t[%.10f,%.10f]\t解=%.10f\n",i+1,lower,upper,mid);
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i++;
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if (mid * mid > x) {
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upper = mid;
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} else {
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lower = mid;
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}
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}
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}
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if(x<1){
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lower=x , upper=1 ,i=0;
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while (upper - lower > precision) {
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mid = (lower + upper) / 2.0;
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printf("#%d\t[%.10f,%.10f]\t解=%.10f\n",i+1,lower,upper,mid);
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i++;
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if (mid * mid > x) {
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upper = mid;
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} else {
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lower = mid;
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}
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}
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}
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printf("%f的平方根為%.10f\n",x,mid);
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printf("sqrt(%f)的結果為%.10f\n",x,sqrt(x));
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return 0;
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}
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