54 lines
881 B
C
54 lines
881 B
C
/*************************************************************************
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> File Name: sqrt.c
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> Author: jinshaohui
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> Mail: jinshaohui789@163.com
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> Time: 18-10-31
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> Desc:
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************************************************************************/
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#include<stdio.h>
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#include<string.h>
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#include<stdlib.h>
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#include<assert.h>
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/*求解精度设置*/
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#define E 0.000001
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double mybsearch(double num)
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{
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double start = 1.0;
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double end = num;
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double mid = 0.0;
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while(1)
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{
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mid = (start + end)/2;
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if(((mid*mid - num) <= E) && ((mid*mid - num) >= -E))
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{
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return mid;
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}
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if ((mid*mid - num) > E)
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{
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end = mid;
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}
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else
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{
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start = mid;
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}
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}
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return 0;
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}
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int main()
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{
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double num = 0.0;
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/*这里需要注意：double的输入方式*/
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scanf("%lf",&num);
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printf("\r\n num %lf的平方根是%lf",num,mybsearch(num));
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return 0;
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}
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