牛顿拉普森迭代法

//计算某数的平方根  2   #include <stdio.h> 3   4   float absoluteValue(float x) 5   { 6       if(x<0) 7       { 8           x=-x; 9       }10       return x;11   } 12  13   //计算某数平方根的函数14   float squareRoot(float x)15   {16       const float epsilon=.00001;17       float guess=1.0;18  19       while(absoluteValue(guess*guess-x)>=epsilon)20       {21           guess=(x/guess+guess)/2.0; 22       }23       return guess; 24   } 25  26   int main()27   {28       float num;29       printf("输入要求平方根的数：");30       scanf("%f",&num);31       printf("%f平方根是%f\n",num,squareRoot(num));32       return 0; 33   }