C代碼沒有按預期運行

Question

我寫了一個簡單的c程序，用newton-raphson迭代技術找到2,3,4,5的平方根。此代碼運行僅查找並顯示2的平方根。之後它掛起。我不能與此代碼找出問題：如果你有double替換float到處

# include<stdio.h> 

    float square(float x); 
    float absolutevalue(float x); 

int main(void) 
{ 
    printf("square root of 2 is %f\n", square(2)); 
    printf("square root of 3 is %f\n", square(3)); 
    printf("square root of 4 is %f\n", square(4)); 
    printf("square root of 5 is %f\n", square(5)); 

    return 0; 
} 

float square(float x) 
{ 
    float epsilon = 0.0000001; 
    float guess = 1; 

    while (absolutevalue(guess*guess - x) >= epsilon) 
     guess = ((x/guess) + guess)/2; 

    return guess; 
} 

float absolutevalue(float x) 
{ 
    if (x < 0) 
     x = -x; 

    return x; 
} 

Answer 1

一切都將正常工作。