math.h

来源： https://stackoverflow.com/questions/46722261/lm-doesnt-work-unless-its-at-the-end-of-the-command

来源： https://stackoverflow.com/questions/46722261/lm-doesnt-work-unless-its-at-the-end-of-the-command

来源： https://stackoverflow.com/questions/46722261/lm-doesnt-work-unless-its-at-the-end-of-the-command

问题 This question already has answers here : How does C compute sin() and other math functions? (22 answers) Closed 6 days ago . I tried to convert C code that is written under Linux (fedora 9) to assembly x86 code, however, I have problem in a Math.h functions. The functions in this library such as ceil, floor, log, log10, pow are undefined in the assembly x86. Can you please help me to solve this problem? Thanks. 回答1: Most library functions won't be defined in assembly language, at least not in

问题 Why does the following bit of code work in C: int res = pow(2, 3); printf("%d\n", res); while this other doesn't? int a = 2; int b = 3; int res = pow(a, b); printf("%d\n", res); Even if I try double a = 2; double b = 3; double res = pow(a, b); printf("%f\n", res); I get an undefined reference to `pow' What am I doing wrong? 回答1: When it works, it's because the calculation was done by the compiler itself (and included in the binary as if you wrote it out) printf("8\n"); When it doesn't work,

问题 I have a fairly complicated function that takes several double values that represent two vectors in 3-space of the form (magnitude, latitude, longitude) where latitude and longitude are in radians, and an angle. The purpose of the function is to rotate the first vector around the second by the angle specified and return the resultant vector. I have already verified that the code is logically correct and works. The expected purpose of the function is for graphics, so double precision is not

问题 I have a fairly complicated function that takes several double values that represent two vectors in 3-space of the form (magnitude, latitude, longitude) where latitude and longitude are in radians, and an angle. The purpose of the function is to rotate the first vector around the second by the angle specified and return the resultant vector. I have already verified that the code is logically correct and works. The expected purpose of the function is for graphics, so double precision is not

问题 //test.cpp fmod( pow(2.0,127),467 );// Return result as 132 <-- correct answer When i using my own implementation int mod( int dividend , int divisor ){ return (dividend % divisor + divisor ) % divisor; } int a = mod ( pow(2.0,127),467 );// Wrong result , 441 //or direct use int a = pow(2.0,127); int b = a%467 // Will return wrong result , -21 i want to get answer 132, fmod does it, but why my implementation cannot get the correct answer? 回答1: The problem, as addressed by Ivan, is that you

问题 In the program below, I am trying to calculate the distance between two points. For this, I have made two Point objects. In the method that returns the distance, I have used the distance formula to calculate distance between two points in space. However, every time I run the program, I get a not a number value, which shouldn't be there. Please help. #include <iostream> #include <cstdlib> #include <cstdio> #include <cmath> using namespace std; class Point { public: Point(int a, int b); ~Point(

问题 I am writing a program in which I need to store numbers with a very high precision(around 10^-10 ) and then further use them a parameter( create_bloomfilter ([yet to decide the type] falsePositivity, long expected_num_of_elem) ). The highest precision I am able to get is with double (something around 10^-6 ) which is not sufficient. How can we store numbers with more higher precision in c? 回答1: You have been misinformed about double . The smallest positive number you can store in a double is