math.h

问题 I searched the question similar to my problem Similar problem. But my problem is when using Turbo C compiler v3.0. Should I have to do some additional work for math.h file? please help. int main (void){ double result, a; clrscr(); printf("Enter a # for square root.\n"); scanf("%f",&a); printf("a = %f\n",a); result = sqrt(a); printf("a = %f and square root is %f\n",a, result); getch(); return 0; } The Output is like this: Enter a # for square root. 64 a = 0.000000 a = 0.000000 and square root

问题 I write a C code that have power function that is from math.h library. when I compiled my program, I received an error which is " undefined reference to 'pow' function ", I compile my program using gcc compiler (fedora 9). I insert -lm flag to gcc then, the error is omitted but the output of the pow function is 0. #include<math.h> main() { double a = 4, b = 2; b = pow(b,a); } Can anyone help me? Is there is a problem in my compiler?? Thanks. 回答1: Your program doesn't output anything. The 0

问题 This question already has answers here : Why pow(10,5) = 9,999 in C++ (8 answers) Closed 12 months ago . I wrote this code and first time of loop result is 99. Why is result 99, when it should be 100? #include <iostream> #include<math.h> using namespace std; int main () { int skt = 0; int sk[3]; int nsk = 3; sk[0]=1; sk[1]=2; sk[2]=8; for (int i=0; i<nsk; i++) { skt = skt + (sk[i]*pow(10.0,nsk-i-1)); cout <<" "<<skt<<endl; } } the result of this code 99 119 127 ,but if I use library cmath it

问题 Well, I think my problem is a little bit interesting and I want to understand what's happening in my Ubuntu box. I compiled and linked with gcc -lm -o useless useless.c the following useless piece of code: /*File useless.c*/ #include <stdio.h> #include <math.h> int main() { int sample = (int)(0.75 * 32768.0 * sin(2 * 3.14 * 440 * ((float) 1/44100))); return(0); } So far so good. But when I change to this: /*File useless.c*/ #include <stdio.h> #include <math.h> int main() { int freq = 440; int

问题 Do the C and C++ standards require the math operations in math.h on floating points (i.e. sqrt , exp , log , sin , ...) to return numerically best solution? For a given (exact and valid) input there can obviously in general not be an exact floating point output from these functions. But is the output required to be the representable value nearest to the mathematically exact one? If not, are there any requirements on precision whatsoever (possibly platform-specific / in other standards ?), so

问题 I am currently using gcc to compile and I need to use <math.h> . Problem is that it won't recognize the library. I have also tried -lm and nothing. The function I tried to use was ceil() and I get the following error: : undefined reference to `ceil' collect2: ld returned 1 exit status I am using the latest Ubuntu and math.h is there. I tried to use -lm in a different computer and it work perfectly. Does anyone know how to solve this problem? I did include <math.h> . Also, the command I used

问题 Some strange error appeared after I upgraded my Ubuntu from (10.11, 11.04 i dont know) to 11.10. I am getting an undefined reference to 'sqrt' while using math.h and linking with -lm I'm compiling with gcc -Wall -Werror -g -Iinclude/ -lm lib/matrix.c src/analyse.c -o bin/analyse.o both source-files use and include math.h. This code compiled without problems for and I didn't change much since the upgrade but now it won't work. Do you have any suggestions what I can do, to find the error? I'm

问题 I am just trying to calculate an amount for 10 years, using a relatively simple formula. I can input all of my variables, but I suspect I'm doing something wrong with the amount . #include <stdio.h> #include <math.h> int main(){ double amount; /* amount on deposit */ double principal; /* what's the principal */ double rate; /* annual interest rate */ int year; /* year placeholder and no. of total years */ int yearNo; printf("What is the principal? "); scanf("%d", &principal); printf("What is

问题 I am trying to use tgamma() from the standard library. When I try to compile, I get the error message: Call to undefined function tgamma I have the directive #include <cmath> . I use Embarcadero C++ Builder XE3, which claims to support C++11 standards. What could be my problem, and how to fix it? 回答1: Boost contains a tgamma function. #include <boost/math/special_functions/gamma.hpp> ... double rootPi = boost::math::tgamma<double>(0.5); Of course, you can always switch to a different compiler

问题 I'm trying to port some OpenGL ES code from windows to Android using the Android NDK. I'm using Visual Studio 2017 and C++. What I did so far, I created a cross platform gles project in VS and removed the ios data. I'm putting one code file after the other and try to fix any errors I can find. The issue I have is that is seems that math.h functions can't be found. Here's some information that might be relevant: Platform toolset is clang 3.8 Target API Level is android-21 Language standard is