mathlib.cpp

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#include "mathlib.h"
#include <cmath>
 
namespace mathlib {
 
double add(double a, double b) {
 
    return a + b;
}
 
double subtract(double a, double b) {
 
    return a - b;
}
 
double multiply(double a, double b) {
 
    return a * b;
}
 
double divide(double a, double b, MathError &err) {
 
    if(b == 0) {
        err = DIVISION_BY_ZERO;
        return 0;
    }
 
    err = OK;
    return a / b;
}
 
double factorial(int a, MathError &err) {
 
    if(a < 0 ) {
        err = NEGATIVE_FACTORIAL;
        return 0;
    }
 
    err = OK;
 
    double result = 1;
    for(int i = 1; i <= a; i++) {
        result = result * i;
    }
 
    return result;
}
 
double power(double base, int exp) {
 
    if(exp == 0) {
        return 1;
    }
 
    double result = 1;
 
    for(int i = 0; i < exp; i++) {
        result = result * base;
    }
 
    return result;
}
 
double root(double base, int n, MathError &err) {
 
    if(n == 0) {
        err = INVALID_ROOT;
        return 0;
    }
    if(n < 0) {
        err = INVALID_ROOT;
        return 0;
    }
    if(base < 0 && n % 2 == 0) {
        err = INVALID_ARGUMENT;
        return 0;
    }
    if(base < 0 && n % 2 != 0) {
        err = OK;
        return -std::pow(-base, 1.0 / n);
    }
 
    err = OK;
    return std::pow(base, 1.0 / n);
}
 
double modulo(double a, double b, MathError &err) {
 
    if(b == 0) {
        err = DIVISION_BY_ZERO;
        return 0;
    }
 
    err = OK;
 
    return std::fmod(a, b);
}
}