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#include <iostream>using namespace std;/* Function: get_coeffParameters: double& coeff, int pos passed from bb_4acReturn: type is void so no return, but does ask for user to input data that establishes what a b and c are.*/void get_coeff(double& coeff, int pos) {char position;if(pos == 1) {position = 'a';} else if(pos == 2) { //a simple system to determine what coefficient the program is asking for.position = 'b';} else {position = 'c';}cout << "Enter the co-efficient " << position << ":"; //prompt to input coeffcoeff = 5; //input coeff}/* Function: bb_4acParameters: no parameters passed from main, but 3 params established in function, double a, b, c.Return: b * b - 4 * a * c*/double bb_4ac() {double a, b, c; //coefficients of a quadratic equationget_coeff(a, 1); // call function 1st timeget_coeff(b, 2); // call function 2nd timeget_coeff(c, 3); // call function 3rd timereturn b * b - 4 * a * c; //return b * b - 4 * a * c}int main() {cout << "Function to calculate the discriminant of the equation. . . " << endl;double determinate = bb_4ac(); //assign double determinate to bb_4ac functioncout << "The discriminant for given values is: " << determinate << endl; //output the determinate!}
using namespace std;class Hash{int BUCKET; // No. of buckets// Pointer to an array containing bucketslist<int> *table;public:Hash(int V); // Constructor// inserts a key into hash tablevoid insertItem(int x);// deletes a key from hash tablevoid deleteItem(int key);// hash function to map values to keyint hashFunction(int x) {return (x % BUCKET);}void displayHash();};Hash::Hash(int b){this->BUCKET = b;table = new list<int>[BUCKET];}void Hash::insertItem(int key){int index = hashFunction(key);table[index].push_back(key);}void Hash::deleteItem(int key){// get the hash index of keyint index = hashFunction(key);// find the key in (inex)th listlist <int> :: iterator i;for (i = table[index].begin();i != table[index].end(); i++) {if (*i == key)break;}// if key is found in hash table, remove itif (i != table[index].end())table[index].erase(i);}// function to display hash tablevoid Hash::displayHash() {for (int i = 0; i < BUCKET; i++) {cout << i;for (auto x : table[i])cout << " --> " << x;cout << endl;}}// Driver programint main(){// array that contains keys to be mappedint a[] = {15, 11, 27, 8, 12};int n = sizeof(a)/sizeof(a[0]);// insert the keys into the hash tableHash h(7); // 7 is count of buckets in// hash tablefor (int i = 0; i < n; i++)h.insertItem(a[i]);// delete 12 from hash tableh.deleteItem(12);// display the Hash tableh.displayHash();return 0;}
#include <iostream>#include <string> //Should already be in iostream#include <cstdlib>//A word score adds up the character values. a-z gets mapped to 1-26 for the values of the characters.//wordScore [wordValue]//Pipe in the input into stdin, or type the words yourself.//Lowercase words onlyint characterValue(const char b){return ((b >= 'a') && (b <= 'z'))? ((b - 'a') + 1) : 0;}int main(int argc, char** argv){//The first argument specifies if you are trying to look for a certain word scoreint wordValue = (argc > 1)? std::atoi(argv[1]) : 0;std::string line;while(std::getline(std::cin, line)){int sum = 0;for(const char c : line){sum += characterValue(c);}if(wordValue){ //If wordValue is 0 or the sum is the correct valueif(wordValue == sum){std::cout << line << std::endl;}} else {std::cout << sum << "\t" << line << std::endl;}}return 0;}
#include <iostream>int main(){const char* const hello = "Hello, world!";const char* bruh = hello;char* const yeet = hello;std::cout << bruh << std::endl;std::cout << yeet << std::endl;return 0;}/*Place your bets!Will the program:a.) Print "Hello, world!" twice?b.) Compile error on line 5 (bruh initialize line) because the pointer gets implicit cast to non-const?c.) Compile error on line 7 (yeet initialize line) because the char gets implicit cast to non-const?d.) Both b and c?e.) Compile error line 11 (print yeet) because the pointer is constant and can't be incrementedf.) Print "Hello, world!" then print the pointer address in hexadecimalg.) Both b and e?h.) Both c and e?i.) B, c, and e?*/// The answer is in this base 64 string:// 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
//From https://create.arduino.cc/projecthub/abhilashpatel121/easyfft-fast-fourier-transform-fft-for-arduino-9d2677#include <cmath>#include <iostream>const unsigned char sine_data[] = { //Quarter a sine wave0,4, 9, 13, 18, 22, 27, 31, 35, 40, 44,49, 53, 57, 62, 66, 70, 75, 79, 83, 87,91, 96, 100, 104, 108, 112, 116, 120, 124, 127,131, 135, 139, 143, 146, 150, 153, 157, 160, 164,167, 171, 174, 177, 180, 183, 186, 189, 192, 195, //Paste this at top of program198, 201, 204, 206, 209, 211, 214, 216, 219, 221,223, 225, 227, 229, 231, 233, 235, 236, 238, 240,241, 243, 244, 245, 246, 247, 248, 249, 250, 251,252, 253, 253, 254, 254, 254, 255, 255, 255, 255};float sine(int i){ //Inefficient sineint j=i;float out;while(j < 0) j = j + 360;while(j > 360) j = j - 360;if(j > -1 && j < 91) out = sine_data[j];else if(j > 90 && j < 181) out = sine_data[180 - j];else if(j > 180 && j < 271) out = -sine_data[j - 180];else if(j > 270 && j < 361) out = -sine_data[360 - j];return (out / 255);}float cosine(int i){ //Inefficient cosineint j = i;float out;while(j < 0) j = j + 360;while(j > 360) j = j - 360;if(j > -1 && j < 91) out = sine_data[90 - j];else if(j > 90 && j < 181) out = -sine_data[j - 90];else if(j > 180 && j < 271) out = -sine_data[270 - j];else if(j > 270 && j < 361) out = sine_data[j - 270];return (out / 255);}//Example data://-----------------------------FFT Function----------------------------------------------//float* FFT(int in[],unsigned int N,float Frequency){ //Result is highest frequencies in order of loudness. Needs to be deleted./*Code to perform FFT on arduino,setup:paste sine_data [91] at top of program [global variable], paste FFT function at end of programTerm:1. in[] : Data array,2. N : Number of sample (recommended sample size 2,4,8,16,32,64,128...)3. Frequency: sampling frequency required as input (Hz)If sample size is not in power of 2 it will be clipped to lower side of number.i.e, for 150 number of samples, code will consider first 128 sample, remaining sample will be omitted.For Arduino nano, FFT of more than 128 sample not possible due to mamory limitation (64 recomended)For higher Number of sample may arise Mamory related issue,Code by ABHILASHContact: [email protected]Documentation:https://www.instructables.com/member/abhilash_patel/instructables/2/3/2021: change data type of N from float to int for >=256 samples*/unsigned int sampleRates[13]={1,2,4,8,16,32,64,128,256,512,1024,2048};int a = N;int o;for(int i=0;i<12;i++){ //Snapping N to a sample rate in sampleRatesif(sampleRates[i]<=a){o = i;}}int in_ps[sampleRates[o]] = {}; //input for sequencingfloat out_r[sampleRates[o]] = {}; //real part of transformfloat out_im[sampleRates[o]] = {}; //imaginory part of transformint x = 0;int c1;int f;for(int b=0;b<o;b++){ // bit reversalc1 = sampleRates[b];f = sampleRates[o] / (c1 + c1);for(int j = 0;j < c1;j++){x = x + 1;in_ps[x]=in_ps[j]+f;}}for(int i=0;i<sampleRates[o];i++){ // update input array as per bit reverse orderif(in_ps[i]<a){out_r[i]=in[in_ps[i]];}if(in_ps[i]>a){out_r[i]=in[in_ps[i]-a];}}int i10,i11,n1;float e,c,s,tr,ti;for(int i=0;i<o;i++){ //ffti10 = sampleRates[i]; // overall values of sine/cosine :i11 = sampleRates[o] / sampleRates[i+1]; // loop with similar sine cosine:e = 360 / sampleRates[i+1];e = 0 - e;n1 = 0;for(int j=0;j<i10;j++){c=cosine(e*j);s=sine(e*j);n1=j;for(int k=0;k<i11;k++){tr = c*out_r[i10 + n1]-s*out_im[i10 + n1];ti = s*out_r[i10 + n1]+c*out_im[i10 + n1];out_r[n1 + i10] = out_r[n1]-tr;out_r[n1] = out_r[n1]+tr;out_im[n1 + i10] = out_im[n1]-ti;out_im[n1] = out_im[n1]+ti;n1 = n1+i10+i10;}}}/*for(int i=0;i<sampleRates[o];i++){std::cout << (out_r[i]);std::cout << ("\t"); // un comment to print RAW o/pstd::cout << (out_im[i]); std::cout << ("i");std::cout << std::endl;}*///---> here onward out_r contains amplitude and our_in conntains frequency (Hz)for(int i=0;i<sampleRates[o-1];i++){ // getting amplitude from compex numberout_r[i] = sqrt(out_r[i]*out_r[i]+out_im[i]*out_im[i]); // to increase the speed delete sqrtout_im[i] = i * Frequency / N;std::cout << (out_im[i]); std::cout << ("Hz");std::cout << ("\t"); // un comment to print freuency binstd::cout << (out_r[i]);std::cout << std::endl;}x = 0; // peak detectionfor(int i=1;i<sampleRates[o-1]-1;i++){if(out_r[i]>out_r[i-1] && out_r[i]>out_r[i+1]){in_ps[x] = i; //in_ps array used for storage of peak numberx = x + 1;}}s = 0;c = 0;for(int i=0;i<x;i++){ // re arraange as per magnitudefor(int j=c;j<x;j++){if(out_r[in_ps[i]]<out_r[in_ps[j]]){s=in_ps[i];in_ps[i]=in_ps[j];in_ps[j]=s;}}c=c+1;}float* f_peaks = new float[sampleRates[o]];for(int i=0;i<5;i++){ // updating f_peak array (global variable)with descending orderf_peaks[i]=out_im[in_ps[i]];}return f_peaks;}//------------------------------------------------------------------------------------////main.cppint data[64]={14, 30, 35, 34, 34, 40, 46, 45, 30, 4, -26, -48, -55, -49, -37,-28, -24, -22, -13, 6, 32, 55, 65, 57, 38, 17, 1, -6, -11, -19, -34,-51, -61, -56, -35, -7, 18, 32, 35, 34, 35, 41, 46, 43, 26, -2, -31, -50,-55, -47, -35, -27, -24, -21, -10, 11, 37, 58, 64, 55, 34, 13, -1, -7};int main(){const unsigned int SAMPLE_RATE = 48*1000; //48khzauto result = FFT(data,64,SAMPLE_RATE);std::cout << result[0] << " " << result[1] << " " << result[2] << " " << result[3] << std::endl;delete[] result;return 0;}
#include "goat.h" //include goat.hvoid Goat::setBreed(string breed) {this->breed = breed;}void Goat::setWeight(float weight) {this->weight = weight;}void Goat::setName(string name) {this->name = name;}void Goat::setGender(char gender) {this->gender = gender;}void Goat::setSpayed(bool goatIsSpayed) {this->goatIsSpayed = goatIsSpayed;}void Goat::setRegistrationID(string registrationID) {this->registrationID = registrationID;}void Goat::setColor(string color) {this->color = color;}void Goat::setOtherComments(string otherComments) {this->otherComments = otherComments;}string Goat::getBreed() {return breed;}float Goat::getWeight() {return weight;}string Goat::getName() {return name;}char Goat::getGender() {return gender;}bool Goat::getSpayed() {return goatIsSpayed;}string Goat::getRegistrationID() {return registrationID;}string Goat::getColor() {return color;}string Goat::getOtherComments() {return otherComments;}Goat::Goat() {breed = "";weight = 0.0;name = "";gender = '\0';goatIsSpayed = false;registrationID = "";color = "";otherComments = "";}Goat::Goat(string goatBreed, float goatWeight, string goatName, char goatGender, bool goatSpayedStatus, string goatRegistrationID, string goatColor, string goatOtherComments) {breed = goatBreed;weight = goatWeight;name = goatName;gender = goatGender;goatIsSpayed = goatSpayedStatus;registrationID = goatRegistrationID;color = goatColor;otherComments = goatOtherComments;}Goat::~Goat() {cout << "goat destroyed" << endl;}void Goat::printinfo() {cout << "Breed: " << breed << endl << "weight: " << weight << endl << "Name: " << name << endl << "Gender: " << gender << endl << "is Spayed: ";if(goatIsSpayed) { //here I do a logical test on boolean goatIsSpayed. if true cout << true else cout << falsecout << "True";} else {cout << "False";}cout << endl << "Registration ID: " << registrationID << endl << "Color Description: " << color << endl << "Other Comments: " << otherComments << endl << endl;}