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Get Coefficient

0 likes • Nov 18, 2022 • 4 views
C++
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More C++ Posts

C++ SigFigs

0 likes • Sep 7, 2022 • 0 views
C++
#include <iostream>
#include <cstring>
int main(int argc, char** argv){
//With decimal
if(strstr(argv[1], ".") != nullptr){
int i = 0;
//Skip i to first non 0 digit
while(argv[1][i] < '1' || argv[1][i] > '9') ++i;
//If digit comes before decimal
if((argv[1] + i) < strstr(argv[1], ".")){ //Good example of pointer arithmetic
std::cout << strlen(argv[1] + i) - 1 << std::endl; //Another good example
}else{
//If digit is after decimal
std::cout << strlen(argv[1] + i) << std::endl;
}
}else{
//Without decimal
int m = 0;
int i = 0;
while(argv[1][i] < '1' || argv[1][i] > '9') ++i; //In case of some number like 0045
for(; argv[1][i] != '\0'; ++i){
if(argv[1][i] >= '1' && argv[1][i] <= '9') m = i + 1;
}
std::cout << m << std::endl;
}
return 0;
}

BFS/DFS/TopSort

0 likes • Apr 30, 2021 • 3 views
C++
#include <bits/stdc++.h>
#define MAXSIZE 50000
#define INF 100000
using namespace std;
vector<int> adj[MAXSIZE]; //Adjacency List
bool visited[MAXSIZE]; //Checks if a node is visited or not in BFS and DFS
bool isConnected = true; //Checks if the input graph is connected or not
int dist[MAXSIZE], discover[MAXSIZE], finish[MAXSIZE]; //Distance for BFS, in time and out time for DFS
int t = 1; //Time used for DFS
int u, v, i, j, k, N = 0;
stack<int> st; //Stack for TopSort
multiset<pair<int, int>> s; //collection of pairs to sort by distance
pair<int, int> current; //pointer variable to a position in the multiset
void BFS()
{
queue<int> q; //queue for BFS
q.push(1); //pushing the source
dist[1] = 0; //assign the distance of source as 0
visited[1] = 1; //marking as visited
while(!q.empty())
{
u = q.front();
q.pop();
for(i=0; i < adj[u].size(); i++)
{
v = adj[u][i]; //Adjacent vertex
if(!visited[v]) //if not visited, update the distance and push onto queue
{
visited[v] = 1;
dist[v] = dist[u]+1;
q.push(v);
}
}
}
for(i = 1; i <= N; i++)
{
s.insert(make_pair(dist[i], i)); //for sorted distance
}
cout << "BFS results:" << endl;
//prints BFS results and checks if the graph is connected
while(!s.empty())
{
current = *s.begin();
s.erase(s.begin());
i = current.second;
j = current.first;
if(j == INF) //if any infinite value, graph is not connected
{
cout << i << " INF" << endl;
isConnected = false;
}
else
{
cout << i << " " << j << endl;
}
}
//marks blocks of memory as visited
memset(visited, 0, sizeof visited);
}
void dfsSearch(int s)
{
visited[s] = 1; //marking it visited
discover[s] = t++; //assigning and incrementing time
int i, v;
for(i = 0; i < adj[s].size(); i++)
{
v = adj[s][i];
if(!visited[v]) //if vertex is not visited then visit, else continue
{
dfsSearch(v);
}
}
st.push(s); //pushed onto stack for TopSort if it was called
finish[s] = t++; //out time
}
void DFS()
{
for(i = 1; i <= N; i++)
{
if(visited[i]) //if visited continue, else visit it with DFS
{
continue;
}
dfsSearch(i); //embedded function to actually perform DFS
}
for(i=1;i<=N;i++)
{
s.insert(make_pair(discover[i], i)); //minheap for sorted discovery time
}
cout << "DFS results:" << endl;
while(!s.empty()) //Prints DFS results as long as the multiset is not empty
{
current = *s.begin(); //duplicates the pointer to first object in the multiset
s.erase(s.begin()); //erases the first object in multiset
i = current.second;
cout << i << " " << discover[i] << " " << finish[i] << endl; //prints discover times and finish times
}
}
void TopSort()
{
//call DFS so we can have a sorted stack to print
for(i=1;i<=N;i++)
{
if(visited[i])
{
continue;
}
dfsSearch(i);
}
cout<<"Topological Sort results:"<<endl;
//print sorted results from DFS
while(!st.empty())
{
i = st.top();
st.pop();
cout << i << endl;
}
//declare blocks of memory as visited
memset(visited, 0, sizeof visited);
}
int main()
{
string str, num, input;
int selection, connectedChoice = 0;
//get to input any file, more freedom than declaring file in command line
cout << "Enter the exact name of your input file [case sensitive]: ";
cin >> input;
ifstream inputFile(input); //Read the input file
//checks if the ifstream cannot open
if(inputFile.fail())
{
cout << endl << "No input files matching that name. Terminating..." << endl;
return 0;
}
//Read until the end of file
while(!inputFile.eof())
{
getline(inputFile, str); //read the current line
if(str == "")
{
continue;
}
if(!isdigit(str[0])) //checks to see if the first item in a line is a digit or not
{
cout << "Invalid file format. You have a line beginning with a non-digit. Terminating..." << endl;
return 0;
}
stringstream ss;
ss << str; //convert the line to stream of strings
ss >> num; //read the line num
stringstream(num) >> u;
while(!ss.eof())
{
ss>>num;
if(stringstream(num) >> v)
{
adj[u].push_back(v); //read the adjacent vertices
}
}
N++; //calculate the number of vertices
sort(adj[u].begin(), adj[u].end()); //sort the adjacency list in case it is not sorted
}
//creates arbitrary values for distance, will check later if INF remain
for(i = 1; i <= N; i++)
{
dist[i] = INF;
}
cout << endl << "Valid Input file loaded!" << endl;
while(selection != 4)
{
cout << "************************************************" << endl;
cout << "What type of analysis would you like to perform?" << endl;
cout << "1: Breadth-First Search" << endl;
cout << "2: Depth-First Search" << endl;
cout << "3: Topological Sort" << endl;
cout << "4: Quit" << endl;
cout << "************************************************" << endl;
//read user input and execute selection
cin >> selection;
switch(selection)
{
case 1:
cout << endl;
BFS();
cout << endl;
cout << "Would you like to know if the graph is connected?" << endl;
cout << "1: Yes" << endl;
cout << "Any other key: No" << endl;
cin >> connectedChoice;
switch(connectedChoice)
{
case 1:
if(!isConnected)
{
cout << "The graph is not connected." << endl << endl;
}
else
{
cout << "The graph is connected!" << endl << endl;
}
break;
default:
break;
}
break;
case 2:
cout << endl;
DFS();
cout << endl;
break;
case 3:
cout << endl;
TopSort();
cout << endl;
break;
case 4:
return 0;
default:
cout << endl << "Invalid selection." << endl; //loops the selection prompt until a valid selection is input.
}
}
}

GCD using Stein's Algorithm

0 likes • Jun 30, 2023 • 1 view
C++
// Iterative C++ program to
// implement Stein's Algorithm
//#include <bits/stdc++.h>
#include <bitset>
using namespace std;
// Function to implement
// Stein's Algorithm
int gcd(int a, int b)
{
/* GCD(0, b) == b; GCD(a, 0) == a,
GCD(0, 0) == 0 */
if (a == 0)
return b;
if (b == 0)
return a;
/*Finding K, where K is the
greatest power of 2
that divides both a and b. */
int k;
for (k = 0; ((a | b) & 1) == 0; ++k)
{
a >>= 1;
b >>= 1;
}
/* Dividing a by 2 until a becomes odd */
while ((a & 1) == 0)
a >>= 1;
/* From here on, 'a' is always odd. */
do
{
/* If b is even, remove all factor of 2 in b */
while ((b & 1) == 0)
b >>= 1;
/* Now a and b are both odd.
Swap if necessary so a <= b,
then set b = b - a (which is even).*/
if (a > b)
swap(a, b); // Swap u and v.
b = (b - a);
} while (b != 0);
/* restore common factors of 2 */
return a << k;
}
// Driver code
int main()
{
int a = 12, b = 780;
printf("Gcd of given numbers is %d\n", gcd(a, b));
return 0;
}

Simple Greedy sort C++

0 likes • Jun 30, 2023 • 5 views
C++
#include <iostream>
using namespace std;
int main()
{
int arr[] = {5, 1, 4, 20, 10, 2, 13, 11, 6, 21};
int greed[] = {0, 0, 0, 0};
int k = 0;
int i;
int set_index;
while (k < 4)
{
i = 0;
while (i < 10)
{
if (arr[i] > greed[k])
{
greed[k] = arr[i];
set_index = i;
}
i++;
}
arr[set_index] = 0;
k++;
}
cout << greed[0] << " " << greed[1] << " " << greed[2] << " " << greed[3] << endl;
}

Compute Volume of Cylinder

0 likes • Nov 18, 2022 • 0 views
C++
/*
Algorithm:
Step 1: Get radius of the cylinder from the user and store in variable r
Step 2: Get height of the cylinder from the user and store in variable h
Step 3: Multiply radius * radius * height * pi and store in v
Step 4: Display the volume
*/
#include <iostream>
using namespace std;
int main()
{
float r; //define variable for radius
float h; //define variable for height
float v;
float pi;
pi=3.1416;
cout<<"Enter radius:";
cin>>r;
cout<<"Enter height:";
cin>>h;
v=r*r*h*pi; //compute volume
cout<<"Radius:"<<r<<"\tHeight:"<<h<<endl; //display radius and height
cout<<"\n************************\n";
cout<<"Volume:"<<v<<endl;//display volume
return 0;
}

wordScore.cpp

0 likes • Apr 16, 2023 • 0 views
C++
#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 only
int 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 score
int 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 value
if(wordValue == sum){
std::cout << line << std::endl;
}
} else {
std::cout << sum << "\t" << line << std::endl;
}
}
return 0;
}