Notes week of Oct 27

hasdigit.cpp

#include <iostream>
#include <cctype>
using namespace std;

int main() {
   bool hasDigit   = false;
   string passCode = "";
   int valid       = 0;

   passCode = "abc";

   hasDigit = isdigit(passCode.at(0))
       || isdigit(passCode.at(1))
       || isdigit(passCode.at(2));

   if (hasDigit) {
      cout << "Has a digit." << endl;
   }
   else {
      cout << "Has no digit." << endl;
   }

   return 0;
}

spaces.cpp

#include <iostream>
#include <string>
#include <cctype>
using namespace std;

int main() {
   string passCode = "";
   cout << "Enter pass code: ";
   getline(cin, passCode);
   //passCode = "1 "; // Replace spaces with _
   int i = 0;
   while(i < passCode.size()) {
       if(isspace(passCode.at(i))) {
           passCode.at(i) = '_';
       }
       i++;
   }

   cout << passCode << endl;
   return 0;
}

climatebars.cpp

// climate bar graph

#include <iostream>
using namespace std;
int main()
{
    cout << "Enter temperature: ";
    int temp;
    cin >> temp;
    int num_stars = 0;
    while(num_stars < temp) {
        //cout << num_stars;
        cout << "*" << endl;
        num_stars += 5;
    }
    cout << endl;

    return 0;
}

climatebars-for.cpp

// climate bar graph

#include <iostream>
using namespace std;
int main()
{
    cout << "Enter temperature: ";
    int temp;
    cin >> temp;
    for(int num_stars = 0; num_stars < temp; num_stars += 5)
    {
        //cout << num_stars;
        cout << "*" << endl;
    }
    cout << endl;

    return 0;
}

double-loop.cpp

// climate bar graph

#include <iostream>
using namespace std;
int main()
{
    cout << "Enter size: ";
    int size;
    cin >> size;
    for(int i = 1; i <= size; i++)
    {
        for(int j = 1; j <= size; j++)
        {
            if((i*j)%2 == 0) {
                cout << "*";
            }
            else {
                cout << " ";
            }
        }
        cout << endl;
    }

    return 0;
}