IFD:Acoustic Interfaces/introduction to c++: Difference between revisions

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Hey there, we were using this  [https://www.tutorialspoint.com/compile_cpp_online.php online compiler] to learn some basics about c++. Here are the code snippets we discussed:


Little intro to data types:


#include <iostream>
    #include <iostream>
#include <string>
    #include <string>
    using namespace std;
    int main()
    {
        int int_number = 2147483647; // 2^32 / 2 -1 = 2^31 -1 = 2147483648 -1 // -2^31 = -2147483648
        long long_integer = 9223372036854775807; // 2^64 / 2 - 1= 2^63 -1 = 2147483648 -1 // -2^63 = -2147483648
        float low_precision_big_float_number = 9223372036854775807; // 9.22337e+18 = 9.22337 *10^18
        double high_precision_big_float_number = 9223372036854775807; // 9.22337e+18 = 9.22337 *10^18
       
        //char are 8bit = 2^8 = 256
        char letter_exclamation = 33; // this gets converted through ASCII table to the letter '!'
        char letter_A = 65; // this gets converted through ASCII table to the letter '!'
       
        string text = "this is a string, it's not included by default";
       
        int converted_float = 3.21;
       
        cout << "Integer:  " << int_number << endl;
        cout << "Long Integer: " << long_integer  << endl;
        cout << "Overflow Integer:  " << int_number + 1 << endl;
        cout << "Overflow Long Integer: " << long_integer  +1 << endl;
        cout << "Low precision Big float: " << low_precision_big_float_number << endl;
        cout << "High precision Big float: " << high_precision_big_float_number << endl; // command line is the bottleneck of putting out more precision
        cout << "Thats the letter '!': " << letter_exclamation << endl;
        cout << "Thats the letter 'A': " << letter_A << endl;
        cout << text;
       
        return 0;
    }


using namespace std;
The code about classes and pointers:


int main()
    #include <iostream>
{
    using namespace std;
    int int_number = 2147483647; // 2^32 / 2 -1 = 2^31 -1 = 2147483648 -1 // -2^31 = -2147483648
    class Point2D {
    long long_integer = 9223372036854775807; // 2^64 / 2 - 1= 2^63 -1 = 2147483648 -1 // -2^63 = -2147483648
        public:
    float low_precision_big_float_number = 9223372036854775807; // 9.22337e+18 = 9.22337 *10^18
            Point2D(float newX, float newY){
     double high_precision_big_float_number = 9223372036854775807; // 9.22337e+18 = 9.22337 *10^18
                _x = newX;
                _y = newY;
            };
       
            float getX() {
              return _x; 
            };
           
            float getY() {
              return _y; 
            };
           
            void print() {
                cout << "(" << getX() << ", " << getY()<< ")" << endl;
            }
           
        private:
            float _x;
            float _y;
     };
      
      
     //char are 8bit = 2^8 = 256
     int main()
    char letter_exclamation = 33; // this gets converted through ASCII table to the letter '!'
    {
    char letter_A = 65; // this gets converted through ASCII table to the letter '!'
        Point2D point1(5,1);
   
        Point2D point2(10,100);
    string text = "this is a string, it's not included by default";
        Point2D point3(27,2);
   
       
    int converted_float = 3.21;
        point1.print();
   
        point2.print();
    cout << "Integer: " << int_number << endl;  
        // this is an array of integers
    cout << "Long Integer: " << long_integer  << endl;  
        int integerArray[5] = { 0,1,2,3,4 };
    cout << "Overflow Integer:  " << int_number + 1 << endl;  
       
    cout << "Overflow Long Integer: " << long_integer  +1 << endl;  
        cout << "first element: " << integerArray[0] << endl;
    cout << "Low precision Big float: " << low_precision_big_float_number << endl;
       
    cout << "High precision Big float: " << high_precision_big_float_number << endl; // command line is the bottleneck of putting out more precision
        // we can also declare an array points
    cout << "Thats the letter '!': " << letter_exclamation << endl;
        Point2D pointArray[3] = {point1, point2, point3 };
    cout << "Thats the letter 'A': " << letter_A << endl;  
        pointArray[2].print();
    cout << text;
       
   
        // pointer version of the code
    return 0;
        Point2D* p2d1_ptr = new Point2D(123, 234);
}
        Point2D* p2d2_ptr = new Point2D(123, 234);
        Point2D* p2d3_ptr = new Point2D(123, 234);
       
        (*p2d1_ptr).print();
       
        p2d1_ptr->print();
        Point2D* point_ptr_Array[3] = {p2d1_ptr, p2d2_ptr, p2d3_ptr };
        cout << "pointer address: " << point_ptr_Array[0] << "x component of the point at that address: " << point_ptr_Array[0]->getX()  << endl;
       
        return 0;
    }

Latest revision as of 10:39, 11 May 2020

Hey there, we were using this online compiler to learn some basics about c++. Here are the code snippets we discussed:

Little intro to data types:

   #include <iostream>
   #include <string>
   using namespace std;
   int main()
   {
       int int_number = 2147483647; // 2^32 / 2 -1 = 2^31 -1 = 2147483648 -1 // -2^31 = -2147483648
       long long_integer = 9223372036854775807; // 2^64 / 2 - 1= 2^63 -1 = 2147483648 -1 // -2^63 = -2147483648
       float low_precision_big_float_number = 9223372036854775807; // 9.22337e+18 = 9.22337 *10^18
       double high_precision_big_float_number = 9223372036854775807; // 9.22337e+18 = 9.22337 *10^18
       
       //char are 8bit = 2^8 = 256 
       char letter_exclamation = 33; // this gets converted through ASCII table to the letter '!'
       char letter_A = 65; // this gets converted through ASCII table to the letter '!'
       
       string text = "this is a string, it's not included by default";
       
       int converted_float = 3.21;
       
       cout << "Integer:  " << int_number << endl; 
       cout << "Long Integer: " << long_integer  << endl; 
       cout << "Overflow Integer:  " << int_number + 1 << endl; 
       cout << "Overflow Long Integer: " << long_integer  +1 << endl; 
       cout << "Low precision Big float: " << low_precision_big_float_number << endl;
       cout << "High precision Big float: " << high_precision_big_float_number << endl; // command line is the bottleneck of putting out more precision
       cout << "Thats the letter '!': " << letter_exclamation << endl; 
       cout << "Thats the letter 'A': " << letter_A << endl; 
       cout << text;
       
       return 0;
   }

The code about classes and pointers:

   #include <iostream>
   using namespace std;
   class Point2D {
       public:
           Point2D(float newX, float newY){
               _x = newX;
               _y = newY;
           };
       
           float getX() {
              return _x;  
           };
           
           float getY() {
              return _y;  
           };
           
           void print() {
               cout << "(" << getX() << ", " << getY()<< ")" << endl;
           }
           
       private:
           float _x;
           float _y;
   };
   
   int main()
   {
       Point2D point1(5,1);
       Point2D point2(10,100);
       Point2D point3(27,2);
       
       point1.print();
       point2.print();
       // this is an array of integers
       int integerArray[5] = { 0,1,2,3,4 };
       
       cout << "first element: " << integerArray[0] << endl;
       
       // we can also declare an array points
       Point2D pointArray[3] = {point1, point2, point3 };
       pointArray[2].print();
       
       // pointer version of the code
       Point2D* p2d1_ptr = new Point2D(123, 234);
       Point2D* p2d2_ptr = new Point2D(123, 234);
       Point2D* p2d3_ptr = new Point2D(123, 234);
       
       (*p2d1_ptr).print();
       
       p2d1_ptr->print();
       Point2D* point_ptr_Array[3] = {p2d1_ptr, p2d2_ptr, p2d3_ptr };
       cout << "pointer address: " << point_ptr_Array[0] << "x component of the point at that address: " << point_ptr_Array[0]->getX()  << endl;
       
       return 0;
   }