C/ C++ Programming Practice Problem Question with Solution Loop If else

Loop If else condition C/ C++ Programming Practice Problem Question with Solution 

1. Write a program in c++ that swap two number without using any extra variable.   An example running session looks as follow:

Solution:

#include <iostream>

using namespace std;

int main() {

  int num1,num2;

  cout << "Enter Number 1 :";

  cin >> num1;

  cout << "Enter Number 2 :";

  cin >> num2;

  cout << "Before Swap Number is 1: "<<num1<<" & Number 2 is :"<<num2<<endl;

  num2=num1+num2;

  num1=num2-num1;

  num2=num2-num1;

  cout << "After Swap Number is 1: "<<num1<<" & Number 2 is :"<<num2;

  cin.get();

  return 0;

}

 

2.Write a program that input for students’ final grades in a given class (the grades are integer values in the range 1-9) after each time the program prompts "Do you want enter more Grade Y/N :" until user press N. The program then displays the class grade average, the highest grade, and how many students in the class failed the course (a grade less than 4 is a failing grade).. An example running session looks as follow:

Solution:

    #include <iostream>

using namespace std;

int main() {

int grade, count, highest, failed;

double sum, average; count = 0;

char choice;

sum = 0;

highest = 0;

failed = 0;

do{

  cout << "Enter student's grade:";

  cin >> grade;

  if( grade >=1 && grade <=9 )

  {

    sum = sum + grade;

    if ( grade > highest )

         highest = grade;

    if ( grade < 4 )

      ++failed;

    ++count;

  }

  else

     cout << "Invalid grade Input\n";

  cout << "Do you want enter more Grade Y/N :";

  cin >> choice;

}while ( choice=='Y'||choice=='y' );

average = sum / count; cout << endl;

cout << "Class average: " << average << endl;

cout << "Highest grade: " << highest << endl;

cout << "Number of students that failed the course: " << failed << endl;

cin.get();

return 0;

}

3. Write a program in c++ that prints a 'pyramid' shape of a specified height on the screen. Your height must be between 1 and 30

Solution:

#include <iostream>

using namespace std;

int main()

{

          int pyramid_height;

         

          cout << "How high would you like the pyramid?: ";

          cin >> pyramid_height;

          while (pyramid_height > 30 || pyramid_height < 1)

          {

                   cout << "Pick another height (must be between 1 and 30): ";

                   cin >> pyramid_height;

          }

         

    int line;

          cout <<endl;

          for (line = 1 ; line <= pyramid_height ; line++)

          {

                   int count;

                   int total_no_of_spaces =  pyramid_height - line;

                  

                   for (count = 1 ; count <= total_no_of_spaces ; count++)

                             cout << ' ';

                            

                   for (count = 1 ; count < line * 2 ; count++)

                             cout << '*';

                            

                   cout <<endl;

          }

          cin.get();

          return 0;

}

4. Write a program in c++  that read a number from user print its reverse number.

Solution:

#include <iostream>

using namespace std;

int main()

{

int n,sum=0,rem;

cout<<"Enter No:";

cin>>n;

cout<<"Orginal No:"<<n;

while(n>0)

{

    rem=n%10;

    sum=sum*10+rem;

    n /= 10;

}

cout<<"\nRevesed No:"<<sum;

cin.get();

return 0;

}

5. Write a program that print the following menu and get a user choice and execute the program.

*****Menu****

1.Swap Number

2.Grade

3.Pyramid

4.Reverse

Enter a User choice:

Hint: Use switch statement or for exit from program use “exit (1);” statement.

Solution:

#include <iostream>

using namespace std;

int main()

{

int choice;

do

{

cout<<"\n*****Menu****\n";

cout<<"1.Swap Number\n";

cout<<"2.Grade \n";

cout<<"3.Pyramid\n";

cout<<"4.Reverse\n";

cout<<"5.Exit\n";

cout<<"Enter a choice: ";

cin>>choice;

switch(choice)

{

  case 1:

         cout << "\n*******************************\n";

         int num1,num2;

         cout << "Enter Number 1 :";

         cin >> num1;

         cout << "Enter Number 2 :";

         cin >> num2;

         cout << "Before Swap Number is 1: "<<num1<<" & Number 2 is :"<<num2<<endl;

         num2=num1+num2;

         num1=num2-num1;

         num2=num2-num1;

         cout << "After Swap Number is 1: "<<num1<<" & Number 2 is :"<<num2;

         cout << "\n*******************************\n";

         break;

                    

  case 2:

         cout << "\n*******************************\n";

         //Grade program code here

         cout << "\n*******************************\n";

         break;           

             

  case 3:

         cout << "\n*******************************\n";

         //Pyramid program code here

         cout << "\n*******************************\n";

         break;

        

  case 4:

         cout << "\n*******************************\n";

         //Reverse program code here

         cout << "\n*******************************\n";

         break;

  case 5:

         exit(1);

       break;

  default:

          cout<<"Invalid Choice \n";                 

             

}

}while(true);

cin.get();

cin.get();

return 0;

}