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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;
}
C/ C++ Programming Practice Problem Question with Solution Loop If else
  • Title : C/ C++ Programming Practice Problem Question with Solution Loop If else
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  • Date : 12:03
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