Question

Problem 16. Write a program to prompt the user for a floating point number x and compute the following formula: Problem 18. Write a program fragment that uses nested for loops to produce the following output, making sure that the user input is between 3 and 42.

Answer 1

Problem 16:

#include <iostream>
#include<math.h>
using namespace std;

int main( )

{

float x;
cout << "Input the value of x : ";
cin >> x;

float y = (x+sqrt(x*x-(2/x)))/(2*x);

cout << "Value of y : " << y << endl;

return 0;

}

Problem 18:

#include <iostream>
#include<math.h>
using namespace std;

int main( )

{

int rows;

while(true)
{
  
   cout << "Input the number of rows inbetween 3 and 42 : ";
   cin >> rows;
   if(rows>=3 && rows<=42)
       break;
   else
       continue;
}

for(int i=rows;i>=1;i--)
{
   for(int j=0;j<i;j++)
   {
       if(j==0 || j==i-1)
           cout << "*";
       else
           cout << " ";
   }
   cout << "\n";
}

return 0;

}