Question

In C++

ab 8 DESCRIPTION: Complete all four problems. 1. Write a program that will accept two numbers from the user. The program should then evaluate the following equation, using the data input: 2-3X2 - 4Y?. Assume the second number input is Y. Now the program should test Z to see if Z is a negative number or a positive number (assume zero is included as a positive number). The program should output the values of X, Y, and Z and also output a message stating whether Z is negative or positive, Test this program using the following values: Run 1: X-2.4 Y-4.7 Run 2: X=12 Y-3 Run 3: X-02-0 1 Psych 2. Write a program that will calculate the safe load (S) on a load bearing column given the slimness ratio (R). The slimness ratio will be input by the user and the program should output the calculated safe load. The safe load is calculated as follows: S-17,000 - 485R2 for R 120 -DB ESS for R 2120 S 18.000 IR/18,000) S - not available for RO Where S-safe load (pounds per square inch) R-slimness ratio dimensionless it is a ratio of the column's length to its width). The program should output the R value and safe load or, if R is negative, a message saying that can't be negative, Execute this program three times using values of R - 20, R-1000, and R = -100.

Answer 1

//1st program

#include <iostream>
using namespace std;
int main() {
  float X,Y,Z;
  cout << "Enter value of X:";
  cin>>X; //user input for X
  cout << "Enter value of Y:";
  cin>>Y; //user input for Y

  Z = 3*(X*X) - 4*(Y*Y);  //computes Z
  //print X,Y and Z
  cout<<"X is:"<<X;
  cout<<"\nY is: "<<Y;
  cout<<"\nZ is: "<<Z;
  //check if z is positive or negative
  if(Z>=0)
  {
    cout<<"\n\nZ is positive";
  }
  else
  {
    cout<<"\n\nZ is negative";
  }
return 0;
}

Output::

Enter value of x:2.4 Enter value of Y:4.7 Y: X is:2.4 Y is: 4.7 2 is: -71.08 Z is negative>

Enter value of x:12 Enter value of Y:-3 X is:12 Y is: -3 z is: 396 Z is positive> 0

Enter value of x:0 Enter value of Y:0 X is:0 Y is: 0 Z is: 0 Z is positive> 0

#include <iostream>
using namespace std;
int main() {
  float R,S; //declared variable
  cout<<"Enter the slimness ratio(R): ";
  cin>>R; //user input for slimness ratio
  //if R is less than zero then show message
  if(R<0)
  {
    cout<<"R can't be negative";
  }
  else
  {
  //if R<120 compute S expression
  if(R<120)
  {
    S = 17000-485*(R*R);
  }
  //if R>=120 compute S expression
  else if(R>=120)
  {
    S = 18000/(1+((R*R)/18000));
  }
  //if R<0 then S is not available
  else if(R<0)
  {
    S = -1; //-1 represents not available
  }
  //print the output
  cout<<"For slimness ratio R = "<<R<<" the safe load is = "<<S;
  }
}

Output::

Enter the slimness ratio (R): 20 For slimness ratio R = 20 the safe load is -177000> 0

Enter the slimness ratio (R): 1000 For slimness ratio R = 1000 the safe load is = 318.2713 |

Enter the slimness ratio (R): -100 R can't be negative>

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