Output not displaying correctly for some "if else" statements calculating BMI (body weight category)

[Tate]

Hello,

My C++ program is compiling correctly and providing the correct output for the first two computations (Test Cases #1 & #2), but in computations 3 and 4 (Test Cases #3 & #4), the output is showing the output for Test Case #2 (normal). Perhaps I need another variable?

The instructions read, "Write a program that asks for the height and weight of a person. Calculate and display this person’s BMI. Determine and display this person’s body weight category. The weight is measured in pounds and the height is in inches. BMI = 703 * weight / (height * height). If the "BMI Range" is under 18.5, you are underweight; 18.5 to under 25, your weight is normal; 25 to under 30, you are overweight; and 30 or above, you are obese. Perhaps I need to declare another variable?

The Test cases are as follows:

Test Case #1:

INPUT
height: 70
weight: 110

EXPECTED OUTPUT
BMI: 15.7816
body weight category: underweight


Test Case #2:

INPUT
height: 64
weight: 140

EXPECTED OUTPUT
BMI: 24.0283
body weight category: normal


Test Case #3:

INPUT
height: 66
weight: 170

EXPECTED OUTPUT
BMI: 27.4357
body weight category: overweight


Test Case #4:

INPUT
height: 62
weight: 210

EXPECTED OUTPUT
BMI = 38.4053
body weight category: obese


Here's my code:

#include<iostream>

using namespace std;

int main ()
{
double height = 0.0;
double weight = 0.0;
double bmi = 0.0;

cout << "Enter your height (in inches): ";
cin >> height;

cout << "Enter your weight (in pounds): ";
cin >> weight;
bmi = 703 * weight / (height * height);

if (bmi < 18.5)
{
cout << "Your body weight category is underweight." << endl;
}
else if (bmi = 18.5 < 25)
{
cout << "Your body weight category is normal." << endl;
}
else if (bmi = 25 < 30)
{
cout << "Your body weight category is overweight." << endl;
}
else if (bmi >= 30)
{
cout << "Your body weight category is obese." << endl;
}

system ("pause");
return 0;
}


Any help would be greatly appreciated...

THANKS!

[vlad from moscow]

Change the statements

else if (bmi = 18.5 < 25)
...
else if (bmi = 25 < 30)
...

to

else if (bmi < 25)
...
else if (bmi < 30)
...

[Tate]

Hey Vlad,

I changed the code per your input, but when I enter the Test Case #3 and Test Case #4 data, the output still reads, "Your body weight category is normal." Hmm...

Tate

[vlad from moscow]

Show the updated code.

[Tate]

#include<iostream>

using namespace std;

int main ()
{
double height = 0.0;
double weight = 0.0;
double bmi = 0.0;

cout << "Enter your height (in inches): ";
cin >> height;

cout << "Enter your weight (in pounds): ";
cin >> weight;
bmi = 703 * weight / (height * height);

if (bmi < 18.5)
{
cout << "Your body weight category is underweight." << endl;
}
else if (bmi = 18.5 < 25)
{
cout << "Your body weight category is normal." << endl;
}
else if (bmi < 25)
{
cout << "Your body weight category is overweight." << endl;
}
else if (bmi < 30)
{
cout << "Your body weight category is obese." << endl;
}

system ("pause");
return 0;
}

[Tate]

Problem too is that the BMI range needs to be 25 to under 30 for "overweight," and the BMI range needs to be 30 or above for "obese."

[vlad from moscow]

You did not update the code as I showed. Shall be

if (bmi < 18.5)
{
cout << "Your body weight category is underweight." << endl;
}
else if (bmi < 25)
{
cout << "Your body weight category is normal." << endl;
}
else if (bmi < 30)
{
cout << "Your body weight category is overweight." << endl;
}
else
{
cout << "Your body weight category is obese." << endl;
}

[Tate]

Oh, I see! Guess I was over-thinking the problem.... Thank you!