I am having trouble using a boolean loop. I understand that they are true/false functions, however I when I run my program, it seems to always return the "true" value. Is main the one setting pass = true, or is it targetHR that set the value to true? I am stumped.
#include <iostream>
using namespace std;
bool targetHR(int, int);
int main()
{
int age = NULL, heartbeat;
while (age >= 0)
{
cout << "Enter your age: "; // Receives age from the user.
cin >> age;
if (age < 0)
{
break;
}
cout << "enter your heart beats per minute: "; // Receives heartbeat from user.
cin >> heartbeat;
bool pass = targetHR(age, heartbeat);
if (pass = true)
{
cout << "You are in your target heart rate." << endl;
}
if (pass = false)
{
cout << "You are not in your target heart rate." << endl;
}
cout << endl;
}
return 0;
}
My goal is to have targetHR be the one that does the calculations, as well as tell the main function if true/false. I want main to only have a response that is dependent on targetHR .
bool targetHR(int age, int heartbeat)
{
double maxHR, minTHR, maxTHR;
maxHR = 220 - age;
minTHR = maxHR * 0.60;
maxTHR = maxHR * 0.70;
// Debugging purposes.
// cout << "Max heartrate: " << maxHR << endl << "Min Target HR: " << minTHR << endl << "Max Target HR: " << maxTHR << endl;
if (heartbeat < minTHR || heartbeat > maxTHR)
{
return false;
}
else
{
return true;
}
}
I have tried solving the issue by changing true/false with 1/0, but that did not fix my problem, so I am assuming that is not the issue.
it seems to always return the "true" value
Because you're not using Comparison operator , you're using Assignment operator , which will return the value assigned for check, so pass = true
will always be true
, and pass = false
will always be false
. You should change
if (pass = true)
to
if (pass == true)
or just
if (pass)
BTW: Some compilers (such as clang ) will give warnings for it, don't ignore them.
warning: using the result of an assignment as a condition without parentheses
note: use '==' to turn this assignment into an equality comparison
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