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Thread: if else if elese if.... statement not working

  1. #1
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    Default if else if elese if.... statement not working

    I have the code below in a class, when I call the method e.g. patient1.monitorBloodPressure and if the blood pressure is set to for example 139 it will still read Blood Pressure level normal it will not go down the if else if ladder, am I blocking the code or have I written it in the wrong order?

    	public void monitorBloodPressure() {
    			if (bloodPressure<120)
    			{
    				System.out.println("Blood Pressure Level Normal");
    			}
    			else if (bloodPressure>=120||bloodPressure<=139)
    			{
    				System.out.println("HEALTH WARNING - High Blood Pressure - Prehypertension");
    			}
    			else if (bloodPressure>=140||bloodPressure<=159)
    			{
    				System.out.println("HEALTH WARNING - High Blood Pressure - Hypertension Stage 1");
    			}
    			else if (bloodPressure>=160||bloodPressure<=179)
    			{
    				System.out.println("HEALTH WARNING - High Blood Pressure - Hypertension Stage 2");
    			}
    			else if (bloodPressure>=180)
    			{
    				System.out.println("HEALTH WARNING - High Blood Pressure - Hypertensive Crisis - Emergency Care Needed");
    			}
    			else
    			{
    				System.out.println("Error");
    			}
    	}

    Thanks


  2. #2
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    Default Re: if else if elese if.... statement not working

    Nothing appears to be wrong. Print out the value of bloodPressure in the beginning of your method. I'd guess that you didn't set it correctly.
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    Default Re: if else if elese if.... statement not working

    Posting an SSCCE will illustrate your problem better. As is, my advice would be to print out the value of the variable 'bloodPressure' at the beginning of the method, then run the code to verify the value is what you expect.

    Edit: too slow, aussiemcgr beat me to it

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    Default Re: if else if elese if.... statement not working

    i tried putting:

    System.out.println(bloodPressure);

    this returns the correct value but it outputs HEALTH WARNING - High Blood Pressure - Prehypertension

    instead of going to:

    else if (bloodPressure>=180)
    			{
    				System.out.println("HEALTH WARNING - High Blood Pressure - Hypertensive Crisis - Emergency Care Needed");


    --- Update ---

    I fixed it it doesnt work with || (or) operators I changed them to && and it worked, but shouldn't it work with OR?

  5. #5
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    Default Re: if else if elese if.... statement not working

    Quote Originally Posted by ahans View Post
    I fixed it it doesnt work with || (or) operators I changed them to && and it worked, but shouldn't it work with OR?
    No. if-else statements will enter the first block which returns true. In the case of the OR operation, if the first condition is true, the second condition is not even checked. For AND operations, both conditions are always checked.
    So if you entered a blood pressure of 170 with your OR operations, this is what would happen:
    if(bloodPressure<120)? - No, next statement
    if(bloodPressure>=120)? - Yes, enter if block and print out statement
    If you did the same with AND operations instead of OR operations:
    if(bloodPressure<120)? - No, next statement
    if(bloodPressure>=120)? - Yes, continue evaluating
    	if(bloodPressure<=139)? - No, next statement
    if(bloodPressure>=140)? - Yes, continue evaluating
    	if(bloodPressure<=159)? - No, next statement
    if(bloodPressure>=160)? - Yes, continue evaluating
    	if(bloodPressure<=179)? - Yes, enter if block and print out statement
    NOTE TO NEW PEOPLE LOOKING FOR HELP ON FORUM:

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    3. Give us an example of what the output should look like when done correctly.

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