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POJava Scanner keep asking for input until variable is a double or int, or empty, at which point is given default value
 

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  1. POJava Scanner keep asking for input until variable is a double or int, or empty, at which point is given default value
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    <p>here is the pseudo for what im asking</p> <pre><code>1. Take value 2. is value double or int? 3. if so, continue in program 4. else 5. is value empty? 6. if value empty; value=0.08 7. else 8. at this stage, value is not an empty valid, or a valid double or valid int 9. user did it wrong, prompt error 10. jump to step one take value </code></pre> <p>So to me this is pretty complicated, im new to this.</p> <p>Ive been trying to impliment it like so;</p> <pre><code>while ( costscan.hasNext() ) { double costperkm = costscan.nextDouble(); if (costperkm=double){ System.out.println("Value is double"); System.out.println("FUEL COST SAVED "); } else { if(costperkm=null){ costperkm=0.08; } else{ } System.out.println("FUEL COST SAVED "); } System.out.print("\n"); System.out.print("\n"); } </code></pre> <p>My code above is the result of just playing about so at this stage it may not even make sense anymore. Hope someone can help, thanks.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USKieronboz
    1. USKieronboz
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhat's the actual problem?
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      1. POJava Scanner keep asking for input until variable is a double or int, or empty, at which point is given default value
      1. USJustin Jasmann
    2. CODon't use a specific loop like that. Use a more generic like `while(costscan.hasNext())` and then use ifs for each of your conditions.
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      1. POJava Scanner keep asking for input until variable is a double or int, or empty, at which point is given default value
      1. USSotirios Delimanolis
    3. CO@JustinJasmann My musings of the idea don't work, I think I have implemented it wrong
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      1. POJava Scanner keep asking for input until variable is a double or int, or empty, at which point is given default value
      1. USKieronboz
 

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