How to calculate GCF and LCM of two numbers in Java? Example

This week's programming exercise is to write a Java program to calculate GCF and LCM of two numbers. The GCF stands for a Greatest common factor and LCM stands for Lowest common multiplier, both are popular mathematical operations and related to each other. The GCF is the largest number which divides both the number without leaving any remainder e.g. if two numbers are 24 and 40 then their GCF is 8 because 8 is the largest number which divides both 24 and 40 perfectly, without leaving any remainder. 

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Why use Underscore in Numbers from Java? Underscore in Numeric Literals Example

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