Question

How to print all pronic numbers between 1 and 100 in Java

Answer 1

// A pronic number is a number which is the product of two consecutive integers
// 42 = 6 * 7 -> yes 6 and 7 is consecutive integers
// 45 = 5 * 9 -> no 5 and 9 is not consecutive integers
 
public class MyClass {
    static boolean isPronicNumber(int num) {  
        for (int i = 1; i <= num; i++) {  
            if ((i * (i + 1)) == num) {  
                return true;
            }  
        }  
        return false;  
    } 
    public static void main(String args[]) {
         for (int i = 1; i <= 100; i++) {  
            if (isPronicNumber(i))  
                System.out.print(i + " ");  
        }  
    }
}
 
 
 
 
/*
run:
   
2 6 12 20 30 42 56 72 90 
   
*/

 

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