Question

How to print all pronic numbers between 1 and 100 in C++

Answer 1

#include <iostream>
 
// 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
  
bool isPronicNumber(int num) {  
    for (int i = 1; i <= num; i++) {  
        if ((i * (i + 1)) == num) {  
            return true;
        }  
    }  
    return false;  
}  
  
int main(void) {
    for (int i = 1; i <= 100; i++) {  
        if (isPronicNumber(i))  
            std::cout << i << " ";  
    }  
}
  
  
  
  
  
/*
run:
  
2 6 12 20 30 42 56 72 90 
  
*/

 

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