Question

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

Answer 1

#include <stdio.h>
#include <stdbool.h>
 
// 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))  
            printf("%d ", i);  
    }  
}
 
 
 
 
/*
run:
 
2 6 12 20 30 42 56 72 90 

*/

 

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