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Message: [QUOTE="flebber, post: 4393167"] Hi I am learning C. I am trying to sum an array with the values returned from a loop. Can I use the "?" operator as part of a loop; by experimentation I know I can't put the increment in the loop. doing ((i % 3 == 0)||(i % 5 == 0)) ? sum+=a[i] :i++ ; never actually finished, I think I created an infinite loop. PS I was following the example from here [URL]http://www.tutorialspoint.com/ansi_c/ternary_operator_examples.htm[/URL] So I have come to this this solution, I think the problem is that my array a[] is assigned as a one element array and since the first value returns false it gets 0 and exits. Is this right? If it is how do i assign an array to have an unknown number of entries? A kick in the right direction appreciated #include <stdio.h> int a[],i,sum=0; int main() { while(i < 1000) { ((i % 3 == 0)||(i % 5 == 0)) ? sum+=a[i] :0 ; i++; } printf("The sum is %d\n",sum); return 0; } Sayth[/i][/i] [/QUOTE]