integer-arithmetic – IT Nursery

Unexpected results when working with very big integers on interpreted languages

June 2, 2022 by IT Nursery

I am trying to get the sum of 1 + 2 + … + 1000000000, but I’m getting funny results in PHP and Node.js. PHP $sum = 0; for($i = 0; $i <= 1000000000 ; $i++) { $sum += $i; } printf(“%s”, number_format($sum, 0, “”, “”)); // 500000000067108992 Node.js var sum = 0; for (i … Read more

How can I add numbers in a Bash script?

April 28, 2022 by IT Nursery

I have this Bash script and I had a problem in line 16. How can I take the previous result of line 15 and add it to the variable in line 16? #!/bin/bash num=0 metab=0 for ((i=1; i<=2; i++)); do for j in `ls output-$i-*`; do echo “$j” metab=$(cat $j|grep EndBuffer|awk ‘{sum+=$2} END { print … Read more