strange for loop syntax in c++

General Tech Bugs & Fixes 2 years ago

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manpreet Tuteehub forum best answer Best Answer 2 years ago



I am reading counting sort algorithm on Geeksforgeeks. I have understood the algorithm but I am having a problem in the following for loop syntax. I have tried exactly the same syntax in cpp shell but it is not working.

for(int i=0; arr[i]; i++) {
 ++count[arr[i]];
 }

Here, arr[] is a char array and count[] is an integer array.

Please help me to understand this kind of for loop.

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manpreet 2 years ago

arr[i] evaluates to a character. If it is a null character then loop will terminate. You can think of it as

for(com/tag/int">int i=0; arr[i] != '\0'; i++) {}

In C++ any value other than 0 evaluates to true. '\0' is encoded as 0 and therefore arr[i] will evaluate to false when its value becomes '\0'.


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