What is an ideal variable naming convention for loop variables? [closed]

Answer 1

My experience is that most people use single letters, e.g.: i, j, k, ... or x, y, or r, c (for row/column) or w, h (for width/height) , etc.

But I learned a great alternative a long time ago, and have used it ever since: double letter variables.

// recommended style              ●    // "typical" single-letter style
                                  ●
for (ii=0; ii<10; ++ii) {         ●    for (i=0; i<10; ++i) {
    for (jj=0; jj<10; ++jj) {     ●        for (j=0; j<10; ++j) {
        mm[ii][jj] = ii * jj;     ●             m[i][j] = i * j;
    }                             ●        }
}                                 ●    }

In case the benefit isn't immediately obvious: searching through code for any single letter will find many things that aren't what you're looking for. The letter i occurs quite often in code where it isn't the variable you're looking for.