There is a previous paper, n3499, which tell us that although Bjarne himself suggested spaces as separators: While this approach is consistent with one common typeographic style, it suffers from some compatibility problems. It does not match the syntax for a pp-number, and would minimally require extending that syntax. More importantly, there would be some … Read more
int value = 123; while (value > 0) { int digit = value % 10; // do something with digit value /= 10; }
C: Why not just take the base-10 log of the absolute value of the number, round it down, and add one? This works for positive and negative numbers that aren’t 0, and avoids having to use any string conversion functions. The log10, abs, and floor functions are provided by math.h. For example: int nDigits = … Read more
I am reading a text file and want to use regex below to pull out numbers with exactly 5 digit, ignoring alphabets. Try this… var str=”f 34 545 323 12345 54321 123456″, matches = str.match(/\b\d{5}\b/g); console.log(matches); // [“12345”, “54321”] jsFiddle. The word boundary \b is your friend here. Update My regex will get a number … Read more
Powers of 2: 2, 4, 8, 16, 32, 64, 128, 256… Last digits: 2, 4, 8, 6, 2, 4, 8, 6… Last digit of 2^i is: int arr[4] = {2, 4, 8, 6}; return arr[(i-1)%4];