Or compile this with clang and -msse4.2 -O2 // https://codereview.stackexchange.com/questions/38182 // https://codereview.stackexchange.com/a/38184

Or compile this with clang and -msse4.2 -O2 // https://codereview.stackexchange.com/questions/38182 // https://codereview.stackexchange.com/a/38184 // Definition: Count number of 1's and 0's from integer with bitwise operation // 2^32 = 4,294,967,296 // unsigned int 32 bit #include<stdio.h> int CountOnesFromInteger(unsigned int); int main() { unsigned int inputValue; short unsigned int onesOfValue; printf("Please Enter value (between 0 to 4,294,967,295) : "); scanf("%u",&inputValue); onesOfValue = CountOnesFromInteger(inputValue); printf("\nThe Number has \"%d\" 1's and \"%d\" 0's",onesOfValue,32-onesOfValue); } // Notice the popcnt int CountOnesFromInteger(unsigned int value) { int count; for (count = 0; value != 0; count++, value &= value-1); return count; }