#include <stdlib.h> #include <math.h> 10 + 20 // 30 20 - 10 // 10 10 * 20 // 200 20 / 10 // 2 // power require math.h pow(10, 2) // 100.00000 // floating point conversion 10.0 + (10 + 20) // 40.000000 // NOTE: char is promoted to int value 'c' + 10 // 109 (ascii value of c is 99) // floating point conversion using type casting (double) 10.0 + (10 + 20) // 40.000000 (double) 20.0 - (10 + 10) // 0.000000 (double) 10.0 * (10 * 2) // 200.000000 // common division error 30 / 20 // 1 (double) 30 / 20 // 1.500000 // integer divison, quotient 20 / 20 // 1 30 / 20 // 1 40 / 20 // 2 // modulo, remainder 10 % 20 // 10 // module, remainder on floating point fmod(12.5, 10.0) // 2.500000 // built-ins abs(-20) // 20 // rounding value round(2.945) // 3.000000 round(2.495) // 2.000000 // NOTE: no built-ins for round to decimal places // increment and decrement int a = 10; a++ // 11 a-- // 9