Write the definition of a function absoluteValue, that receives an integer parameter

Write the definition of a function absoluteValue, that receives an integer parameter and returns the absolute value of the parameter's value. (You should write the logic for absolute value yourself... do not use the abs function of the C library.) So, if the parameter's value is 7 or 803 or 141 the function returns 7, 803 or 141 respectively. But if the parameter's value is -22 or -57, the function returns 22 or 57 (same magnitude but a positive instead of a negative). And if the parameter's value is 0, the function returns 0.