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C++ Fundamentals for Professionals

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Explore how default arguments in C++ functions allow you to call functions with fewer parameters by automatically using preset values. Understand how arguments are assigned from left to right and how providing specific arguments can override defaults. This lesson prepares you to write more flexible and readable code before moving on to function overloading.

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Default arguments #

C++
#include <iostream>
bool isTempOK(const int temp, const int low = 20, const int high = 50){
  return (low < temp) && (temp < high);
}
int main(){
  
  std::cout << std::boolalpha << std::endl;
  std::cout << "isTempOK(20): "  << isTempOK(20) <<  std::endl;
  std::cout << "isTempOK(30): "  << isTempOK(30) <<  std::endl;
  std::cout << "isTempOK(50): "  << isTempOK(50) <<  std::endl;
  std::cout <<  std::endl;
  
  std::cout << "isTempOK(30, 30): "  << isTempOK(30, 30) <<  std::endl;
  std::cout << "isTempOK(50, 30, 100): "  << isTempOK(50, 30, 100) <<  std::endl;
  
  std::cout << std::endl;
}

Explanation

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