[交流] C++简单函数已有1人参与

#include <iostream>

double CalculateMinimum(double a, double b); //函数原型

int main(int argc, char* argv[])
{
    double x = 4.0, y = - 8.0;
    double minimum_value = CalculateMinimum(x, y); //调用函数

     std::cout << "The minimum of " << x << " and " << y << " is " << Minimum_value << "\n";

    return 0;
}
//以下语句为函数完成的任务
double CalculateMinimum(double a, double b)
{//函数里面不需要在声明a和b
      double Minimum;
      if (a < b)
      {
           minimum = a;
       }
  
      else
      {
            minimum = b;
       }

     return minimum;
}

#include <iostream>

void PrintPassOrFail (int score, int passMark);

int main(int argc, char* argv[])
{
     int score = 29, pass_mark = 30;
     PrintPassOrFail (score, pass_mark);

     return 0;
}

void PrintPassOrFail (int score, int passMark)
{
      if (score >= passMark)
      {
           std::cout << "Pass - Congratulations!\n";
       }
       else
       {
           std::cout << "Fail - better luck next time\n";
       }
}

#include <iostream>

void HasNoEffect (double x);

int main (int argc, char* argv[])
{
    double x =2.0;
    HasNoEffect (x);

     std::cout << x << "\n"; //输出结果为2.0

     return 0;
}

void HasNoEffect (double x)
{//x 值为2.0
     x += 1.0; //x值为3.0
}