通过实践
了解和实践了VS2019平台上的基本操作：
打开VS2019、新建文件、打开文件、调试运行自动生成的代码、添加用户代码后调试运行等、……。新建、编写、调试、运行与测试。
制作一个带有标准IO（键盘输入与显示器输出）的C++程序语言与结构及其代码，……。这是一个框架-格式、模板、基础、扩充出发点。
在标准IO模板中添加一些基本的数学运算-四则混合运算、重复的连加连减连乘连除等。
由于是算术问题的计算机处理描述，问题的提法、算法分析、程序结构等问题比在此解说。通过阅读程序的基本功，相信初学者也可以读懂理解。当然，各个初始值的的设置，循环次数的设置等还是可以有多种变化的。读者可以自己去修改、理解程序描述的多样性。也可以找到用于一般性标准计算程序的设置与用户输入参数控制等。
下面先看一下从原来的程序扩充而来的代码：
自动生成的部分：
#include <iostream>
int main()
{
std::cout << "Hello World!
";
}
添加了标准IO的部分
#include <iostream>
int main()
{
//变量声明-获取内存空间—因为要为输入数据提供放置的地方
int Intdata1,add,multiply;
float RFdata1,subtract,divide;
//数据信息标准IO
std::cout << "Enter an integer :
";
std::cin >> Intdata1;
std::cout << "Hello World! data processing beginning:
";
//数据信息处理结果的标准输出
std::cout << " Keyboard input integer: "<< Intdata1 << "
";
std::cout << "The program is over!
";
}
扩充、添加了在标准IO模板中的数据处理部分
// VS2019Four_Mixed_Operations_C++IO.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include <iostream>
int main()
{
//变量声明-获取内存空间
int Intdata1, add, multiply, addS, multiplyS, finaleN;
float RFdata1, subtract, divide,subtractS, divideS, mixed;
//数据信息标准IO
std::cout << "Enter an integer :
";
std::cin >> Intdata1;
std::cout << "Enter an real :
";
std::cin >> RFdata1;
std::cout << "Hello World! data processing beginning:
";
//数据处理的描述-过程与行为
//Four mixed operations
add = Intdata1 + Intdata1;
multiply = 3 * Intdata1;
subtract = RFdata1 - Intdata1;
divide = RFdata1 / Intdata1;
mixed = add/ RFdata1 + Intdata1- subtract * multiply;
//Continuous addition, subtraction, multiplication, and division
std::cout << "Enter an integer: the mantissa of continuous addition
";
std::cin >> finaleN;
addS = 0;
for (size_t i = 0; i <= finaleN; i++)
{
addS = addS +i;
}
std::cout << "Enter an integer: the mantissa of continuous subtraction
";
std::cin >> finaleN;
subtractS = 100;
for (size_t i = 0; i <= finaleN; i++)
{
subtractS = subtractS-i;
}
std::cout << "Enter an integer: the mantissa of continuous multiplication
";
std::cin >> finaleN;
multiplyS= 1;
for (size_t i = 1; i <= finaleN; i++)
{
multiplyS = multiplyS * i;
}
std::cout << "Enter an integer: the mantissa of continuous division
";
std::cin >> finaleN;
divideS = 100;
for (size_t i = 1; i <= finaleN; i++)
{
divideS = divideS / i;
}
//数据信息处理结果的标准输出
std::cout << "
";
std::cout << "Adding two integers: " << add << "
";
std::cout << "3 multiply integers: " << multiply << "
";
std::cout << "Subtracting real numbers and integers: " << subtract << "
";
std::cout << "RFdata1 / Intdata1= " << divide << "
";
std::cout << " add/ RFdata1 + Intdata1- subtract * multiply= " << mixed << "
";
std::cout << "
";
std::cout << "The result of continuous addition: " << addS << "
";
std::cout << "The result of continuous subtraction: " << subtractS << "
";
std::cout << "The result of continuous multiplication: " << multiplyS << "
";
std::cout << "The result of continuous division: " << divideS << "
";
std::cout << "
";
std::cout << "The program is over!
";
}
// 运行程序: Ctrl + F5 或调试 >“开始执行(不调试)”菜单
// 调试程序: F5 或调试 >“开始调试”菜单
运行结果：
Enter an integer :
3
Enter an real :
4.4
Hello World! data processing beginning:
Enter an integer: the mantissa of continuous addition
5
Enter an integer: the mantissa of continuous subtraction
5
Enter an integer: the mantissa of continuous multiplication
5
Enter an integer: the mantissa of continuous division
5
Adding two integers: 6
3 multiply integers: 9
Subtracting real numbers and integers: 1.4
RFdata1 / Intdata1= 1.46667
add/ RFdata1 + Intdata1- subtract * multiply= -8.23636
The result of continuous addition: 15
The result of continuous subtraction: 85
The result of continuous multiplication: 120
The result of continuous division: 0.833333
The program is over!
程序与运行结果举报/反馈