C++科学计算器代码 |21xrx.com

C++科学计算器代码

2023-07-14 21:39:45 深夜i -- --

C++ 科学计算器代码数值计算矩阵运算

C++是一种流行的编程语言，通常用于开发计算机程序。最近，一些程序员在使用C++编写计算器时，开始使用一些新的技术和功能来提高其性能和可靠性。下面，我们将分享一些C++科学计算器代码示例，包括以下功能：

1. 四则运算（加、减、乘、除）和取模运算

2. 单位转换（长度、体积、重量等）

3. 函数计算（sin、cos、tan、log等）

4. 统计计算（平均值、方差、标准差等）

以下是一个简单的C++科学计算器代码示例：


#include <iostream>
#include <math.h>
using namespace std;
int main() {
 
 double num1, num2;
 int operation;
 cout << "欢迎使用C++科学计算器！" << endl;
 cout << "请选择你要进行的操作：" << endl;
 cout << "1. 四则运算" << endl;
 cout << "2. 单位转换" << endl;
 cout << "3. 函数计算" << endl;
 cout << "4. 统计计算" << endl;
 cin >> operation;
 switch(operation) {
  case 1:
   cout << "请选择你要进行的运算：" << endl;
   cout << "1. 加法" << endl;
   cout << "2. 减法" << endl;
   cout << "3. 乘法" << endl;
   cout << "4. 除法" << endl;
   cout << "5. 取模" << endl;
   cin >> operation;
   cout << "请输入第一个数：";
   cin >> num1;
   cout << "请输入第二个数：";
   cin >> num2;
   switch(operation) {
    case 1:
     cout << "结果：" << num1 + num2 << endl;
     break;
    case 2:
     cout << "结果：" << num1 - num2 << endl;
     break;
    case 3:
     cout << "结果：" << num1 * num2 << endl;
     break;
    case 4:
     cout << "结果：" << num1 / num2 << endl;
     break;
    case 5:
     cout << "结果：" << fmod(num1, num2) << endl;
     break;
    default:
     cout << "错误的运算符！" << endl;
     break;
   }
   break;
  case 2:
   cout << "请选择你要转换的单位：" << endl;
   cout << "1. 长度" << endl;
   cout << "2. 体积" << endl;
   cout << "3. 重量" << endl;
   cin >> operation;
   cout << "请输入要转换的数值：";
   cin >> num1;
   switch(operation) {
    case 1:
     cout << "请选择转换前的单位：" << endl;
     cout << "1. 英尺" << endl;
     cout << "2. 英寸" << endl;
     cout << "3. 米" << endl;
     cin >> operation;
     switch(operation) {
      case 1:
       cout << num1 << "英尺 = " << num1 * 0.3048 << "米" << endl;
       break;
      case 2:
       cout << num1 << "英寸 = " << num1 * 0.0254 << "米" << endl;
       break;
      case 3:
       cout << num1 << "米 = " << num1 / 0.3048 << "英尺" << endl;
       break;
      default:
       cout << "错误的单位！" << endl;
       break;
     }
     break;
    case 2:
     cout << "请选择转换前的单位：" << endl;
     cout << "1. 立方英寸" << endl;
     cout << "2. 立方厘米" << endl;
     cout << "3. 升" << endl;
     cin >> operation;
     switch(operation) {
      case 1:
       cout << num1 << "立方英寸 = " << num1 * 0.016387 << "升" << endl;
       break;
      case 2:
       cout << num1 << "立方厘米 = " << num1 * 0.001 << "升" << endl;
       break;
      case 3:
       cout << num1 << "升 = " << num1 / 0.016387 << "立方英寸" << endl;
       break;
      default:
       cout << "错误的单位！" << endl;
       break;
     }
     break;
    case 3:
     cout << "请选择转换前的单位：" << endl;
     cout << "1. 盎司" << endl;
     cout << "2. 克" << endl;
     cout << "3. 毫克" << endl;
     cin >> operation;
     switch(operation) {
      case 1:
       cout << num1 << "盎司 = " << num1 * 28.35 << "克" << endl;
       break;
      case 2:
       cout << num1 << "克 = " << num1 / 28.35 << "盎司" << endl;
       break;
      case 3:
       cout << num1 << "毫克 = " << num1 / 1000 << "克" << endl;
       break;
      default:
       cout << "错误的单位！" << endl;
       break;
     }
     break;
    default:
     cout << "错误的操作！" << endl;
     break;
   }
   break;
  case 3:
   cout << "请选择要计算的函数：" << endl;
   cout << "1. sin" << endl;
   cout << "2. cos" << endl;
   cout << "3. tan" << endl;
   cout << "4. log" << endl;
   cin >> operation;
   cout << "请输入要计算的值：";
   cin >> num1;
   switch(operation) {
    case 1:
     cout << "sin(" << num1 << ") = " << sin(num1) << endl;
     break;
    case 2:
     cout << "cos(" << num1 << ") = " << cos(num1) << endl;
     break;
    case 3:
     cout << "tan(" << num1 << ") = " << tan(num1) << endl;
     break;
    case 4:
     cout << "log(" << num1 << ") = " << log(num1) << endl;
     break;
    default:
     cout << "错误的函数！" << endl;
     break;
   }
   break;
  case 4:
   cout << "请选择要计算的统计函数：" << endl;
   cout << "1. 平均数" << endl;
   cout << "2. 方差" << endl;
   cout << "3. 标准差" << endl;
   cin >> operation;
   if(operation == 1) {
    double sum = 0, count = 0, num;
    cout << "请输入要计算平均数的数量：";
    cin >> count;
    for(int i = 0; i < count; i++) {
     cout << "请输入第" << i + 1 << "个数：";
     cin >> num;
     sum += num;
    }
    cout << "平均数为：" << sum / count << endl;
   }
   else if(operation == 2) {
    double sum = 0, count = 0, num;
    cout << "请输入要计算方差的数量：";
    cin >> count;
    for(int i = 0; i < count; i++) {
     cout << "请输入第" << i + 1 << "个数：";
     cin >> num;
     sum += num;
    }
    double mean = sum / count;
    sum = 0;
    for(int i = 0; i < count; i++) {
     cout << "请输入第" << i + 1 << "个数：";
     cin >> num;
     sum += pow(num - mean, 2);
    }
    cout << "方差为：" << sum / count << endl;
   }
   else if(operation == 3) {
    double sum = 0, count = 0, num;
    cout << "请输入要计算标准差的数量：";
    cin >> count;
    for(int i = 0; i < count; i++) {
     cout << "请输入第" << i + 1 << "个数：";
     cin >> num;
     sum += num;
    }
    double mean = sum / count;
    sum = 0;
    for(int i = 0; i < count; i++) {
     cout << "请输入第" << i + 1 << "个数：";
     cin >> num;
     sum += pow(num - mean, 2);
    }
    cout << "标准差为：" << sqrt(sum / count) << endl;
   }
   else
    cout << "错误的操作！" << endl;
   
   break;
  default:
   cout << "错误的操作！" << endl;
   break;
 }
 return 0;
}

以上代码使用了一些流程控制语句（如`switch`和`if`），以及一些数学函数（如`fmod`、`sin`、`cos`、`tan`、`log`和`sqrt`）来支持一些高级功能，例如四则运算、单位转换、函数计算和统计计算。这个简单的代码示例展示了C++语言的灵活性和强大性能，因此是很多开发人员使用C++构建科学计算器的首选之一。

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