Question

#include <iostream>

using namespace std;

int num1, num2, num3, num4, num5, result, result1, result2, result3, value, cont;
//number user enters/variable
int main()
{
    cout << "please enter the operation,+ for addtion,- for subtaction,* for multiplatcion,/ for division"
    ;cin >> value
    ;cout << "please enter the first number number:";

    cin >> num1
    ;cout << "please enter the second number: ";
    cin >> num2

    ;if(value == '+' )
    ;result = num1 + num2;
    cout << num1 << " plus " << num2 << " is equal to: " << result << ".\n";
    if(value = '-' )
    ;result = num1 - num2;
    cout << num1 << " minus " << num2 << " is equal to: " << result << ".\n";
    if(value = '*' )
    ;result = num1 * num2;
    cout << num1 << " times " << num2 << " is equal to: " << result << ".\n";
    if(value = '/' )
    ;result = num1 / num2;
    cout << num1 << " divided by " << num2 << " is equal to: " << result << ".\n";



}
{
    cout << "press 1 to enter more numbers, or press 0 to not"
    cin >> cont
    if(cont = 1)
    cout << "please enter the operation,+ for addtion,- for subtaction,* for multiplatcion,/ for division"
    cin >> value1
    cout << "please enter the next number:";
    cin num3

    else(cont = 0)

    else(value1 = +)
    ;result1 = result + num3;
    cout << result << " plus " << num3 << " is equal to: " << result1 << ".\n";
    else(value1 = -)
    ;result1 = result - num3
    cout << result << " minus " << num3 << " is equal to: " << result1 << ".\n";
    else(value1 = *)
    ;result1 = result * num3
    cout << result << " times " << num3 << " is equal to: " << result1 << ".\n";
    else(value1 = /)
    ;result1 = result / num3
    cout << result << " divided by " << num3 << " is equal to: " << result1 << ".\n";



}
{
    cout << "press 1 to enter more numbers, or press 0 to not"
    cin >> cont
    if(cont = 1)
    cout << "please enter the operation,+ for addtion,- for subtaction,* for multiplatcion,/ for division"
    cin >> value1
    ;cout << "please enter the next number: ";
    cin >> num4
    else(cont = 0)

    else(value2 = +)
    ;result2 = result1 + num4;
    cout << result1 << " plus " << num4 << " is equal to: " << result2 << ".\n";
    else(value2 = -)
    ;result2 = result1 + num4;
    cout << result << " minus " << num3 << " is equal to: " << result1 << ".\n";
    else(value2 = *)
    ;result2 = result1 * num4
    cout << result << " times " << num3 << " is equal to: " << result1 << ".\n";
    else(value2 = /)
    ;result2 = result1 / num4
    cout << result << " divided by " << num3 << " is equal to: " << result1 << ".\n";





{
    cout << "press 1 to enter more numbers, or press 0 to not"
    cin >> cont
    if(cont = 1)
   cout << "enter the operation,+ for addtion,- for subtaction,* for multiplatcion,/ for division"
    cin >> value2
    ;cout << "please enter the next number: ";
    cin >> num5

    if(value3 = +)
    ;result3 = result2 + num5;
    cout << result2 << " plus " << num5 << " is equal to: " << result3 << ".\n";
    else(value3 = -)
    ;result3 = result2 - num5
    cout << result << " minus " << num3 << " is equal to: " << result1 << ".\n";
    else(value3 = *)
    ;result3 = result2 * num5
    cout << result << " times " << num3 << " is equal to: " << result1 << ".\n";
    else(value3 = /)
    ;result3 = result2 / num5







    return 0;

错误发生在第34行，其中{ 所以请帮帮我！代码用于基本计算器如果你能纠正第34行，请随时使用它！我不知道是什么原因引起的我是c ++的菜鸟编码所以请帮忙！我做了自己的研究而找不到它。

Answer 1

你不能说像

这样的东西

else(value1 = +)

在C ++中。你必须提出别的意思，但很难猜到是什么，因为你的代码中有很多错误。通常，您不能只输入随机字符并期望一个正常运行的程序。

Answer 2

错误源于{ ... }函数之后的其他main块，因为编译器不知道如何处理声明之外的代码。但这不是您的代码唯一的问题：

在if语句后直接放置分号表示“如果条件为真，则无论如何都不执行任何操作”，并且下一个语句将以任一方式执行。
if(value = +)应为if(value == '+')等 - 您将关联=与比较==混合在一起，另外您尝试使用运算符+而不是字符{ {1}} * '+'应该做什么？代码块放在else(something) s中，而不是{} s

我建议您开始使用像Python这样的简单语言进行编程吗？它有意义的缩进和缺乏分号使生活变得更加容易......

Answer 3

摆脱所有

}
{

您将能够继续修复下一个错误。

当您编写如下大括号时：}

您正在关闭代码块，在这种情况下是您的主要功能。

当您撰写以下内容时：{

编译器认为你正在尝试启动一个新函数，但是没有函数签名而你会收到错误。

在我看来，您希望所有这些代码都在您的main函数中，因此您需要类似以下内容：

int main()
{ 
    //insert all of your code here
    return 0;
}

错误预期在'{'标记之前的notqualified-id

3 个答案: