【发布时间】：2013-08-31 02:34:30
【问题描述】：
这是我的全部代码（在 C++ 中），以备不时之需。我正在使用 Eclipse Kepler。
//Tutorials from www.cplusplus.com/doc/tutorial combined
#include <iostream>
using namespace std;
//tutorial #1.1 Function with type -- Addition
int addition (int a, int b)
{
int r;
r=a+b;
return (r);
}
//tutorial #1.2 Function with type -- Subtraction
int subtraction (int a, int b){
int r;
r=a-b;
return (r);
}
//tutorial #1.3 Function with NO type
void printmessage (void)
{
cout << "It's good to be the king." << '\n';
}
//tutorial #2.1 Arguments passed by reference
void duplicate (int& a, int& b, int& c)
{
a*=2;
b*=2;
c*=2;
}
//tutorial #2.2 and 2.5 Arguments passed by value and Declaration of preferred inline function
inline void prevnext (int x, int& prev, int& next)
{
prev = x-1;
next = x+1;
}
//tutorial #2.3 Default values in parameters (functions)
int divide (int a, int b=2)
{
int r;
r=a/b;
return (r);
}
//tutorial #2.4.1 Overloaded functions -- int cannot handle decimals
int operate (int a, int b)
{
return (a*b);
}
//tutorial #2.4.2 Overloaded functions -- float is used with decimals
float operate (float a, float b)
{
return (a/b);
}
//tutorial #2.6 Recursivity -- factorial calculator
long factorial (long a)
{
if (a > 1)
return (a * factorial (a-1));
else
return (1);
}
//tutorial #2.7 Declaring function prototypes
void odd (int a); //declared
void even (int a); //declared
void odd (int a) //defined
{
if ((a%2)!=0) cout << "Number is odd.\n";
else even (a);
}
void even (int a) //defined
{
if ((a%2)==0) cout << "Number is even.\n";
else odd (a);
}
//tutorial #3.1 Initializing and accessing the values of an array
float billy [] = {16, 2, 77, 40, 12071};
float k, result=0;
int main ()
{
cout << "Name: My Name \n";
cout << "Homework: 1";
cout << endl;
cout << endl;
int x=8, y=1, z, aa;
float n=3.0,m=9.0;
long number;
z = addition (4,2);
aa = subtraction (6,3);
cout << "The sum is " << z << '\n';
cout << "The subtraction is " << aa << '\n';
cout << "The second subtraction is " << subtraction(x,y) << '\n';
z = addition (x,y) - 3;
cout << "The new sum is " << z << '\n';
printmessage();
duplicate (x,y,z);
cout << "x=" << x << ", y=" << y << ", z=" << z << '\n';
prevnext (x, y, z);
cout << "Previous=" << y << ", Next=" << z;
cout << endl;
cout << "Division = " << divide (14);
cout << endl;
cout << "Second Division = " << divide (10,8);
cout << endl;
cout << "Operate Multiply: " << operate(x,y);
cout << '\n';
cout << "Operate Divide: " << operate(n,m);
cout << endl;
cout << "Please type a number: ";
cin >> number;
cout << number << "! = " << factorial (number);
cout << endl;
int i;
do {
cout << "Type a number (type 0 to exit): ";
cin >> i;
odd (i);
} while (i!=0);
for ( k=0 ; k<5 ; k++ )
{
result += billy[k];
}
cout << result;
return 0;
}
这是我编写的主要代码中存在问题的部分。更具体地说，结果 += billy[k] 行抛出错误：
for ( k=0 ; k<5 ; k++ )
{
result += billy[k];
}
cout << result;
这对应于：
//tutorial #3.1 Initializing and accessing the values of an array
float billy [] = {16, 2, 77, 40, 12071};
float k, result=0;
我需要帮助修复此代码，但最重要的是我想知道为什么我的代码向我抛出了这个错误，以及如何使它变得更好（在初级水平上——显然，我不是在此处实施高级概念）。
编辑晚上 11:10 我忘记将其切换回 int。我最初有 int 但由于错误我想我会尝试 float 看看它是否有所作为。
【问题讨论】：
-
为什么要使用浮点数据类型从0迭代到5？
-
尝试将变量声明得更接近它们的使用位置。特别是，在 for 循环中声明计数变量。例如，
for (int k = 0; k < 5; k++)这将更容易发现错误，例如使用了错误的类型。 -
克里斯，我在原始帖子中添加了一条关于我为什么使用浮动的注释。尼尔柯克，我按照你的建议尝试了，但我仍然遇到同样的错误。不过感谢您的建议，因为从现在开始我肯定会继续这样做。
-
在仍然出现错误的情况下尽量从代码中删减，然后发布一个新问题。
标签： c++ arrays eclipse compiler-errors