有人可以帮我这个代码吗？我不知道为什么不工作？ [英] Can someone please help me with this code? I don't know why it isn't working?
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问题描述
#include < iostream >
使用 命名空间标准;
/ *
* InflationRate - 根据新旧消费者物价指数计算通货膨胀率
* @param old_cpi：是一年前的消费者价格指数
* @param new_cpi：是当前的消费者价格指数
* @returns计算的通货膨胀率或0如果输入无效。
* /
void getCPIValues（float& old_cpi，float& new_cpi）;
double InflationRate（ float old_cpi， float new_cpi）;
void swap_values（double& a，double& b）;
void sort_array（ double MAX_RATE []， int numRates）;
double findMedian（ double MAX_RATES []， int numRates）;
const int MAX_RATES = 20 ;
int main（） // C ++程序首先执行函数main
{
// ＃ 1：为旧的消费者价格指数（cpi）和新的cpi
声明两个浮点变量 float old_cpi，new_cpi，infrt，sum = 0 ，avg;
再次 char ;
int crt = 0 ;
double array [MAX_RATES];
int numRates;
执行
{
// ＃2：读取cpi的两个浮点值并将它们存储在变量中
getCPIValues（old_cpi，new_cpi）;
// ＃3：用两个cpis调用函数InflationRate
// ＃4：打印结果
infrt = InflationRate（old_cpi，new_cpi ）;
if （infrt！= 0 ）
{
sum + = infrt; CRT ++;
}
cout<< 通货膨胀率为<< infrt<< ENDL;
for （ int i = 0 ; i< array [MAX_RATES]; i ++）
cin>> numRates;
// int numRates = sizeof（array）/ sizeof（MAX_RATES []）;
// 奖金＃1：将逻辑放入＃ 2-4循环中要求用户输入'y'如果有更多数据
cout<< 再试一次？（y或Y）：;
cin>>再次;
} while （（再次== ' Y'）||（再次== ' y'））;
// 奖金＃2：保持有效通胀率和数字的总计计算费率来计算平均费率。
// 在循环后打印结果
// 计算平均值
avg = sum / crt;
cout<< 平均费率为<< avg<< ENDL;
cout<< 中位数为<< findMedian（MAX_RATES []，numRates）<< ENDL;
return 0 ;
}
// 函数要求用户输入新旧消费者价格指数
// 检查数字是否大于0
void getCPIValues（float& old_cpi，float& new_cpi）
{
do
{
cout<< 输入旧的和新的消费者价格指数：;
cin>> old_cpi>> new_cpi;
if （（old_cpi< = 0 ）||（new_cpi< = 0 ））
{
cout<< 错误：CPI值必须大于0.;
}
} while （（old_cpi< = 0 ）||（ new_cpi< = 0 ））;
}
// double InflationRate（float old_cpi，float new_cpi）
// 前提条件：两个价格必须大于0.0
< span class =code-comment> // 后置条件：无效输入返回通货膨胀率为0
double InflationRate（ float old_cpi， float new_cpi）
{
if （（old_cpi< = 0 ）||（new_cpi< = < span class =code-digit> 0 ）|| old_cpi == new_cpi）
{
return 0 ;
}
else
// 实施InflationRate以计算增加或减少的百分比
// 使用（new_cpi - old_cpi）/ old_cpi * 100
return （（new_cpi - old_cpi）/ old_cpi * 100 ）;
}
void swap_values（double& a，double& b）
{
double temp;
a = b;
b = temp;
}
void sort_array（ double MAX_RATE []， int numRates）
{
int index_of_smallest;
for （ int i = 0 ; i< numRates - 1 ; i ++）
{
index_of_smallest = i;
for （ int j = i + 1; j< numRates; j ++）
{
if （MAX_RATES [j]< MAX_RATES [index_of_smallest]）
{
index_of_smallest = j;
}
}
swap_values（& MAX_RATES [index_of_smallest]，& MAX_RATES [i]）
}
}
double findMedian（ double MAX_RATES []， int numRates ）
{
// 对数组进行排序
sort_array（MAX_RATES ，MAX_RATES + numRates）;
// 检查偶数情况
if （numRates％ 2 ！= 0 ）
return （ double ）MAX_RATES [numRates / 2];
return （ double ）（MAX_RATES [（numRates- 1 ）/ 2] + MAX_RATES [numRates / 2]）/ 2. 0 ;
}
我的尝试：
错误：
在函数'int main（）'中：
61:55：错误：在']'令牌之前预期的primary-expression
函数'void sort_array（double *，int）'：
114：28：error：无效类型'const int [int]'对于数组下标
114：59：错误：无效类型'const int [int]'对于数组下标
119：49：错误：无效类型'const int [int]'对于数组下标
119：64：错误：无效类型'const int [int ]'for array下标
在函数'double findMedian（double *，int）'中：
126：35：错误：从'double *'无效转换为'int'[-fpermissive]
105：6：注意：初始化'void sort_array（double *，int）'的参数2
解决方案
希望这会对你有所帮助。
#include< iostream>
using namespace std;
/ *
* InflationRate - 根据新旧消费者价格指数计算通货膨胀率
* @param old_cpi：是一年前的消费者价格指数
* @param new_cpi：是当前的消费者价格指数
* @returns计算的通货膨胀率或0如果输入无效。
* /
void getCPIValues（float& old_cpi，float& new_cpi）;
double InflationRate（float old_cpi，float new_cpi）;
void swap_values（double& a，double& b）;
void sort_array（double MAX_RATE []，int numRates）;
double findMedian（double MAX_RATES []，int numRates）;
const int MAX_RATES = 20;
int main（）// C ++程序首先执行函数main
{
//＃1：为旧的消费者价格指数（cpi）声明两个浮点变量新的cpi
浮动old_cpi，new_cpi，infrt，sum = 0，avg;再次
char;
int crt = 0;
double array [MAX_RATES];
int numRates;
do
{
//＃2：读取cpi的两个浮点值并将它们存储在变量
getCPIValues（old_cpi，new_cpi）;
//＃3：用两个cpis调用函数InflationRate
//＃4：打印结果
infrt = InflationRate（old_cpi，new_cpi）;
if（infrt！= 0）
{
sum + = infrt; CRT ++;
}
cout<< 通货膨胀率是<< infrt<< ENDL;
for（int i = 0; i< array [MAX_RATES]; i ++）
cin>> numRates;
// int numRates = sizeof（array）/ sizeof（MAX_RATES []）;
// BONUS＃1：将＃2-4中的逻辑置于循环中，如果有更多数据，则要求用户输入'y'
cout<< ; 再试一次？（y或Y）：;
cin>>再次;
} while（（再次=='Y'）||（再次=='y'））;
//奖金＃2：保持有效通货膨胀率和计算费率的总和，以计算平均费率。
//在循环后打印结果
//计算平均值
avg = sum / crt;
cout<< 平均速率是<< avg<< ENDL;
cout<< 中值率是<< findMedian（array，numRates）<< ENDL;
返回0;
}
//函数要求用户输入旧的和新的消费者价格指数
//检查数字是否大于0
void getCPIValues（float& ; old_cpi，float& new_cpi）
{
do
{
cout<< 输入旧的和新的消费者价格指数：;
cin>> old_cpi>> new_cpi;
if（（old_cpi< = 0）||（new_cpi< = 0））
{
cout<< 错误：CPI值必须大于0。
}
} while（（old_cpi< = 0）||（new_cpi< = 0））;
}
// double InflationRate（float old_cpi，float new_cpi）
//前提条件：两个价格必须大于0.0
//后置条件：通货膨胀率返回或0表示无效输入
double InflationRate（float old_cpi，float new_cpi）
{
if（（old_cpi< = 0）||（new_cpi< = 0）|| old_cpi == new_cpi）
{
返回0;
}
其他
//实施InflationRate计算增加或减少百分比
//使用（new_cpi - old_cpi）/ old_cpi * 100
返回（（new_cpi - old_cpi）/ old_cpi * 100）;
}
void swap_values（double& a，double& b）
{
double temp = 0.0f;
a = b;
b = temp;
}
void sort_array（double MAX_RATE []，int numRates）
{
int index_of_smallest;
for（int i = 0; i< numRates - 1; i ++）
{
index_of_smallest = i;
for（int j = i + 1; j< numRates; j ++）
{
if（MAX_RATE [j]< MAX_RATE [index_of_smallest]）
{
index_of_smallest = j;
}
}
swap_values（MAX_RATE [index_of_smallest]，MAX_RATE [i]）;
}
}
double findMedian（double MAX_RATE []，int numRates）
{
//排序数组
sort_array（MAX_RATE ，MAX_RATES + numRates）;
//检查偶数情况
if（numRates％2！= 0）
return（double）MAX_RATE [numRates / 2];
return（double）（MAX_RATE [（numRates - 1）/ 2] + MAX_RATE [numRates / 2]）/ 2.0;
}
查看错误消息：
61:55：错误：']'令牌之前的预期主要表达式
第61行，第55栏 - 它在结束方括号之前需要一些东西。
我'我猜这是这一行：
cout<< 中值率是<< findMedian（MAX_RATES []，numRates）<< endl;
MAX_RATES []需要[和]之间的索引值数组索引指示符..
对其他消息执行相同操作 - 它们都为您提供行号和列号，因此请使用IDE或编辑器准确查找他们指的是哪一行和一列。这应该会让你知道你输错了什么！
引用：有人可以请帮助我用这个代码？我不知道它为什么不起作用？
学会自救！编译器为您提供了大量的提示，学会使用它们。
Quote：在函数'int main（）'：
61 ： 55 ：错误：在']之前预期的primary-expression '令牌
在功能 main（）行 61 位置 55
cout<< 中位数为<< findMedian（MAX_RATES [] ，numRates）<< ENDL;
^ 此 char
编译器不喜欢它。
- 检查你在做什么。 ' [] '用于数组。
- 什么是 MAX_RATES ？
const int MAX_RATES = 20 ;
MAX_RATES 是一个全局常量，而不是数组，编译器不明白你尝试做什么。
Nota：至少作为初学者，在本地和全局定义的混合中使用相同的名称总是一个坏主意。
< blockquote class =quote>Quote：114：28：错误：无效类型'const int [int]'对于数组下标
114：59 ：错误：数组下标的无效类型'const int [int]'
如果 （MAX_RATES [j]< MAX_RATES [index_of_smallest]）
这里再次使用像数组一样的整数常量。
#include <iostream>
using namespace std;
/*
* InflationRate - calculates the inflation rate given the old and new consumer price index
* @param old_cpi: is the consumer price index that it was a year ago
* @param new_cpi: is the consumer price index that it is currently
* @returns the computed inflation rate or 0 if inputs are invalid.
*/
void getCPIValues(float& old_cpi, float& new_cpi);
double InflationRate(float old_cpi, float new_cpi);
void swap_values(double& a, double& b);
void sort_array (double MAX_RATE[], int numRates);
double findMedian(double MAX_RATES[], int numRates);
const int MAX_RATES = 20;
int main() //C++ programs start by executing the function main
{
// #1: declare two float variables for the old consumer price index (cpi) and the new cpi
float old_cpi, new_cpi, infrt, sum = 0, avg;
char again;
int crt = 0;
double array[MAX_RATES];
int numRates;
do
{
// #2: Read in two float values for the cpi and store them in the variables
getCPIValues(old_cpi, new_cpi);
// #3: call the function InflationRate with the two cpis
// #4: print the results
infrt = InflationRate(old_cpi, new_cpi);
if (infrt != 0)
{
sum += infrt; crt++;
}
cout << "Inflation rate is " << infrt << endl;
for (int i = 0; i < array[MAX_RATES]; i++)
cin >> numRates;
//int numRates = sizeof(array)/sizeof(MAX_RATES[]);
// BONUS #1: Put the logic in #2-4 in a loop that asks the user to enter 'y' if there's more data
cout << "Try again? (y or Y): ";
cin >> again;
} while((again == 'Y') || (again == 'y'));
// BONUS #2: Keep a running total of the valid inflation rates and the number of computed rates to calculate the average rate.
// Print the results after the loop
// calculate average
avg = sum/crt;
cout << "Average rate is " << avg << endl;
cout << "Median rate is " << findMedian(MAX_RATES[], numRates) << endl;
return 0;
}
// function ask the user to input the old and new consumer price indices
// check if the numbers are greater than 0
void getCPIValues (float& old_cpi, float& new_cpi)
{
do
{
cout << "Enter the old and new consumer price indices: ";
cin >> old_cpi >> new_cpi;
if((old_cpi <= 0) || (new_cpi <= 0))
{
cout << "Error: CPI values must be greater than 0.";
}
} while ((old_cpi <= 0) || (new_cpi <= 0));
}
// double InflationRate(float old_cpi, float new_cpi)
// precondition: both prices must be greater than 0.0
// postcondition: the inflation rate is returned or 0 for invalid inputs
double InflationRate(float old_cpi, float new_cpi)
{
if ((old_cpi <= 0) || (new_cpi <= 0) || old_cpi == new_cpi)
{
return 0;
}
else
// Implement InflationRate to calculate the percentage increase or decrease
// Use (new_cpi - old_cpi) / old_cpi * 100
return ((new_cpi - old_cpi) / old_cpi * 100);
}
void swap_values(double& a, double& b)
{
double temp;
a = b;
b = temp;
}
void sort_array (double MAX_RATE[], int numRates)
{
int index_of_smallest;
for (int i = 0; i < numRates -1; i++)
{
index_of_smallest = i;
for (int j = i+1; j < numRates; j++)
{
if (MAX_RATES[j] < MAX_RATES[index_of_smallest])
{
index_of_smallest = j;
}
}
swap_values(&MAX_RATES[index_of_smallest], &MAX_RATES[i])
}
}
double findMedian(double MAX_RATES[], int numRates)
{
// sort the array
sort_array(MAX_RATES, MAX_RATES+numRates);
// check for even case
if (numRates % 2 != 0)
return (double)MAX_RATES[numRates/2];
return (double)(MAX_RATES[(numRates-1)/2] + MAX_RATES[numRates/2])/2.0;
}
What I have tried:
Error:
In function 'int main()': 61:55: error: expected primary-expression before ']' token In function 'void sort_array(double*, int)': 114:28: error: invalid types 'const int[int]' for array subscript 114:59: error: invalid types 'const int[int]' for array subscript 119:49: error: invalid types 'const int[int]' for array subscript 119:64: error: invalid types 'const int[int]' for array subscript In function 'double findMedian(double*, int)': 126:35: error: invalid conversion from 'double*' to 'int' [-fpermissive] 105:6: note: initializing argument 2 of 'void sort_array(double*, int)'
解决方案
Hope this will help you.
#include <iostream> using namespace std; /* * InflationRate - calculates the inflation rate given the old and new consumer price index * @param old_cpi: is the consumer price index that it was a year ago * @param new_cpi: is the consumer price index that it is currently * @returns the computed inflation rate or 0 if inputs are invalid. */ void getCPIValues(float& old_cpi, float& new_cpi); double InflationRate(float old_cpi, float new_cpi); void swap_values(double& a, double& b); void sort_array(double MAX_RATE[], int numRates); double findMedian(double MAX_RATES[], int numRates); const int MAX_RATES = 20; int main() //C++ programs start by executing the function main { // #1: declare two float variables for the old consumer price index (cpi) and the new cpi float old_cpi, new_cpi, infrt, sum = 0, avg; char again; int crt = 0; double array[MAX_RATES]; int numRates; do { // #2: Read in two float values for the cpi and store them in the variables getCPIValues(old_cpi, new_cpi); // #3: call the function InflationRate with the two cpis // #4: print the results infrt = InflationRate(old_cpi, new_cpi); if (infrt != 0) { sum += infrt; crt++; } cout << "Inflation rate is " << infrt << endl; for (int i = 0; i < array[MAX_RATES]; i++) cin >> numRates; //int numRates = sizeof(array)/sizeof(MAX_RATES[]); // BONUS #1: Put the logic in #2-4 in a loop that asks the user to enter 'y' if there's more data cout << "Try again? (y or Y): "; cin >> again; } while ((again == 'Y') || (again == 'y')); // BONUS #2: Keep a running total of the valid inflation rates and the number of computed rates to calculate the average rate. // Print the results after the loop // calculate average avg = sum / crt; cout << "Average rate is " << avg << endl; cout << "Median rate is " << findMedian(array, numRates) << endl; return 0; } // function ask the user to input the old and new consumer price indices // check if the numbers are greater than 0 void getCPIValues(float& old_cpi, float& new_cpi) { do { cout << "Enter the old and new consumer price indices: "; cin >> old_cpi >> new_cpi; if ((old_cpi <= 0) || (new_cpi <= 0)) { cout << "Error: CPI values must be greater than 0."; } } while ((old_cpi <= 0) || (new_cpi <= 0)); } // double InflationRate(float old_cpi, float new_cpi) // precondition: both prices must be greater than 0.0 // postcondition: the inflation rate is returned or 0 for invalid inputs double InflationRate(float old_cpi, float new_cpi) { if ((old_cpi <= 0) || (new_cpi <= 0) || old_cpi == new_cpi) { return 0; } else // Implement InflationRate to calculate the percentage increase or decrease // Use (new_cpi - old_cpi) / old_cpi * 100 return ((new_cpi - old_cpi) / old_cpi * 100); } void swap_values(double& a, double& b) { double temp = 0.0f; a = b; b = temp; } void sort_array(double MAX_RATE[], int numRates) { int index_of_smallest; for (int i = 0; i < numRates - 1; i++) { index_of_smallest = i; for (int j = i + 1; j < numRates; j++) { if (MAX_RATE[j] < MAX_RATE[index_of_smallest]) { index_of_smallest = j; } } swap_values(MAX_RATE[index_of_smallest], MAX_RATE[i]); } } double findMedian(double MAX_RATE[], int numRates) { // sort the array sort_array(MAX_RATE, MAX_RATES + numRates); // check for even case if (numRates % 2 != 0) return (double)MAX_RATE[numRates / 2]; return (double)(MAX_RATE[(numRates - 1) / 2] + MAX_RATE[numRates / 2]) / 2.0; }
Look at the error message:
61:55: error: expected primary-expression before ']' token
Line 61, column 55 - it expects something before the closing square bracket.
I'm guessing that it's this line:
cout << "Median rate is " << findMedian(MAX_RATES[], numRates) << endl;
And theMAX_RATES[]needs an index value between the "[" and "]" array index indicators..
Do the same thing with the other messages - they all give you a line and column number, so use your IDE or editor to find out exactly which line and column they are referring to. That should give you a good idea what you typed wrong!
Quote:Can someone please help me with this code? I don't know why it isn't working?
Learn to help yourself ! The compiler gives you tons of hints, learn to use them.
Quote:In function 'int main()':
61:55: error: expected primary-expression before ']' token
In function main() line 61 position 55
cout << "Median rate is " << findMedian(MAX_RATES[], numRates) << endl; ^ this char
The compiler don't like it.
- Check what you are doing. '[]' is used with arrays.
- What is MAX_RATES ?
const int MAX_RATES = 20;
MAX_RATES is a global constant, not an array, the compiler don't understand what you try to do.
Nota: It is always a bad idea to use the same name for many things with a mixing of local and global defines, at least as a beginner.
Quote:114:28: error: invalid types 'const int[int]' for array subscript
114:59: error: invalid types 'const int[int]' for array subscript
if (MAX_RATES[j] < MAX_RATES[index_of_smallest])
Here again, you use the integer constant like an array.
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