Question

这是我教科书中的练习作业，用于计算分数。它需要7分，并且最高和最低。

我认为没有语法错误，但我得到一个未解决的外部符号错误。我寻找类似的问题，似乎问题可能是使用函数而不是定义它。我已经定义了所有函数，但在main或calculatecore中可能都不正确。我是c ++的新手，非常感谢您解决这个问题。谢谢

这是我在VisualStudio上得到的错误

错误LNK2019：未解析的外部符号“float __cdecl calculateScore（float * const，int，float）”（？calculateScore @@ YAMQAMHM @ Z）在函数_main中引用

#include <iostream>
using namespace std;

void printHeader(int judges);
void enterData (float scores[], int judges, float difficulty);
float calculateScore(float scores[], const int judges, float difficulty);
int findLeast(float scores[], const int judges);
int findMax(float scores[], const int judges);

int main () {
    const int judges = 7;
    float scores [judges];
    float difficulty = 0;
    float finalscore = calculateScore(scores, judges, difficulty);



printHeader (judges);
    enterData (scores, judges, difficulty);  // get user input
    findLeast(scores, judges); // find lowest score 
    findMax(scores, judges); // find highest score
    calculateScore (scores, judges, difficulty); // get final score
    cout << "The final score is " << finalscore << '\n';

    return 0;
}

void printHeader(const int judges) {
    cout << "This program calculates a divers score over" << judges << "judges"; 
}

void enterData(float scores[], const int judges, float difficulty) {
    for (int i = 0; i < judges; i++){
        cout <<"Enter score for judge " << i+1 << endl; 
        cin >> scores[i];
    }
    cout << "Enter difficulty: "<< endl;
    cin >> difficulty;
}

这是我计算在main中调用的分数的函数。它应该是一个无效函数吗？

float calculateScore(float scores[], const int judges, float difficulty, int maxScore, int least) {
    float sum = 0;
        for (int i = 0; i < judges; i++) {
        sum += scores[i];
    }
    return sum - scores[least] - scores[maxScore] * difficulty * .6;
}


int findLeast(float scores[], const int judges) {
    int least = 0;
    for (int i = 1; i< judges; i++)
        if (scores[i] < scores[least])
            least = i;
    return least;
}

int findMax(float scores[], const int judges) {
    int maxScore = 0;
    for (int i = 1; i< judges; i++)
        if (scores[i] > scores[maxScore]) {
            maxScore = i; 
        }
    return  maxScore;
}

Answer 1

您正在使用主函数中的calculateScore调用float * const,int,float，而实际方法的签名为float scores[], const int judges, float difficulty, int maxScore, int least。

总之，您在调用main()中的函数时缺少参数。该方法需要一个数组scores[]，一个整数judges，一个浮点difficulty和一个int maxScore，以及一个int least，但你'我们只提供float*（与float[]不同），int和另一个float。

因此，您没有提供正确的类型/数量的参数，并且编译器告诉您它无法找到具有这些参数类型的方法。

与您的错误无关的问题是，在您的方法定义（calculateScore）中，您使用maxScore作为scores的索引，而maxScore似乎只是值{最高分。因此，您只需使用scores[maxScore]替换maxScore即可。 least也是如此 - 它是一个值，而不是一个索引，因此您可以使用least代替scores[least]。

Answer 2

此签名适用于您编写的功能：float calculateScore(float scores[], const int judges, float difficulty, int maxScore, int least)

这是你的原型：float calculateScore(float scores[], const int judges, float difficulty);

它们不匹配是签名。

首先，您应该将原型更改为：

float calculateScore(float scores[], const int judges, float difficulty, int maxScore, int least);

正如所指出的那样，你应该用5种类型的varibleas调用你的函数：float []，const int，float，int，int而不是float []，const int，float

我认为你想要的主要是：

int max = findMax(scores, judges);
int min = findLeast(scores, judges);
calculateScore (scores, judges, difficulty, max, min);

Answer 3

将主内部的代码重写为以下内容：

  const int judges = 7;
  float scores [judges];
  float difficulty = 0;
  float finalscore;
   
  printHeader (judges);
  int leastTemp;
  int maxTemp;
  enterData (scores, judges, difficulty);  // get user input
  leastTemp = findLeast(scores, judges); // find lowest score 
  maxTemp = findMax(scores, judges); // find highest score
  finalscore = calculateScore (scores, judges, difficulty, maxTemp, leastTemp); // get final score
  cout << "The final score is " << finalscore << '\n';

  return 0;

这样你就可以将两个缺失的参数放入函数calculateScore。

C ++简单计算数组得分

3 个答案: