Question

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
// Declare variable  
    ifstream inFile;
// Declare constant 
    const int MAX = 600;
// Declare an array of strings named name that holds up to MAX 
    string name[MAX] = {};
// Declare an array of whole numbers named grade that holds up to MAX
    double grade[MAX] = {};
// Declare variables quantity, x, avg, and sum (initialized to zero) that hold whole numbers 
    int sum = 0, avg, x, quantity;
// Open input file
    inFile.open("indata3.txt");
// Check if the file was opened
    if (!inFile)
    {
    cout << "File was not found!" << endl;
    return 1;
    }
// Set x to 0 
    x = 0;
// Read name and grade from the file and assign them to name[x] and grade[x] 
    inFile >> name[x];
    inFile >> grade[x];
// While (not-end-of-file) 
    while(!inFile.eof())
    {
//Increment x 
    x++;
//  Read a name and a grade from the file and assign them to name[x] and grade[x] 
    inFile >> name[x];
    inFile >> grade[x];
    }
// Print message 
    cout << "Enter quantity of grades to be processed (0-" << x << "): " << endl;
// Read a value from the keyboard and assign it to quantity 
    cin >> quantity;
// For (x = 0 to quantity-1)
    for (x = 0; x <= quantity-1)
    {
// Accumulate grade[x] in sum 
    grade[x]+=sum;
    }
// Assign to avg the value returned by average (sum, quantity)
    avg = sum/quantity;
// Print "Average grade: ", avg 
    cout << "Average grade: " << avg << endl;
// Print "Name", "Grade", "   Comment" 
    cout << "Name" << "," << "Grade" << "," << "   Comment"  << endl;
// For (x = 0 to quantity-1) 
    for (x = 0; x <= quantity-1)
{
// Print name[x], grade[x]
    cout << name[x] << ", " << grade[x] << endl;
// If (grade[x] < avg) 
    if (grade[x] < avg)
    {
//  Print "   below average"
    cout << "   below average" << endl;
    }
// Else if (grade[x] > avg) 
    else if (grade[x] > avg)
    {
//  Print "   above average"
    cout << "   above average" << endl;
    }
// Else
    else()
    {
//  Print "   average"
    cout << "   average" << endl;
    }
}
// Close the file.
    inFile.close();

return 0;
}

我相信我的代码很好，但我有4个语法错误，包括以下内容：

.cpp(49) : error C2143: syntax error : missing ';' before ')'
.cpp(61) : error C2143: syntax error : missing ';' before ')'
.cpp(78) : error C2059: syntax error : ')'
.cpp(79) : error C2143: syntax error : missing ';' before '{'

问题可能在于for循环是如何嵌套的，但我不太确定究竟在哪里修复它，因为我已经玩了一下它。任何帮助都会非常感谢！还警告你，我是一个菜鸟，为丑陋的代码感到抱歉。

Answer 1

您的编译器抱怨您有语法错误？很可能是因为你有语法错误......

for (a; b; c) {
           |  For loop has 3 parts...

else() // It should be else {
     | else cannot have a condition, let alone an empty one

阅读编译器错误并修复它所说的内容。

http://ideone.com/3ZJjaO - 编译器错误

http://ideone.com/kMCKIV - 编译器错误已修复

注意：你有一些工作要领先，你有一系列无限的looooooooops以及其他问题。可能值得拿起一本书并尝试所有的例子。

我的代码在语法上不正确？

1 个答案: