Question

//This program averages 4 grades and assigns a letter grade based on the numeric average.
#include <iostream>
using namespace std;

int main()
{
    int g1, g2, g3, g4; //Numeric grades to be averaged.

    cout << "This program averages 4 grades. \n"; // Gathers number inputs to output GPA (Grade Point Average)
    cout << "Enter first grade \n";
    cin >> g1;
    cout << "Enter second grade \n";
    cin >> g2;
    cout << "Enter third grade \n";
    cin >> g3;
    cout << "Enter fourth grade \n";
    cin >> g4;
    cout << "Your average is: \n";

    const int 
        gpa = ((g1 + g2 + g3 + g4) / 4.0); // Average of g1, g2, g3, and g4.
        rep = "Your GPA letter grade is: \n"; // Placeholder for the letter grade reply string.

    cout << gpa

    cout << gpa; // Outputs letter grade string
    if (gpa >= 90)
        cout << rep "A";
    else if (gpa >= 80)
        cout << rep "B";
    else if (gpa >= 70)
        cout << rep "C";
    else if (gpa >= 60)
        cout << rep "D";
    else if (gpa >= 0)
        cout << rep "F";
    else 
        cout  << "Invalid grade entered, enter positive digits only. \n"

    system("pause");
    return 0;
}

我收到以下错误消息：

1>c:\users\seven\source\repos\project2\project2\source.cpp(9): error C2144: syntax error: 'int' should be preceded by ';'

1>c:\users\seven\source\repos\project2\project2\source.cpp(9): error C2270: 'main': modifiers not allowed on nonmember functions

1>c:\users\seven\source\repos\project2\project2\source.cpp(14): error C2062: type 'int' unexpected

我特别不明白第一个错误。我为什么要一个;在int之前？ “; int”，在每种情况下都有一个;在行之前的“ int”之前。抱歉，如果我没有正确地寻求帮助。尽我所能，谢谢！

Answer 1

#include <iostream>

using namespace std;

int main()
{
int g1, g2, g3, g4; //Numeric grades to be averaged.

cout << "This program averages 4 grades. \n"; // Gathers number inputs to output GPA (Grade Point Average)
cout << "Enter first grade \n";
cin >> g1;
cout << "Enter second grade \n";
cin >> g2;
cout << "Enter third grade \n";
cin >> g3;
cout << "Enter fourth grade \n";
cin >> g4;
cout << "Your average is: \n";

const int gpa = ((g1 + g2 + g3 + g4) / 4.0); // Average of g1, g2, g3, and g4.
const string rep = "Your GPA letter grade is: \n"; // Placeholder for the letter grade reply string.

cout << gpa;

cout << gpa; // Outputs letter grade string
if (gpa >= 90) {
    cout << rep << "A";
}else if (gpa >= 80){
    cout << rep << "B";
}else if (gpa >= 70){
    cout << rep << "C";
}else if (gpa >= 60){
    cout << rep << "D";
}else if (gpa >= 0){
    cout << rep << "F";
}else{ 
    cout  << "Invalid grade entered, enter positive digits only. \n";
}
system("pause");
return 0;
}

请检查您的语法。所有错误都是由语法错误引起的。

我是一个初学者，我无法理解我的c ++程序中的以下错误

1 个答案: