Question

我正在使用数组，函数和随机数进行项目。当我运行程序时，它会给出一个指向第44行的错误。查看代码，我无法弄清楚问题是什么错误说：int [i]不能在第44行转换为int。

知道出了什么问题吗？顺便问一下，我可以用数字格式化吗？

// Debugging: grades.cpp
#include <iostream>
#include <iomanip>
#include <ctime>

using namespace std;

const int NUM_GRADES = 10;
const int NUM_SUDENTS = 3;

int findHighest( int * );
int findLowest( int * );
void printDatabase( const int [][NUM_GRADES], const char [][ 20 ] );

int main()
{
    int student1[ NUM_GRADES ] = { 0 };
    int student2[ NUM_GRADES ] = { 76, 89, 81, 42, 66, 93, 104,
                                    91, 71, 85 };
    int student3[ NUM_GRADES ] = { 65, 69, 91, 89, 82, 93, 72,
                                    76, 79, 99 };
    char names[ NUM_SUDENTS ][ 20 ] = { "Bob", "John", "Joe" };

    int database[ NUM_SUDENTS ][ NUM_GRADES ];
    int i = 0;

    srand( time( 0 ) );

    // initialize student1
    for ( i = 0; i < NUM_GRADES; i++ )
        student1[ NUM_GRADES ] = rand() % 50 + 50;

    // initialize database
    for ( i = 1; i < NUM_GRADES; i++ ) {
        database[ 0 ][ i ] = student1[ i ];
        database[ 1 ][ i ] = student2[ i ];
        database[ 2 ][ i ] = student3[ i ];
    } // end for

    printDatabase( database,  names );

    for ( i = 0; i < NUM_SUDENTS; i++ ) {
        cout << names[ i ] << "'s highest grade is: "
        << findHighest(database[i]) << endl           // This is line 44 in my program
        << names[ i ] << "'s lowest grade is: "
        << findLowest( database[ i ] ) << endl;
    } // end for
} // end main

 // determine largest grade
int findHighest( int a[] )
 {
    int highest =  a[ 0 ];
    for ( int i = 1; i <= NUM_GRADES; i++ )
        if ( a[ i ] > highest )
            highest = a[ i ];
     return highest;
 } // end function findHighest

 // determine lowest grade
 int findLowest( int a[] )
 {
    int lowest = a[ 0 ];
    for ( int i = 1; i < NUM_GRADES; i++ )
        if ( a[ i ] < lowest )
            lowest = a[ i ];
    return lowest;
 } // end lowestGrade

 // output data
void printDatabase( int a[][ NUM_GRADES ], char names[][ 20 ] )
{
    cout << "Here is the grade database\n\n"
    << setw( 10 ) << "Name";
    for ( int n = 1; n <= NUM_GRADES; n++ )
        cout << setw( 4 ) << n;
    cout << endl;
    for ( int i = 0; i < NUM_SUDENTS; i++ ) {
        cout << setw( 10 ) << names[ i ];
        for ( int j = 0; j < NUM_GRADES; j++ )
            cout << setw( 4 ) << a[ i, j ];
        cout << endl;
    } // end for
    cout << endl;
} // end printDatabase

Answer 1

所以在查看之后我发现了一个编译错误。＆＃34; printDatabase＆＃34;定义和声明不匹配。声明声明函数为const参数，但定义没有。

然而，一旦修复，运行时就会出现错误。问题在这里

for ( i = 0; i < NUM_GRADES; i++ )
    student1[ NUM_GRADES ] = rand() % 50 + 50;

student1是NUM_GRADES的索引，这是student1数组的长度。但是，由于数组索引从0开始，最后一个索引将是NUM_GRADES - 1.因此，在这里写出超出数组的范围。虽然我相信查看代码所追求的行为是用i

索引

for ( i = 0; i < NUM_GRADES; i++ )
    student1[ i] = rand() % 50 + 50;

数组，函数和随机

1 个答案: