Question

在visual studio中，我可以清楚地看到rstr()（反向字符串）函数返回“olla \ 0”，但控制台显示屏显示不可读的字符符号。另外，由于某种原因，在调用printf()之后，变量reverse在调试模式下观察变量时也会转换为不可读的字符值。有谁知道如何正确显示rstr()返回的字符串？

#include "stdio.h"

const char* rstr(const char* message) {

    const int msg_size = sizeof(message) / sizeof(message[0]);
    char r[msg_size + 1];

    for (int i = 0; i < msg_size; ++i) {
        r[i] = message[msg_size - i - 1];
        if (i == (msg_size - 1))
            r[msg_size] = '\0';
    }

    return r;
}

int main() 
{
    const char* reversed = rstr("allo");
    printf("Reversed string is: %s\n", reversed);

    getchar();
    return 0;
}

Answer 1

Private Sub Worksheet_Change(ByVal Target As Range)
    If Intersect(Target, Range("A1")) Is Nothing Then Exit Sub
    On Error GoTo ReEnableEvents
    Application.EnableEvents = False
    Dim lastRow As Long
    Dim r As Long
    Dim c As Long
    Dim newRow As Long
    Dim Speciality As String
    Speciality = Range("A1").Value
    'clear existing data
    lastRow = Cells(Rows.Count, "A").End(xlUp).Row
    If lastRow > 2 Then ' Assume headings are on row 2
        Rows("3:" & lastRow).ClearContents
    End If
    'find new data
    newRow = 2
    With Worksheets("MasterList")
        For r = 2 To .Cells(.Rows.Count, "A").End(xlUp).Row
            For c = 2 To 11 ' loop through the speciality columns
                If .Cells(r, c).Value = Speciality Then
                    newRow = newRow + 1
                    Cells(newRow, "A").Value = .Cells(r, "A").Value
                    Cells(newRow, "B").Value = .Cells(r, "L").Value
                    Cells(newRow, "C").Value = .Cells(r, "M").Value
                    Cells(newRow, "D").Value = .Cells(r, "N").Value
                    Cells(newRow, "E").Value = .Cells(r, "O").Value
                    Cells(newRow, "F").Value = .Cells(r, "P").Value
                    Cells(newRow, "G").Value = .Cells(r, "Q").Value                        
                    Exit For
                End If
            Next
        Next
    End With
ReEnableEvents:
    Application.EnableEvents = True
End Sub

这里都错了。

消息是const int msg_size = sizeof(message) / sizeof(message[0]);，因此char*将是指向char的指针的大小。

由于sizeof(message)是一个字符，message[0]是一个定义。所以你的sizeof(message[0])将是指向char的指针的大小。

您需要将String的长度传递给msg_size函数。

为什么我对printf（）的调用不能在控制台中显示正确的字符？

1 个答案: