est.c:74:24: error: expected expression before ‘class_t’ qitstu(class_t *cls); ^~~~~~~

This error message indicates that there is a syntax error in your code on line 74. The compiler is expecting an expression before the identifier "class_t", but it cannot find one.

It is possible that you have not defined the "class_t" type properly, or that you are trying to use it in a way that is not allowed. Without seeing more of your code, it is difficult to say exactly what the problem is.

To fix this error, you should check your code on or around line 74 and make sure that you are using the "class_t" type correctly. You may also want to review your code for any other syntax errors or missing declarations that could be causing problems.

相关问题

warning: multi-character character constant [-Wmultichar] if(noun[i]=='s' || noun[i]=='x' || noun[i]=='sh' || noun[i]=='ch') ^~~~ src/main.cpp:17:63: warning: multi-character character constant [-Wmultichar] if(noun[i]=='s' || noun[i]=='x' || noun[i]=='sh' || noun[i]=='ch') ^~~~ src/main.cpp: In function ‘void getNounPlural(char*, char*)’: src/main.cpp:15:2: error: expected ‘;’ before ‘}’ token } ^ src/main.cpp:16:9: error: expected primary-expression before ‘char’ strcpy(char *noun, char *plural); ^~~~ src/main.cpp:16:21: error: expected primary-expression before ‘char’ strcpy(char *noun, char *plural); ^~~~ src/main.cpp:20:10: error: expected primary-expression before ‘char’ strcat(char *plural, char *s); ^~~~ src/main.cpp:20:24: error: expected primary-expression before ‘char’ strcat(char *plural, char *s); ^~~~

抱歉，之前的回答中存在错误。这里是修正后的代码：

#include <stdio.h>
#include <string.h>

void getNounPlural(char *noun, char *plural) {
    int len = strlen(noun);
    strcpy(plural, noun);  // 将原始名词复制到复数形式的字符串中
    
    // 判断名词的最后一个字母来决定是否需要加上"es"或"s"
    if (noun[len - 1] == 's' || noun[len - 1] == 'x' || (noun[len - 2] == 's' && noun[len - 1] == 'h') || (noun[len - 2] == 'c' && noun[len - 1] == 'h')) {
        strcat(plural, "es");
    } else {
        strcat(plural, "s");
    }
}

int main() {
    char noun[100];
    char plural[100];
    
    printf("Enter a noun: ");
    scanf("%s", noun);
    
    getNounPlural(noun, plural);
    
    printf("The plural form is: %s\n", plural);
    
    return 0;
}

这段代码定义了一个`getNounPlural`函数，用于将名词转换为复数形式。函数通过判断名词的最后一个字母来决定是否需要加上"es"或"s"来构成复数形式。在`main`函数中，我们输入一个名词，然后调用`getNounPlural`函数，最后输出转换后的复数形式。

希望这次的回答能够帮到您！如果还有其他问题，请随时提问。

test1.cpp: In function ‘int main(int, char**)’: test1.cpp:7:2: error: ‘CvPoint’ was not declared in this scope 7 | CvPoint center; | ^~~~~~~ test1.cpp:10:2: error: ‘IplImage’ was not declared in this scope 10 | IplImage* image = cvLoadImage("luhan.png"); | ^~~~~~~~ test1.cpp:10:12: error: ‘image’ was not declared in this scope 10 | IplImage* image = cvLoadImage("luhan.png"); | ^~~~~ test1.cpp:10:20: error: ‘cvLoadImage’ was not declared in this scope 10 | IplImage* image = cvLoadImage("luhan.png"); | ^~~~~~~~~~~ test1.cpp:13:2: error: ‘cvShowImage’ was not declared in this scope 13 | cvShowImage("Image", image); | ^~~~~~~~~~~ test1.cpp:15:26: error: ‘center’ was not declared in this scope 15 | if (!image) return -1; center = cvPoint(image->width / 2, image->height / 2); | ^~~~~~ test1.cpp:15:35: error: ‘cvPoint’ was not declared in this scope 15 | if (!image) return -1; center = cvPoint(image->width / 2, image->height / 2); | ^~~~~~~ test1.cpp:21:44: error: expected primary-expression before ‘,’ token 21 | uchar* ptr = &CV_IMAGE_ELEM(image, uchar, i, j * 3); | ^ test1.cpp:21:18: error: ‘CV_IMAGE_ELEM’ was not declared in this scope 21 | uchar* ptr = &CV_IMAGE_ELEM(image, uchar, i, j * 3); | ^~~~~~~~~~~~~ test1.cpp:28:8: error: ‘cvarrToMat’ was not declared in this scope 28 | src = cvarrToMat(image); | ^~~~~~~~~~ test1.cpp:31:5: error: ‘cvNamedWindow’ was not declared in this scope 31 | cvNamedWindow("test",1); imshow("test", src); | ^~~~~~~~~~~~~ test1.cpp:32:3: error: ‘cvWaitKey’ was not declared in this scope 32 | cvWaitKey(); | ^~~~~~~~~

这段代码存在一些问题。首先，需要在代码的开头添加以下两行代码来引入所需的头文件：

#include <opencv2/opencv.hpp>
using namespace cv;

其次，代码中的一些函数和变量没有正确声明。您可以将以下几处错误进行修正：

1. 将 `CvPoint` 替换为 `Point`。
2. 将 `IplImage` 替换为 `Mat`。
3. 将 `cvLoadImage` 替换为 `imread`。
4. 将 `cvShowImage` 替换为 `imshow`。
5. 将 `cvarrToMat` 替换为 `cvarrToMat`。

修复后的代码如下所示：

#include <opencv2/opencv.hpp>
using namespace cv;

int main(int argc, char** argv)
{
    Point center;
    Mat image = imread("luhan.png");
    imshow("Image", image);
    
    if (image.empty())
        return -1;
    
    center = Point(image.cols / 2, image.rows / 2);
    
    for (int i = 0; i < image.rows; i++)
    {
        for (int j = 0; j < image.cols; j++)
        {
            uchar* ptr = &image.at<Vec3b>(i, j)[0];
            // 处理像素值
        }
    }
    
    namedWindow("test", 1);
    imshow("test", image);
    waitKey();
    
    return 0;
}

请注意，此代码假设您已经安装了OpenCV并正确配置了环境。如果仍然有错误，请提供更多详细信息，以便我能够帮助您解决问题。