#include #include #include void *testThread(void *arg){ printf("This is a thread test\n"); return NULL; } int main(){ pthread_t tid; int ret; ret = pthread_create(&tid,NULL,testThread,NULL); printf("This is a main thread\n"); return 0; } 我把这段代码编译为名为a.out的程序，然后又写了一个shell脚本，shell脚本的功能是无限运行程序，然后等2秒后，我停止运行shell脚本，然后我发现在某次运行a.out时，"This is a thread test\n"被运行了两次，我就有一点疑惑，按理来说，如果testThread有机会运行的话，最多只打印一次"This is a thread test\n",结果就只打印了两次，我就想弄明白，为什么"This is a thread test\n"会被打印两次。 shlle脚本的内容如下 !/bin/bash while((1)) do echo "-------------------"; ./a.out echo "--------------------"; done 运行的结果如下: "https://wmprod.oss-cn-shanghai.aliyuncs.com/community/1724816041533_sgcK.png" (https://wmprod.oss-cn-shanghai.aliyuncs.com/community/1724816041533_sgcK.png)

类 Demo 里声明了一个虚函数，为什么调用虚函数时core 了呢？ core 信息： Program terminated with signal SIGSEGV, Segmentation fault. #0 0x0000aab1a12ab in vtable for __cxxabiv1::__si_class_type_info () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 class Demo { public: virtual int32_t Demo() { return 0; } }; int main() { Demo* d = new Demo(); d->show(); // core 到这里了 return 0; }

需求：编制C/C++程序，利用顺序存储方式实现下列功能：从键盘输入数据建立一个线性表（整数），并输出该线性表；然后根据屏幕提示，进行数据的插入或删除等操作，并在插入或删除数据后输出线性表。 代码出现问题，无法运行，错误提醒是delete那块红了，估计是它出问题。 未知是什么原因，望指教。 typedef struct { int data[MAX_SIZE]; int length; } SeqList; void init(SeqList *list) { list->length = 0; } void insert(SeqList *list, int position, int value) { if (position list->length || list->length == MAX_SIZE) { printf("The insert position is invalid or the linear table is full:\n"); return; } for (int i = list->length - 1; i >= position; i--) { list->data[i + 1] = list->data[i]; } list->data[position] = value; list->length++; } void delete(SeqList *list, int position) { if (position = list->length) { printf("Invalid delete location:\n"); return; } for (int i = position; i length - 1; i++) { list->data[i] = list->data[i + 1]; } list->length--; } void print(SeqList *list) { printf("Linear table contents:"); for (int i = 0; i length; i++) { printf("%d ", list->data[i]); } printf("\n"); } int main() { SeqList list; init(&list); printf("Please enter the length of the linear table:"); scanf("%d", &list.length); if (list.length > MAX_SIZE) { printf("The linear table length exceeds the maximum value:\n"); return 0; } printf("Enter the elements of the linear table:"); for (int i = 0; i < list.length; i++) { scanf("%d", &list.data[i]); } print(&list); int operation, position, value; printf("\nplese select:\n"); printf("1. insect the data:\n"); printf("2. delete the data\n"); printf("0. exit\n"); while (1) { printf("\nplease enter the ops:"); scanf("%d", &operation); if (operation == 1) { printf("Please enter insert position and insert value (separated by space)："); scanf("%d %d", &position, &value); insert(&list, position, value); } else if (operation == 2) { printf("Please enter the deletion location:"); scanf("%d", &position); delete(&list, position); } else if (operation == 0) { break; } else { printf("Invalid operation number:\n"); } print(&list); } return 0; } 顺便提问一句我的DEVC++底下变成这样，应该怎么恢复到初始可以看见报错原因的状态？ "https://wmprod.oss-cn-shanghai.aliyuncs.com/community/1724815714812_7GjD.png" (https://wmprod.oss-cn-shanghai.aliyuncs.com/community/1724815714812_7GjD.png) 菜鸟上路，万分感谢指教。

这是调用代码,windows平台的. unsigned* fun(const char *path) { unsigned *result=new unsigned[75]; int l=strlen(path); char * pp=new char[l]; for(int i=0;i

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请教一下c语言数组问题？是什么问题导致程序一会能行一会不行？

需求：实现将数组中所有元素调整为左右两部分，左边为奇数，右边为偶数。（c语言） int main(){ int size; printf("enter the size of arr:"); scanf("%d",&size); int arr[size]; for(int i;i

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C++可变参数输出结果错误？

如下代码为什么输出的结果不是1,2,3,4? 而是输出了错误的结果：1803629872 77304476 1803629872 0 #include #include // 函数：打印可变参数的值 void printValues(int count, ...) { va_list args; va_start(args, count); for (int i = 0; i < count; ++i) { int value = va_arg(args, int); std::cout << value << " "; } va_end(args); } // 函数：将可变参数传递给另一个带有可变参数的函数 void processValues(int count, ...) { va_list args; va_start(args, count); printValues(count, args); va_end(args); }

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