AI代码解释 // zero_length_array.c#include<stdio.h>#include<stdlib.h>#defineMAX_LENGTH1024#defineCURR_LENGTH512// 0长度数组struct zero_buffer{int len;char data[0];}__attribute((packed));// 定长数组struct max_buffer{int len;char data[MAX_LENGTH];}__attribute((packed));// 指针数组struct...
#include<stdio.h>#defineMAX(a,b)(((a)>(b))?(a):(b))intmax(int a,int b){if(a>b)returna;elsereturnb;}intmain(void){float a,b,c;a=1.5;b=4.7;c=MAX(a,b);// 展开后:c = (((a)>(b)) ? (a) : (b));printf("c = %d.\n",c);c=max(a,b);// 无法展开,只能调...
#define Variable_Macro(...,a) printf(__VA_ARGS__) int main(void) { Variable_Macro("This is a variable macro test...\n"); Variable_Macro("My age is %d",22); return 0; } 1. 2. 3. 4. 5. 6. 7. 8. 演示结果: root@ubuntu-virtual-machine:/home/ubuntu# gcc b.c b.c:2:...
*/#include<stdio.h>#include<stdarg.h>#defineuint8_t unsigned char#defineuint16_t unsigned short#defineuint32_t unsigned intintMax(int,int);//函数声明intmain(void){int(*p_Max)(int,int);//定义一个函数指针inta, b, c; p_Max = &Max;//把函数Max赋给指针变量p, 使p指向Max函数printf("...
va 就是variable argument(可变参数)的意思 arg_ptr 是指向可变参数表的指针 prev_param 则指可变参数表的前一个固定参数 type 为可变参数的类型 va_list 也是一个宏 其定义为typedef char * va_list 实质上是一char 型指针。 char 型指针的特点是++、--操作对其作用的结果是增1 和减1(因为sizeof(char)为...
(__builtin_alignof(mode)<=4?-4:-8))+sizeof(mode)))[-1] 其作用为指取出当前arg_ptr 所指的可变参数并将ap 指针指向下一可变参数。 va_end宏定义用来结束可变参数的获取,定义为: #defineva_end(list) va_end ( list )实际上被定义为空,没有任何真实对应的代码,用于代码对称,与va_start对应; 可...
#define TRUE 1 #define FALSE 0 int IsInHeap(void* ptr) { int tmpVar; if (ptr < &tmpVar) { return TRUE; } else{ return FALSE; } } int main(void) { int li_A = 0; if ( IsInHeap(&li_A) ) { printf("Temp Variable is in the Heap --> %x \n" , &li_A ) ; ...
8、error C2008: 'xxx' : unexpected in macro definition 中文对照:(编译错误)宏定义时出现了意外的xxx 分析:宏定义时宏名与替换串之间应有空格,例如“#define TRUE"1"” 9、error C2009: reuse of macro formal 'identifier' 中文对照:(编译错误)带参宏的形式参数重复使用 分析:宏定义如有参数不能重名,例...
';std::stringletters{"ABCDEFGHIJKLMNOPQRSTUVWXYZ"};for(constchar& c : letters) {if('Q'== c) {std::cout<<"Found Q!"<<std::endl; }// last = c;}std::cout<<"Last letter was "<< c <<std::endl;// C2065// Fix by using a variable declared in an outer scope.// Uncomment ...
#ifndefUNITY_OUTPUT_CHAR/* Default to using putchar, which is defined in stdio.h */#include< stdio.h >#defineUNITY_OUTPUT_CHAR(a) (void)putchar(a)#else/* If defined as something else, make sure we declare it here so it's ready for use */#ifdefUNITY_OUTPUT_CHAR_HEADER_DECLARATION...