c語(yǔ)言常見(jiàn)筆試題總結(jié)

1、c語(yǔ)言常見(jiàn)筆試題總結(jié)【1使用宏】1.1#ifdef NDEBUG#define TRACE(S) S#else#define TRACE(S) printf( n'" %#S); S#endif問(wèn)：以上TRACE()宏的作用是什么？1.2 #error 的作用？1.3 定義一個(gè)宏，求生給定數(shù)組中的元素的個(gè)數(shù)#define NELEMENTS(array) ?1.4 定義一個(gè)宏，求生給定結(jié)構(gòu)中給定成員的偏移量#define OFFSET(structure, member) ?【2數(shù)據(jù)聲明和定義】給定以下類型的變量a的定義式：a) An integerb) A pointer

2、to an integerc) A pointer to a pointer to an integerd) An array of 10 integerse) An array of 10 pointers to integersf) A pointer to an array of 10 integersg) A pointer to a function that takes an integer as an argument and returns an integerh) An array of ten pointers to functions that take an integ

3、er argument and return an integer【3復(fù)雜類型(1)】有如下表達(dá)式：char (*(*x()();請(qǐng)用文字描述x是什么?！?復(fù)雜類型(2)1jmp_buf的定義:typedef struct _jmp_buf(REG_SET reg;int extra3; jmp_buf1;setjmp函數(shù)的原型：extern int setjmp (jmp_buf _env);問(wèn)：調(diào)用setjmp時(shí)傳遞env的內(nèi)容，還是傳遞指針?【5頭文件】問(wèn)：為什么標(biāo)準(zhǔn)頭文件都有類似以下的結(jié)構(gòu)?#ifndef _INCvxWorksh#define INCvxWorksh#ifdef _c

4、plusplusextern" C” #endif/* */#ifdef _cplusplus#endif#endif /* INCvxWorksh */請(qǐng)說(shuō)由static關(guān)鍵字的3種用處:(1)用于全局變量;(2)用于局部變量;(3)用于函數(shù)。/* file.c */static int a;int b;static int fn()(static int x;int y;【7 const關(guān)鍵字】7.1 const關(guān)鍵字的意義是什么?7.2 解釋以下的變量定義：const int a1;int const a2;const int *a3;int * const a4;int co

5、nst * const a5;【8 volatile關(guān)鍵字】8.1 volatile意義？例如 volatile int *p;8.2 volatile能和const一起使用嗎？例如volatile const int *p;【9 sizeof()有以下定義：char *pmsg =" A ；char msg口 =“A” ；char ch = ' A'問(wèn)：sizeof(pmsg) = ?sizeof(msg) = ?sizeof( " A ) = ?sizeof(ch) = ?sizeof( 'A' ) = ?(在 C+中等于多少？) voi

6、d f(char param100)/ sizeof(param) = ?【10字符串】有以下代碼char *pmsg =hello, world!strcpy(pmsg,hi, there.);試評(píng)論該代碼?！?1混合運(yùn)算】有以下代碼：void foo()(unsigned int a = 6;int b = -20;(a+b > 6) ? puts( " > 6 ) : puts( " < = 6 );請(qǐng)問(wèn)調(diào)用foo()的輸由?【12內(nèi)存訪問(wèn)】有以下代碼：void fn()(int a100;int *p;p = (int *)(unsigned int)a + 1);printf("p=0x%nX，, *p);試評(píng)論以上代碼【13 C庫(kù)函數(shù)】請(qǐng)說(shuō)明以下函數(shù)的意義：v