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r(sh)g2024-07-01 17:22:52 Yϴȫ ҪͶ
  • P(gun)]

ҕУ@ƸPԇ}

1101044Ă(g)(sh)ô24c(din)?

ҕУ@ƸPԇ}

(10*10-4)/4=24

2б_(d)ʽ32λC(j)gh(hun)µֵ()

class A

{

};

class B

{

public:

B();

virtual ~B();

};

class C

{

private:

#pragma pack(4)

int i;

short j;

float k;

char l[64];

long m;

char *p;

#pragma pack()

};

class D

{

private:

#pragma pack(1)

int i;

short j;

float k;

char l[64];

long m;

char *p;

#pragma pack()

};

int main(void)

{

printf("%d\n",sizeof(A));

printf("%d\n",sizeof(B));

printf("%d\n",sizeof(C));

printf("%d\n",sizeof(D));

return 0;

}

class A

{

};

class B

{

public:

B();

virtual ~B();

};

class C

{

private:

#pragma pack(4)

int i;

short j;

float k;

char l[64];

long m;

char *p;

#pragma pack()

};

class D

{

private:

#pragma pack(1)

int i;

short j;

float k;

char l[64];

long m;

char *p;

#pragma pack()

};

int main(void)

{

printf("%d\n",sizeof(A));

printf("%d\n",sizeof(B));

printf("%d\n",sizeof(C));

printf("%d\n",sizeof(D));

return 0;

}A148482 B448284 C448482 D148282

3³32λC(j)\(yn)еĽY(ji)()

#pragma pack(4)

struct info_t

{

unsigned char version;

unsigned char padding;

unsigned char extension;

unsigned char count;

unsigned char marker;

unsigned char payload;

unsigned short sequence;

unsigned int timestamp;

unsigned int ssrc;

};

union info_u

{

unsigned char version;

unsigned char padding;

unsigned char extension;

unsigned char count;

unsigned char marker;

unsigned char payload;

unsigned short sequence;

unsigned int timestamp;

unsigned int ssrc;

};

#pragma pack()

int main(void)

{

printf("%d\n",sizeof(info_t));

printf("%d\n",sizeof(info_u));

return 0;

}

#pragma pack(4)

struct info_t

{

unsigned char version;

unsigned char padding;

unsigned char extension;

unsigned char count;

unsigned char marker;

unsigned char payload;

unsigned short sequence;

unsigned int timestamp;

unsigned int ssrc;

};

union info_u

{

unsigned char version;

unsigned char padding;

unsigned char extension;

unsigned char count;

unsigned char marker;

unsigned char payload;

unsigned short sequence;

unsigned int timestamp;

unsigned int ssrc;

};

#pragma pack()

int main(void)

{

printf("%d\n",sizeof(info_t));

printf("%d\n",sizeof(info_u));

return 0;

}A12 12 B12 4 C16 4 D16 12 E16 1

4±_(d)ʽresultֵ()

#define VAL1(a,b) a*b

#define VAL2(a,b) a/b--

#define VAL3(a,b) ++a%b

int a = 1;

int b = 2;

int c = 3;

int d = 3;

int e = 5;

int result = VAL2(a,b)/VAL1(e,b)+VAL3(c,d);

#define VAL1(a,b) a*b

#define VAL2(a,b) a/b--

#define VAL3(a,b) ++a%b

int a = 1;

int b = 2;

int c = 3;

int d = 3;

int e = 5;

int result = VAL2(a,b)/VAL1(e,b)+VAL3(c,d);A-2 B1 C0 D2

5Ո(qng)³ݔ(5)

void swap_1(int a , int b)

{

int c;

c = a;

a = b;

b = c;

return ;

}

void swap_2(int &a , int &b)

{

int c;

c = a;

a = b;

b = c;

return ;

}

void swap_3(int *a , int *b)

{

int c;

c = *a;

*a = *b;

*b = c;

return ;

}

int main(void)

{

int a = 100;

int b = 200;

swap_1(a , b);

printf("a = %d , b = %d\n",a , b);

swap_2(a , b);

printf("a = %d , b = %d\n",a , b);

swap_3(&a , &b);

printf("a = %d , b = %d\n",a , b);

return 0;

}

void swap_1(int a , int b)

{

int c;

c = a;

a = b;

b = c;

return ;

}

void swap_2(int &a , int &b)

{

int c;

c = a;

a = b;

b = c;

return ;

}

void swap_3(int *a , int *b)

{

int c;

c = *a;

*a = *b;

*b = c;

return ;

}

int main(void)

{

int a = 100;

int b = 200;

swap_1(a , b);

printf("a = %d , b = %d\n",a , b);

swap_2(a , b);

printf("a = %d , b = %d\n",a , b);

swap_3(&a , &b);

printf("a = %d , b = %d\n",a , b);

return 0;

}ݔY(ji)

a = 100 , b = 200

a = 200 , b = 100

a = 100 , b = 200

6ijǷІ}І}Ո(qng)ؘ(gu)a(5)

void test_type(bool b , const char *p , float f)

{

if(!b)

{

return ;

}

else if(!p)

{

return ;

}

else if(!f)

{

return ;

}

}

void test_type(bool b , const char *p , float f)

{

if(!b)

{

return ;

}

else if(!p)

{

return ;

}

else if(!f)

{

return ;

}

}޸£

void test_type(bool b , const char *p , float f)

{

if(!b)

{

return ;

}

else if(!p)

{

return ;

}

else if(f > -1e-10 && f < 1e-10)

{

return ;

}

}

void test_type(bool b , const char *p , float f)

{

if(!b)

{

return ;

}

else if(!p)

{

return ;

}

else if(f > -1e-10 && f < 1e-10)

{

return ;

}

}7Ո(qng)ָ³ʲô}(5)

void test_mem()

{

char *p = new char[64];

delete p;

p = NULL;

return ;

}

void test_mem()

{

char *p = new char[64];

delete p;

p = NULL;

return ;

}(yng)ԓ޸Ğ delete[]p; pָһ(g)ַ͵Ĕ(sh)MgԭĴaֻǺ(jin)εጷָՈ(qng)gָ]ጷՈ(qng)ĿgɃ(ni)

ҕУ@ƸPԇ}

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ҕУ@ƸPԇ}(http://www.oriental01.com)

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