企业官网建设流程全解析

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#include<iostream>

usingnamespacestd;

voidTestFunc(inta = 0)//参数缺省值

{

cout << a << endl;

}

intmain()

{

TestFunc();//没有指定实参，使用缺省值

TestFunc(10);//指定实参，使用实参

return0;

}

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#include<iostream>

usingnamespacestd;

namespaceWD

{

structStack

{

int* a;

intsize;

intcapacity;

};

}

usingnamespaceWD;

voidStackInit(structStack* ps)

{

ps->a = NULL;

ps->capacity = 0;

ps->size = 0;

}

voidStackPush(structStack* ps,intx)

{

if(ps->size == ps->capacity)

{

//ps->capacity *= 2;//err

ps->capacity == 0 ? 4 : ps->capacity * 2;//这里就必须写一个三目

}

}

voidStackInitCpp1(structStack* ps,intdefaultCP)

{

ps->a = (int*)malloc(sizeof(int) * defaultCP);

ps->capacity = 0;

ps->size = defaultCP;

}

voidStackInitCpp2(structStack* ps,intdefaultCP = 4)//ok

{

ps->a = (int*)malloc(sizeof(int) * defaultCP);

ps->capacity = 0;

ps->size = defaultCP;

}

intmain()

{

//假设明确知道这里至少需要100个数据到st1

structStack st1;

StackInitCpp1(&st1, 100);

//假设不知道st2里需要多少个数据 ———— 希望开小点

structStack st2;

StackInitCpp2(&st1);//缺省

return0;

}

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voidTestFunc(inta = 10,intb = 20,intc = 30)

{

cout <<"a = "<< a << endl;

cout <<"b = "<< b << endl;

cout <<"c = "<< c << endl;

cout << endl;

}

intmain()

{

//非常灵活，

TestFunc();

TestFunc(1);

TestFunc(1, 2);

TestFunc(1, 2, 3);

//TestFunc(1, , 3);//err，注意它没办法实现b不传，只传a和b，也就是说编译器只能按照顺序传

return0;

}

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//void TestFunc(int a, int b = 10, /*int f, - err*/ int c = 20);//err，void TestFunc(int a, int b = 10, /*int f, int x = y, -> err*/ int c = 20){cout << "a = " << a << endl;cout << "b = " << b << endl;cout << "c = " << c << endl;cout << endl;}int main(){//TestFunc();//err，至少得传一个，这是根据形参有几个非半缺省参数确定的TestFunc(1);TestFunc(1, 2);TestFunc(1, 2, 3);return 0;}//void TestFunc(int a, int b = 10, /*int f, - err*/ int c = 20);//err，

voidTestFunc(inta,intb = 10,/*int f, int x = y, -> err*/intc = 20)

{

cout <<"a = "<< a << endl;

cout <<"b = "<< b << endl;

cout <<"c = "<< c << endl;

cout << endl;

}

intmain()

{

//TestFunc();//err，至少得传一个，这是根据形参有几个非半缺省参数确定的

TestFunc(1);

TestFunc(1, 2);

TestFunc(1, 2, 3);

return0;

}

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//a.hvoid TestFunc(int a = 10);//a.cppvoid TestFunc(int a = 20){}