83 lines
1.9 KiB
C++
83 lines
1.9 KiB
C++
#include <cstring>
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#include <iostream>
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#include <stdio.h>
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#include <string>
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using namespace std;
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///===========================================
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/**
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* (#)字符串操作符
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*/
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///===========================================
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#define exp(s) printf("test s is:%s\n", s)
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#define exp1(s) printf("test s is:%s\n", #s)
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#define exp2(s) #s
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///===========================================
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/**
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*（##）符号连接操作符
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*/
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///===========================================
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#define expA(s) printf("前缀加上后的字符串为:%s\n", gc_##s) // gc_s必须存在
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#define expB(s) printf("前缀加上后的字符串为:%s\n", gc_##s) // gc_s必须存在
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#define gc_hello1 "I am gc_hello1"
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///===========================================
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/**
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* (\)续行操作符
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*/
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///===========================================
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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int main() {
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///===========================================
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/**
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* (#)字符串操作符
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*/
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///===========================================
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exp("hello");
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exp1(hello);
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string str = exp2(bac);
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cout << str << " " << str.size() << endl;
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/**
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* 忽略传入参数名前面和后面的空格。
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*/
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string str1 = exp2(asda bac);
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/**
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* 当传入参数名间存在空格时，编译器将会自动连接各个子字符串，
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* 用每个子字符串之间以一个空格连接，忽略剩余空格。
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*/
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cout << str1 << " " << str1.size() << endl;
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///===========================================
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/**
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* (#)字符串操作符
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*/
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///===========================================
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const char *gc_hello = "I am gc_hello";
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expA(hello);
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expB(hello1);
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char var1_p[20];
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char var2_p[20];
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// 连接后的实际参数名赋值
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strcpy(var1_p, "aaaa");
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strcpy(var2_p, "bbbb");
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///===========================================
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/**
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* (\)续行操作符
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*/
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///===========================================
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int max_val = MAX(3, 6);
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cout << max_val << endl;
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return 0;
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}
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