\u4e00\u3001\u7b26\u53f7\u5e38\u91cf\u7684\u58f0\u660e<\/p>
\u3000\u3000\u3000\u3000\u5e38\u91cf\u58f0\u660e\u7684\u8bed\u53e5\u7684\u5f62\u5f0f\uff1a\u3000\u3000const + \u6570\u636e\u7c7b\u578b\u8bf4\u660e\u7b26 + \u5e38\u91cf\u540d = \u5e38\u91cf\u503c<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000 \u6570\u636e\u7c7b\u578b\u8bf4\u660e\u7b26 + const + \u5e38\u91cf\u540d = \u5e38\u91cf\u503c \u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u6ce8\u610f\uff1a \u3000\u3000\u7b26\u53f7\u5e38\u91cf\u5728\u58f0\u660e\u65f6\u4e00\u5b9a\u8981\u8d4b\u521d\u503c\uff0c\u4e14\u5728\u7a0b\u5e8f\u4e2d\u4e0d\u80fd\u6539\u53d8\u5176\u503c\u3002\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000const float PI = 3.14159; \u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\/\/\u4e0b\u9762\u5219\u662f\u9519\u8bef\u7684\u58f0\u660e \u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000const float PI; \u3000\u3000\u3000\u3000 \u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000PI = 3.14159;<\/p>
\u4e8c\u3001const* \u548c *const \u7684\u533a\u5206<\/p>
\u3000\u3000\u3000\u3000\u76ee\u524d\u4e86\u89e3\u7684\u5f62\u5f0f<\/p>
\u3000\u3000\u3000\u3000\u4f8b\u5982\uff1a\u3000const int *p (int const *p)<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000int *const p<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000const int* const p<\/p>
\u3000\u3000\u3000\u30001.const int *p (int const *p) \u7684\u610f\u4e49<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u4e8c\u8005\u8868\u8fbe\u7684\u610f\u601d\u4e00\u81f4\uff0c\u5373 *p \u662f\u4e2a const \uff0c\u4e0d\u80fd\u901a\u8fc7 *p \u4fee\u6539 p \u7684\u6307\u5411\uff0c\u6240\u4ee5\u4e5f\u53ef\u4ee5\u53eb\u5b83\u4e3a\u53ea\u8bfb\u578b\u6307\u9488<\/p>
\u7531\u4e8e\u662f\u5c06\u6307\u5411\u7684\u6570\u636e\u89c6\u4e3a\u5e38\u91cf\uff0c\u5b9a\u4e49\u7684\u65f6\u5019\u53ef\u4ee5\u4e0d\u7528\u521d\u59cb\u5316<\/p>
<\/p>
1.\u3000\u3000 int a = 0; \u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000const int* p; \u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000p = &a; \u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000*p = 2; \/\/\u9519\u8bef\uff0c\u4e0d\u80fd\u901a\u8fc7*p \u4fee\u6539\u503c \u3000\u3000<\/p>
\u3000\u3000 2.\u3000\u3000 int a = 0; \u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000 const int* p = &a; \u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000 a = 1; \u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000 cout<< *p << endl; \/\/\u6b64\u65f6p\u6307\u5411\u7684\u503c\u53ef\u4ee5\u6539\u53d8,\u6253\u5370\u51fa\u6765\u4e3a 1 \u3000\u3000<\/p>
\u3000 3.\u3000 int a= 0,b = 1; \u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000\u3000const int* p = &a; \u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000 cout<< *p << endl; \/\/*p \u503c\u4e3a 0 \u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000 p = &b; \u3000\u3000\u3000\u3000\u3000<\/p>
\u3000\u3000\u3000\u3000\u3000cout << *p << endl; \/\/*p \u503c\u4e3a 1<\/p>
<\/p>
\u3000\u3000\u3000\u30002. int* const p \u7684\u610f\u4e49<\/p>
\u3000\u3000\u3000\u3000\u3000\u3000\u8be5\u5b9a\u4e49\u5c06 p \u89c6\u4e3a\u4e00\u4e2aconst\u5e38\u91cf\uff0c\u6240\u4ee5\u5b9a\u4e49\u65f6\u5c31\u8981\u521d\u59cb\u5316\uff0c\u4e14p \u6307\u5411\u7684\u4f4d\u7f6e\u4e0d\u80fd\u6539\u53d8\uff0c\u6240\u4ee5\u4e5f\u53ef\u4ee5\u53eb\u5b83\u6307\u9488\u5e38\u91cf<\/p>
<\/p>
1. int a = 0,b =1;
int* const p = &a;
p = &b; \/\/\u9519\u8bef\uff0cp \u7684\u6307\u5411\u5df2\u4e0d\u80fd\u6539\u53d8
<\/p>
2. int a = 0, b = 1;
int* const p = &a;
*p = b;
cout << *p << endl; \/\/*p \u4e3a 1<\/p>
<\/p>
3. int a = 0, b = 1;
int*const p = &a;
a = b;
cout << *p << endl; \/\/*p \u4e3a 1<\/p>
<\/p>
\uff08const int* p \u4e0e int* const p \u4e0e const int* const p \u7684\u533a\u522b\uff09<\/p>
\u3000\u3000const int* p \u8868\u793a\u628a p \u6307\u5411\u7684\u53d8\u91cf\u770b\u6210\u5e38\u91cf<\/p>
\u3000\u3000int* const p \u8868\u793a\u628a p \u81ea\u5df1\u5b9a\u4e49\u4e3a\u5e38\u91cf\uff0c\u6240\u4ee5\u5b9a\u4e49\u65f6\u5c31\u8981\u521d\u59cb\u5316<\/p>
\u3000\u3000const int* const p \u8868\u793a p\u3001*p \u90fd\u662f\u5e38\u91cf\uff0c\u5373 p \u7684\u6307\u5411\u4e0d\u80fd\u6539\u53d8\uff0c\u4e5f\u4e0d\u80fd\u901a\u8fc7 *p \u6539\u53d8 p \u6307\u5411\u7684\u503c<\/p>
\u3000\u3000\u6709\u4e2a\u8bc4\u8bba\u8bb2\u7684\u5f88\u6709\u610f\u601d\uff0cshare\u4e00\u4e0b\uff1a<\/p>
\u770b"effective c++"\u7b2c\u4e09\u6761\u8bb2\u5230\uff1a
\u53ea\u9700\u8981\u5224\u65adconst\u662f\u5728 * \u7684\u5de6\u8fb9\u8fd8\u662f\u53f3\u8fb9\u5373\u53ef\u3002
\u5de6\u8fb9\u5219\u662f\u4fee\u9970\u88ab\u6307\u7269\uff0c\u5373\u88ab\u6307\u7269\u662f\u5e38\u91cf\uff0c\u4e0d\u53ef\u4ee5\u4fee\u6539\u5b83\u7684\u503c\uff1b
\u53f3\u8fb9\u5219\u662f\u4fee\u9970\u6307\u9488\uff0c\u5373\u6307\u9488\u662f\u5e38\u91cf\uff0c\u4e0d\u53ef\u4ee5\u4fee\u6539\u5b83\u7684\u6307\u5411\uff1b
\u5728\u5de6\u53f3\u4e24\u8fb9\uff0c\u5219\u88ab\u6307\u7269\u548c\u6307\u9488\u90fd\u662f\u5e38\u91cf\uff0c\u90fd\u4e0d\u53ef\u4ee5\u4fee\u6539\u3002
int c = 3;
int a = 2;
int b = 1;
\/\/const\u51fa\u73b0\u5728*\u5de6\u8fb9\uff0c\u5219\u88ab\u6307\u7269\u662f\u5e38\u91cf
const int * pi = &a;
*pi = b;\/\/\u4e0d\u6b63\u786e \u88ab\u6307\u7269\u662f\u5e38\u91cf
pi = &c; \/\/\u6b63\u786e
\/\/const \u51fa\u73b0\u5728* \u53f3\u8fb9\uff0c\u5219\u6307\u9488\u662f\u5e38\u91cf
int * const p = &a;
p = &c;\/\/\u4e0d\u6b63\u786e\uff0c\u6307\u9488\u662f\u5e38\u91cf
*p = c;\/\/\u6b63\u786e
\/\/const\u51fa\u73b0\u5728*\u5de6\u53f3\u4e24\u8fb9\uff0c\u5219\u88ab\u6307\u7269\u548c\u6307\u9488\u90fd\u662f\u5e38\u91cf
const int * const ptr = &a;
ptr = &c;\/\/\u4e0d\u6b63\u786e\uff0c\u6307\u9488\u662f\u5e38\u91cf
*ptr = c;\/\/\u4e0d\u6b63\u786e\uff0c\u88ab\u6307\u7269\u662f\u5e38\u91cf<\/p>
\u6ce8\u610f\u4e8b\u9879 \uff01<\/strong><\/p> 1.\u5982\u679c\u6709const int a = 0; \u90a3\u4e48\u5fc5\u987b\u662f const int* \u624d\u80fd\u6307\u5411 a,\u50cf int* p =&a; \u662f\u975e\u6cd5\u7684<\/p> 2.const int a =10;<\/p> int* p =&a; \/\/ \u9519\u8bef\uff0c\u8fd9\u662f\u4e0d\u80fd\u53d6\u5730\u5740\u7684\uff0c\u5426\u5219\u6709\u4fee\u6539\u503c\u7684\u80fd\u529b<\/p> \u4ee5\u4e0a\u4e3a\u73b0\u9636\u6bb5\u7684\u5b66\u4e60\u8bb0\u5f55\uff0c\u5982\u6709\u9519\u8bef\u5e0c\u671b\u6307\u6b63 \uff1a\uff09<\/p>