函数名，函数名取地址，函数名取值之间的区别

#include <stdio.h>typedef void (*cfp_t)(int a);cfp_t calls_table[3]={NULL,};void test(int a){    printf("test();\n");}int main(void){    printf("************0**********\n");    printf("test：%d\n",test);    printf("&test：%d\n",&test);    printf("*test：%d\n",*test);        printf("************1**********\n");    calls_table[0]=test;    calls_table[0](5);    printf("main();\n");    printf("************2**********\n");    calls_table[0]=&test;    calls_table[0](5);    printf("main();\n");     printf("************3**********\n");    calls_table[0]=*test;    calls_table[0](5);    printf("main();\n");    printf("************4**********\n");    calls_table[0]=test;    (*calls_table[0])(5);    printf("main();\n");    printf("************5**********\n");    calls_table[0]=&test;    (*calls_table[0])(5);//执行    printf("main();\n");    printf("************6**********\n");    (&test)(5);    printf("************7**********\n");    (*test)(5);}

输出结果：

************0**********
test：4195709
&test：4195709
*test：4195709
************1**********
test();
main();
************2**********
test();
main();
************3**********
test();
main();
************4**********
test();
main();
************5**********
test();
main();
************6**********
test();
************7**********
test();

/usercode/file.cpp: In function ‘int main()’:
/usercode/file.cpp:16:30: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘void (*)(int)’ [-Wformat=]
     printf("test：%d\n",test);
                              ^
/usercode/file.cpp:17:32: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘void (*)(int)’ [-Wformat=]
     printf("&test：%d\n",&test);
                                ^
/usercode/file.cpp:18:32: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘void (*)(int)’ [-Wformat=]
     printf("*test：%d\n",*test);
                                ^

由输出结果：可知，函数名，函数名取地址，函数名取值之间可以随意替换。不像数组名，数组名取地址，数组名取值那样区别很大。