<The C programming language> 5.11 函数指针 “函数名称就是函数的地址？”

2019-11-08 02:28:09

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qsort1((void **) lineptr, 0, nlines - 1, (int (*)(void *, void *))(numeric ? numcmp : strcmp));
Wedit output window build: Sun Feb 19 10:26:10 2017Error h:/c_workcarbin/mytest.c: 26  Operands of ?: have illegal types 'pointer to int function(pointer to char,pointer to char)' and 'pointer to int function(pointer to char,pointer to char)'Compilation + link time:0.0 sec, Return code: 1
编译环境：LCC-WIN32
（1）按如下定义后，用fun1,fun2去替换numcmp,strcmp可以编译通过。
//	int (*fun1)(void *,void*) = (int (*)(void *, void *)) &numcmp;//	int (*fun2)(void *,void*) = (int (*)(void *, void *)) &strcmp;（2）或者，将强制类型转换分别对numcmp,strcmp做一遍，也可以通过编译。
qsort1((void **) lineptr, 0, nlines - 1, (int (*)(void *, void *))(numeric ? (int (*)(void *, void *))numcmp : (int (*)(void *, void *))strcmp));