¶不要再忘記的function pointer

原文連結: https://darkblack01.blogspot.com/2014/12/function-pointer.html
移植時的最後更新日期: 2015-12-23T14:16:57.636+08:00

先貼上一段程式碼(參考自K&R2 Ch5.11)

#include <stdio.h>
  
typedef int (returnInt)(void, void*);
  
struct A
{
    returnInt comp;   
};

int numcmp(char* s1, char* s2)
{
    double v1, v2;

    v1 = atof(s1);
    v2 = atof(s2);

    if (v1 < v2)
        return -1;
    else
        return 0;
}

int main()
{
    struct A a;
    a.comp = numcmp;

    int o = a.comp(“6”, “5”);
    printf("%d", o);

    return 0;
}

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