c - 正确使用 malloc()

Question

我在用 C 编写代码时使用 malloc，但我得到了

[Warning] conflicting types for built-in function 'malloc'

编译时出现这个警告。

这是我使用的代码:

starttimer(AorB,increment)
int AorB;  /* A or B is trying to stop timer */
float increment;
{

 struct event *q;
 struct event *evptr;
 char *malloc();

 if (TRACE>2)
    printf("          START TIMER: starting timer at %f\n",time);
 /* be nice: check to see if timer is already started, if so, then  warn */
/* for (q=evlist; q!=NULL && q->next!=NULL; q = q->next)  */
   for (q=evlist; q!=NULL ; q = q->next)  
    if ( (q->evtype==TIMER_INTERRUPT  && q->eventity==AorB) ) { 
      printf("Warning: attempt to start a timer that is already started\n");
      return;
      }

/* create future event for when timer goes off */
   evptr = (struct event *)malloc(sizeof(struct event));
   evptr->evtime =  time + increment;
   evptr->evtype =  TIMER_INTERRUPT;
   evptr->eventity = AorB;
   insertevent(evptr);
} 

提前致谢。

Answer 1

您需要 #include <stdlib.h> ，并删除您的虚假声明:char *malloc();

此外，您需要找到更新的 C 引用!K&R 函数声明语法已经过时很长时间了。

考虑改变:

starttimer(AorB,increment)
int AorB;  /* A or B is trying to stop timer */
float increment;
{

(看起来很正常的)ANSI C 标准:

int starttimer(int AorB, float increment) {