编译器错误 - 可能的IDE错误“未定义的gettimeofday错误引用” [英] Compiler error-Possible IDE error"undefined reference to gettimeofday error"

问题描述

我试图使用rand，srand和时间生成随机（足够的）数字在CI使用DEVC ++。我得到以下错误：
[链接错误]未定义的引用gettimeofday错误

这是我的代码：

  #include< stdlib.h> 
 #include< stdio.h> 
 #include< string.h> 
 #include< time.h> 
 #include< sys / time.h> 
 
 static unsigned long next = 1; 
 
 int myrand（void）{
 next = next * 1103515245 + 12345; 
 return（（unsigned）（next / 65536）％32768）; 
} 
 
 void mysrand（unsigned seed）{
 next = seed; 
} 
 
 struct {
 long tv_sec; 
 long tv_usec; 
} timeval; 
 
 int main（）{
 
 
 int num = 0; // random number 
 
 struct timeval t1; 
 
 
 gettimeofday（& t1，NULL）; 
 srand（t1.tv_usec * t1.tv_sec）; 
 
 arg_num = rand（）; 
 
 printf（参数个数：％d \\\
，arg_num）; 
 
} 
  

在线调查我发现DEVC ++包括GNU编译器，但它并没有真正使用它，导致不能识别所有的通用函数。
除了解决链接的错误，我想知道是否有一个IDE的C编程在Windows中使用GNU或不会产生这样的问题..

解决方案

Windows没有gettimeofday（）。

I am trying to use rand,srand and time to generate random(enough) numbers in C.I use DEVC++.I get the following error: [Linked Error]undefined reference to 'gettimeofday' error

Here is my code:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>

static unsigned long next = 1;

    int myrand(void) {
next = next * 1103515245 + 12345;
return((unsigned)(next/65536) % 32768);
}

void mysrand(unsigned seed) {
next = seed;
}

struct  {
   long tv_sec;
   long tv_usec;
       }timeval ;

int main(){


int num=0;               //random number

struct timeval t1;  


gettimeofday(&t1, NULL);
srand(t1.tv_usec * t1.tv_sec);

arg_num=rand();

printf("Number of arguments is:%d\n",arg_num);

}

Making an online research i found out that DEVC++ (somehow) includes GNU compiler but it doesn't really use it and that results in not identifying all "common" functions. Beyond solving the linked error, i would like to know if there is an IDE for C programming in Windows that uses GNU or that will not making such problems..

解决方案

There is no gettimeofday() provided by Windows.

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