Question

下面代码生成时第一行报错：time找不到标识符是什么意思？谢谢大神

srand((unsigned int)time(0));
//do cycle while error is higher than parameter -e or number of passes parameter -E
while((pass<param.pass)&&(fluctuation>param.error)) {
//nullifying changed values
changed.assign(changed.size(),false);

//cycle for instances
//sample[i] = Ek; sample - all examples

Answer 1

time前加一个空格，开始处加入头文件，#include<time.h>。

Answer 2

你没有把函数库include进来吧
#include <stdio.h>
#include <stdlib.h>//srand()、rand()
#include <time.h>//time();
#include <conio.h>

int main()
{
srand((unsigned)time(NULL));