小编Joh*_*ohn的帖子

我有两个课程,包括课程和课程.它们都在同一个包和同一目录中.

Offering.java:

package assignment02;

public class Offering implements Comparable<Offering> {
    private Course course;
    private int CRN;
    private int semester;

    public Offering(Course course, int CRN, int semester) {
        this.course = course;
        this.CRN = CRN;
        this.semester = semester;
    }

    public int getNumCredits() {
        return course.getNumCredits;
    }

    public int getCRN() {
        return CRN;
    }

    public int getSemester() {
        return semester;
    }

    public int compareTo(Offering other) {
        if(other == null) return - 1;
        return semester - other.semester;
    }
}

Course.java:

package assignment02;

public class …

cygwin可以使用gettimeofday()吗？我收到错误:

lab8.cpp: In function ‘int main()’:
lab8.cpp:62:30: error: ‘gettimeofday’ was not declared in this scope
     gettimeofday(&start, NULL);
                              ^
makefile:14: recipe for target 'lab8.o' failed
make: *** [lab8.o] Error 1

我肯定包括在内<sys/time.h>.是否有我必须安装的软件包,或者它是否在Windows上无法运行？

编辑:这是一个产生相同错误的简单测试:

#include <sys/time.h>

int main() {
    struct timeval start;

    gettimeofday(&start, NULL);
}

有错误:

$ g++ -c -Wall -g -std=c++11 test.cpp -o test.o
test.cpp: In function ‘int main()’:
test.cpp:6:30: error: ‘gettimeofday’ was not declared in this scope
     gettimeofday(&start, NULL);