5.文件操作

    int i;
    FILE* file;
    if ((file = fopen ("D:\\q.txt","w+" )) == NULL)//打开操作不成功
    {
            printf("The file can not be opened.\n");
            exit(1);//结束程序的执行
    }
    printf("The result are as follows：\n");
    for (i = 0; i < 4410; i++)
    {
        printf("%lf", y[i].real);
        //if (y[i].img >= 0.0001)printf("+%lfj\n", y[i].img);
        //else if (fabs(y[i].img) < 0.0001)printf("\n");
        //else printf("%lfj\n", y[i].img);
        fprintf(file, "%f,", y[i].real);
    }
    fclose(file);