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@Las Vegas

It seems that you are an expert in C++, could you please help me? Just some simple questions.Thank you!

lynx(jane)
本文发表在 rolia.net 枫下论坛I installed VC++6.0 this morning and tried the program. But it still had some problems:
1, I want to know a function that can read the current time of the system, and how to use it. Is it read the seconds or the minutes?In C, it is called biostime().
2, I built the .exe file and I ran it. The program first just read some parameters as you input them, and also the .dat file name. Please see below:

1 printf(" Please input learning factor---Et & dEt: (
Note:0.1>=Et>=0) \n");
2 scanf("%f",&Et);
3 scanf("%f",&dEt);

4 printf(" Please slope value of g() --- alfa:\n");
5 scanf("%f",&alfa);
6 printf(" Please input learning factor---beita:\n");
7 scanf("%f",&beita);
8 printf(" Please input learning factor---bstep:\n");
9 printf(" ( Note: 0.1beita>bstep>0.000 ) \n");
10 scanf("%f",&bstep);

11 gets(ldfnm);
12 printf(" Please input learning data file name(iol?.dat):\n");
13 gets(ldfnm);

14 sss=fopen(ldfnm,"r");
15 fscanf(sss,"%d%d",&inputN1,&inputN1);
16 fscanf(sss,"%d",&modelN);
17 outputN=62;
18 position=ftell(sss);
19 p=position;
20 fclose(sss);

So the above part works until line 13, I can input all those parameters. But when I input the .dat file name (line 12 stll works), it stop working. A window jump out and said that
"Debug assertion failure.
Program: D:\program\Debug\learning.exe
File: fscanf.c
Line: 54
expression: streams!=NULL"

Could you please tell what's wrong with the program? What means assertion failure?How to deal with it?
Thank you very much!更多精彩文章及讨论，请光临枫下论坛 rolia.net
(#142238@0)
Last Updated: 2001-7-23
This post has been archived. It cannot be replied.
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Replies, comments and Discussions:

  • 工作学习 / IT技术讨论 / (C++)How to get object from vector one by one in a loop? thanks. After I erase an element from a list,where the pointer will point to? -wendywendy(wind); 2001-7-22 (#140905@0)
    • 再详细点，第二个问题pointer是指哪一个？ -rock_jack(The Door); 2001-7-22 (#140951@0)
    • template -jfhuang(Zigzag); 2001-7-22 {324} (#141106@0)
      use iterator:
      vector<object>::iterator aIterator;

      for (aIterator = aVector.begin();aIterator != aVector.end();aIterator++){
      // loop
      }

      the statement to remove an element from a vector is:
      aIterator2 = aVector.erase(aIterator1);
      aIterator2 is an iterator which desigates the next available element.
      • in my interview, a question is :what's wrong -wendywendy(wind); 2001-7-23 {238} (#141715@0)
        for (aIterator = aVector.begin();aIterator != aVector.end())
        {
        if (aVector.get(aIterator )==0)
        aIterator =aVector.erase(aIterator );
        alterator++;

        }

        so, if the last element is 0,error ?I failed to answer this question
        • if alterator points to the last element, aVector.erase(aIterator ) will return end(). -jfhuang(Zigzag); 2001-7-23 {312} (#142228@0)
          So you have to check if alterator is at the end. Otherwise you will get an error. The modified code is as follows,


          for (aIterator = aVector.begin();aIterator != aVector.end())
          {
          if (aVector.get(aIterator )==0)
          aIterator =aVector.erase(aIterator );
          if (aIterator != aVector.end()) alterator++;

          }
          • It seems that you are an expert in C++, could you please help me? Just some simple questions.Thank you! -lynx(jane); 2001-7-23 {1584} (#142238@0)
            本文发表在 rolia.net 枫下论坛I installed VC++6.0 this morning and tried the program. But it still had some problems:
            1, I want to know a function that can read the current time of the system, and how to use it. Is it read the seconds or the minutes?In C, it is called biostime().
            2, I built the .exe file and I ran it. The program first just read some parameters as you input them, and also the .dat file name. Please see below:

            1 printf(" Please input learning factor---Et & dEt: (
            Note:0.1>=Et>=0) \n");
            2 scanf("%f",&Et);
            3 scanf("%f",&dEt);

            4 printf(" Please slope value of g() --- alfa:\n");
            5 scanf("%f",&alfa);
            6 printf(" Please input learning factor---beita:\n");
            7 scanf("%f",&beita);
            8 printf(" Please input learning factor---bstep:\n");
            9 printf(" ( Note: 0.1beita>bstep>0.000 ) \n");
            10 scanf("%f",&bstep);

            11 gets(ldfnm);
            12 printf(" Please input learning data file name(iol?.dat):\n");
            13 gets(ldfnm);

            14 sss=fopen(ldfnm,"r");
            15 fscanf(sss,"%d%d",&inputN1,&inputN1);
            16 fscanf(sss,"%d",&modelN);
            17 outputN=62;
            18 position=ftell(sss);
            19 p=position;
            20 fclose(sss);

            So the above part works until line 13, I can input all those parameters. But when I input the .dat file name (line 12 stll works), it stop working. A window jump out and said that
            "Debug assertion failure.
            Program: D:\program\Debug\learning.exe
            File: fscanf.c
            Line: 54
            expression: streams!=NULL"

            Could you please tell what's wrong with the program? What means assertion failure?How to deal with it?
            Thank you very much!更多精彩文章及讨论，请光临枫下论坛 rolia.net
            • Several ways can be used to get the current time -jfhuang(Zigzag); 2001-7-24 {679} (#143677@0)
              1. You can try GetSystemTime() as follows:

              SYSTEMTIME currentTime;
              int second, minute;
              GetSystemTime(&currentTime);

              second = currentTime.wSecond;
              minute = currentTime.wMinute;
              .......

              2. I don't know how you define the string ldfnm. You should define char ldfnm[30], or something like that, to allocate memory. Otherwise you may get an error.
              Assertion is a debug method. The statement is like : assert(x==1). if x does not equal to 1, the program will raise an assertion failure. It can help you to debug the program. There are a lot of assertion statement in the C/C++ library to help you debug your programm.
              • Thank you very much and I have sloved the problems. -lynx(jane); 2001-7-24 (#143694@0)
            • There are several ways to get the current time -jfhuang(Zigzag); 2001-7-24 {679} (#143680@0)
              1. You can try GetSystemTime() as follows:

              SYSTEMTIME currentTime;
              int second, minute;
              GetSystemTime(&currentTime);

              second = currentTime.wSecond;
              minute = currentTime.wMinute;
              .......

              2. I don't know how you define the string ldfnm. You should define char ldfnm[30], or something like that, to allocate memory. Otherwise you may get an error.
              Assertion is a debug method. The statement is like : assert(x==1). if x does not equal to 1, the program will raise an assertion failure. It can help you to debug the program. There are a lot of assertion statement in the C/C++ library to help you debug your programm.
          • good,good, thanks,thanks. -qiuqiu(秋秋); 2001-7-23 (#142240@0)
          • thanks. u r so helpful -wendywendy(wind); 2001-7-25 (#143834@0)

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