我对strcmp的使用不正常

问题描述

请帮帮我。 strcmp不正常它只返回70，即使2个字符串不同。



pch包含（0.06666,0.0333,0.0666等）

测试包含（0.0333）

Please help me out. strcmp not working properly it's only return "70" even though 2 strings are diffrent.

pch contain(0.06666, 0.0333, 0.0666 and so on)
test contain ("0.0333")

float ReadFile(float Elastmod[], int NumLines,float Elastmod3[])
{
ifstream myReadFile;
char inputfile[_MAX_FNAME ],
Extension[ _MAX_EXT ] = ".CSV";

_makepath(Infilename, "C:", Dir, inputfile, Extension);

 myReadFile.open("Rdm1.csv");

 char test[] = "0.0333";

 char* pch; 

char* Token; //DYNAMICALLY ASSIGN ARRAY
Token = new char[NumLines];

int i;
 if (myReadFile.is_open()) 
 {
 while (!myReadFile.eof()) 
 {

    myReadFile.ignore(256,'\n');  // to ignore first Line
	
    myReadFile.getline(Token,256,',');


    for(int i=0;i<(NumLines-1);i++)
    {
          pch = strtok (Token,",");

	  myReadFile.getline(Token,256,',');

	  Elastmod[i]= atof(pch) ;



	int result=  (strcmp (pch,test) == 0);

        if (result == 1)

	    Elastmod3[i]= atof("90");

        else if ( result == 0)

	     Elastmod3[i]= atof("70");

         else
             Elastmod3[i]= atof("888");
}
  }

 }

else
{
//cout << "Error opening file";
}

myReadFile.close();

return Elastmod3[NumLines]  ;
}

谢谢。





[edit]已添加代码块 - OriginalGriff [/ edit]

Thank you.


[edit]Code block added - OriginalGriff[/edit]

推荐答案

int result=  (strcmp (pch,test) == 0);
cout << "Result=" << result << endl;
cout << "Pch=" << pch << endl;
cout << "Test=" << test << endl;
cout << "Strcmp=" << (strcmp(pch,test)) << endl;

看看究竟有什么比较，我认为pch可能不是你想象的那样。

And see what exactly is being compared, I'm thinking that pch may not be what you think it is.

Returns an integral value indicating the relationship between the strings:
A zero value indicates that both strings are equal.
A value greater than zero indicates that the first character that does not match has a greater value in str1 than in str2; And a value less than zero indicates the opposite.

所以你的代码应该是这样的：

So your code is probably supposed to be something like:

int result = strcmp (pch, test);
    if (result > 0)
    Elastmod3[i]= 90.0;
    else if (result == 0)
    Elastmod3[i]= 70.0;
    else
        Elastmod3[i]= 888.0;

请注意，我已经删除了atof电话，这些只是无聊。



And我们在这里：与strcmp的整个比较没有多大意义。您可能想要比较浮点值。在线

Note that I have removed the atof calls, which are just nonesense.

And while we are at it: The entire comparison with strcmp does not make much sense. You probably want to compare the float values. And in line

Elastmod[i]= atof(pch) ;

您已将pch转换为浮动。为什么不直接将该值与另一个值进行比较，例如：

you converted already pch to float. Why don't you just compare that value to another, like:

float test = 0.0333;
...
float pchf = atof (pch);
...
if (pcfh > test)
    Elastmod3[i]= 90.0;
else if (pcfh == test)
Elastmod3[i]= 70.0;
else
    Elastmod3[i]= 888.0;

还有一条评论：对两个浮点值相等的测试测试在大多数情况下确实没有多大意义。

And one more comment: Test test on equality of two floating point values does in most cases make not much sense.

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