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character pointer, and if you want to use strlen to get the length of the s string, you should use sizeof (S.C_STR ()), because the member function of String c_str () returns the first address of the string. In fact, the string class provides its own member function to get the capacity and length of the string, respectively capacity () and lengths (). String encapsulation is used in strings, so it is best to use string instead of the C type string in C + + development.About sizeof (string), as

If you are a lazy programmer, you see the following code may be annoyed Abstract class u{ } Class U1 extends u{ public static function Create () { return new U1 (); } } Class U2 extends u{ public static function Create () { return new U2 (); } } This piece of code works fine, but a lot of repetitive code can be annoying. I don't want to add the Create method to each subclass, and if you put the Create meth

the type, the alignment boundary must be 1, 2, 4, 8, 16, 32, 64.Struct s1{Char a [8];};Struct s2{Double d;};Struct s3{S1 s;Char;};Struct s4{S2 s;Char;};Cout Cout Cout Cout The size of s1 and s2 is 8, but the alignment of s1 is 1 and s2 is 8 (double). Therefore, this difference exists in s3 and s4.Therefore, when you define a struct, if the space is insufficient, consider alignment to arrange the elements in the struct. Union alignment: it is the largest alignment among members. The length is th

is the number of characters starting from the specified address to the first zero. It is executed in the running stage, and sizeof is the data size, here is the string capacity. Therefore, the sizeof value is constant for the same object. String is a C ++ string. It is a class. Therefore, sizeof (s) indicates not the length of a string, but the size of a string. Strlen (s) is wrong at all, because the strlen parameter is a character pointer. If you want to use strlen to get the length of the S

to use strlen to get the length of the S string, you should use sizeof (S. c_str (), because the string member function c_str () returns the first address of the string. In fact, the string class provides its own member functions to obtain the capacity and length of the string, namely capacity () and length (). String encapsulates string operations, so it is best to use string to replace C-type strings during C ++ development. 8. view the CPU peer bounds from the sizeof problem of union Conside

you want to use strlen to get the length of the S string, you shouldSizeof (S. c_str () is used because the string member function c_str () returns the first address of the string. In fact, the string class provides its own members.Function to obtain the capacity and length of the string, namely capacity () and length (). String encapsulates common string operations, so it is best to useString is a string of the C type. Note: For sizeof (string), it seems that different implementations return d

encoding of the file header, otherwise there will be problems. The file is encoded in Linux. You can use commands in vim.set fenc. If the file encoding is gbk and the declared encoding in the header of the source code file is UTF-8, the problem may occur if there is Chinese in the source code, because the Chinese str storage is encoded according to gbk, while python thinks it is UTF-8 encoding when parsing str, it will reportSyntaxError: (unicode error) 'utf8' codec can't decode byteError.2.2 d

to turn the car I do not introduce, online tutorials a lot more). The above said so much, in fact, is also very abstract, below a gathering elephant,. Make a simple schematic diagram of your own drawing first. Controllercontrolled EndThese two graphs are I draw to help you understand (I do this by the controlled side of the circuit, the speed is slightly slower. We can be in the drive there to make a amplification circuit, speed can go up, but can not back, we can directly use the l298n drive.

State start; +start.v[0]=start.v[1]=0; start.v[2]=jug[2]; -start.dist=0; the Q.push (start); *vis[0][0]=1; $ while(!Q.empty ()) {Panax NotoginsengState u=q.top (); Q.pop (); - Update_ans (u); the if(ans[d]>=0) Break; + for(intI=0;i3; i++) A for(intj=0;j3; j + +) the if(i!=j) { + if(u.v[i]>0u.v[j]Jug[j]) { - intMount=min (Jug[j],u.v[i]+u.v[j])-U.v[j]; $ State U2