c Convert a string type to a numeric type

This depends on the converted string.

1. First of all, the first conversion method is: convert the string type into a number type, and the method conversion is directly converted with to number(), and the specific syntax is to number(str).

2. The second type: convert the number type into a string type.

This conversion method uses to char(), in fact, the conversion method is a bit similar to the above to number() mode, and the following 999 represents the same meaning as the above.

3. The third type: Alarm infiltration converts the date type into a string type.

In fact, this method also uses to char(), which is to convert the date format to the type of format you want to spine, which is more personalized.

4. The following conversion of the date type into a common string type is used more frequently, and it is also a relatively complete string format.

5. The last one: convert the string type into a date type, and use to date() to convert this conversion method. The usage is also relatively simple, and the converted date format is also customized by yourself.

6. Complete the renderings.

Example: stringa="abcdefg";

stringb=newstring[;

for(inti=0;ib[i]=,1);

tochararray() returns an array of char types.

The conversions are as follows:

The string type is the primitive type in c, which will be automatically converted to the fcl type during compilation, for example, string corresponds to the fcl type.

The C language can easily build various data structures, and can be directly addressed in memory and directly manipulated in hardware by pointer types.

;And; All types can be converted.

Another is that parse can only convert string types, such as float f =

int i = ;(False).

int i = right) ;

There are many ways to do this, and you can do this by a+"".

The best way to do this, though, is to use type casting;

C++ strings can be converted to numbers that can be leveraged by StringStream, and can be floating-point numbers.

The StringStream class was mainly used in earlier versions of C++, where it could do input and output work by strings. To use the StringStream class, you must first include the sstream library at the top of the program by adding the include line. Then add StringStream and create a StringStream object that will hold the value of the string to be converted to an int and will be used in the process of converting it to an int.

You can use the operator to extract strings from string variables. Finally, use the " operator to input the newly converted int value into the int variable. Here's how:

#include

#include

using namespace std;

int main()

int x;

string str;

cin>>str;

x=stoi(str);

cout<>

For example, if the ASCII corresponding to character 1 is 48, the conversion relationship can be the ASCII value -48.

Extension: 1. Strings are mainly used for programming, and the concept description, function explanation, and usage details are shown in the text, and here is a point to add: strings are similar to character arrays in storage, so a single element of each of them can be extracted, such as s="abcdefghij", then s[1]="a"，s[10]="j", and the zero bit of the string is exactly its length, as in s[0]=10 ( The above function ansistring does not. , which can provide us with a lot of convenience, such as high-precision operations when each bit can be converted into numbers and stored in arrays.

2. A string or string is a string of characters composed of numbers, letters, and underscores. It is generally denoted as s="a1a2···an"(n>=0)。It is a data type that represents text in a programming language.

In programming, a string is a continuous sequence of symbols or numeric values, such as a string of symbols (a string of characters) or a string of binary numbers (a string of binary numbers). Usually the whole of the string is used as the operation object, such as: finding a substring in the string, finding a substring, inserting a substring at a certain position in the string, deleting a substring, etc.

The sufficient and necessary conditions for two strings to be equal are that they are equal in length and that the characters in each corresponding position are equal.