C Question, how do you convert a number to a string?

1. First write the content of the note, as shown in the figure below.

2. Then write the data type (char) + string name, as shown in the figure below.

3. Next, you need to write the content of the string after the =, as shown in the figure below.

4. Next, you need to print out the content of the string, as shown in the figure below.

5. Next, you need to click Compile at the top, as shown in the figure below.

6. Next, you need to click Run.

7. At this time, you can see that the string just defined has been output.

C provides several standard library functions that can convert numbers of any type (integer, long integer, floating-point, etc.) to strings. Convert an integer to a string with the itoa() function, encoded as follows:

# include

# include

void main (void);

void main (void)

The iToa() function has 3 parameters: the first parameter is the number to be converted, the second parameter is the target string to be written to the conversion result, and the third parameter is the cardinality used to transfer the number. In the example above, the conversion base is 10.

Participate in the operation in the form of a string and copy it to a character variable. For example: int a=10; char b;b=(char)a;

You can use sprintf include""

main()

You can also use the Itoa function, but it's a non-standard C extension function, so it can't be used in all compilers.

Right-holding, generally""itoa(int value, char *string, int radix); The last parameter is the base system, which is usually written as 10

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.

1. You can use the atoi function.

Example: char a='7';

int num=atoi(a);

2. If it is a lot of numbers, the string form is converted to int type in the following way.

Example: string s="1234";

int i = ;

3. The function of the int() function: it is used to convert a string or number to an integer.

4. Define a str1 variable, **:str1="10"。

5. Use the int() function to convert the str1 variable to a number.

Let's give you an example!

Almost, think for yourself, draw inferences.

Extract the number* from a string

#include

int main()

k = j;

n = 0;

j = i;

while(jprintf("%d",n);

i = k;

continue;

i++;return 0;}

C++ Programming: Convert a String of Numbers to an Integer?

Use C++ to write a program by arbitrarily entering the bank deposit principal, deposit annual interest rate, and deposit tenure from the keyboard, and calculate the sum of principal and interest (excluding compound interest).

What's wrong with how to write this program.

Enter the bank deposit principal, annual interest rate, and deposit tenure arbitrarily from the keyboard to calculate the sum of principal and interest (excluding compound interest).

#includeusing namespace std; int main(){int x; int y； int z；int cc； cout<>x; cout<>y； cout<>z；cc=z*y； cout<

Use C++ to input a 4-digit integer from the keyboard at will, and output the single digit, ten digit, hundred, and thousand digits respectively.

Determine the length of the character to 4 digits directly down to allow.

Run. Enter a double-precision floating-point data on the keyboard to determine whether it is positive, negative, or zero, and output the result.

Enter a double-precision floating-point data on the keyboard to determine whether it is positive, negative, or zero, and output the result.

Judging by size.

More than 0 is positive, less than is negative, equal to 0.

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<>