“stoi” function: In C++, the predefined function “stoi” is used to convert a string value into an integer value; it contains three parameters to refer the string to convert, position of first character in the string after the number. Syntax: Consider the syntax for the “stoi” function is as follows: int stoi ( const string& n, size_t* s = 0, int base = 10); In the above statement, “int” represents the return type of the function. The first parameter “const string& n” represents the string to be converted. The second parameter “size_t* s” represents the position of first character in the string after the number and this argument is an optional one. The third parameter “base” represents the base of the conversion and this argument is an optional one. Example: Example for the “stoi” function is as follows: //declare and assign the value to the variable string s = "5478hai"; //change the string object to an integer value. int n = stoi(s); In the above code, the string value “5478hai” stored in the variable “s” is converted into an integer and stored and into the variable “n”; the above statement results the value “5478”.

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Chapter 12.3, Problem 12.12CP

Program Plan Intro

“stoi” function:

In C++, the predefined function “stoi” is used to convert a string value into an integer value; it contains three parameters to refer the string to convert, position of first character in the string after the number.

Syntax:

Consider the syntax for the “stoi” function is as follows:

int stoi ( const string& n, size_t* s = 0, int base = 10);

In the above statement,

“int” represents the return type of the function.

The first parameter “const string& n” represents the string to be converted.

The second parameter “size_t* s” represents the position of first character in the string after the number and this argument is an optional one.

The third parameter “base” represents the base of the conversion and this argument is an optional one.

Example:

Example for the “stoi” function is as follows:

//declare and assign the value to the variable

string s = "5478hai";

//change the string object to an integer value.

int n = stoi(s);

In the above code, the string value “5478hai” stored in the variable “s” is converted into an integer and stored and into the variable “n”; the above statement results the value “5478”.

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