Concept explainers
“atol” function:
In C++, the predefined function “atol” is used to convert a string value into a long integer value; it passes a string literal or character array as an argument and it converts the received value into a long integer value; it takes only one parameter as an argument.
- If the argument value contains nonconvertible contents combined with the integer value then the values will be ignored while converting.
- In same way, the function will return “0” when the values can’t be able to convert into double data type.
Syntax:
Syntax for “atol” function is as follows:
long int atol (const char* n);
In the above statement,
- “long int” represents the return type of the function.
- “atol” represents the name of the function.
- “const char*” represents the data type of the passing argument.
- “n” is a string variable which is required to be converted.
Example:
The example for the “atol” function is as follows:
//change the string literal to a long type value
long n = atol ("123456 hello");
In the above line, the string literal “123456 hello” is passed as an argument to “atol” and it returns the converted value that is “123456”; here the “atol” function ignores the whitespace and the nonconvertible value “hello”.
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