atol() - Utility Function
How is Utility function "atol()" used in C++?
How to convert a string to Long Integer?
Explanation
atol() is a Utility Function that converts a string into a long value. The string must contain a valid long integer value, the rest of the string characters are terminated by white space, punctuation, characters. If a long integer is not found the result may be undefined, but in most scenarios will return 0.
int atol(const char *str);
Result :
Enter a string with a long integer:: 134.56
The entered value is:: 134
The bytes occupied is:: 4
In the above example atol() is used to return the long value as "134" leaving the decimal ".56".
Syntax to convert a string to Long Integer:
int atol(const char *str);
Example :
| #include <stdlib.h> #include <iostream.h> int main() { char arr[10]; cout << "Enter a string with a long integer:: "; cin >> arr; cout << "Value returned by atol is:: " << atoi(arr) <<'\n'; cout << "Bytes occupied is:: " << sizeof(atoi(arr)); } |
Result :
Enter a string with a long integer:: 134.56
The entered value is:: 134
The bytes occupied is:: 4
In the above example atol() is used to return the long value as "134" leaving the decimal ".56".
