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atol(), atoll() and atof() functions in C/C++
atol() Function
The function atol() converts string into a long integer. It returns zero, when no conversion is performed. It returns the converted long int value.
Here is the syntax of atol in C++ language,
long int atol(const char *string)
Here is an example of atol() in C++ language,
Example
#include <bits/stdc++.h>
using namespace std;
int main() {
long int a;
char str[20] = "538756";
a = atol(str);
cout << "Converted string into long int : " << a << endl;
return 0;
}Output
Converted string into long int : 538756
atoll() Function
The function atoll() converts string into a long long integer. It returns zero, when no conversion is performed. It returns the converted long long int value.
Here is the syntax of atol in C++ language,
long long int atoll(const char *string)
Here is an example of atol() in C++ language,
Example
#include <bits/stdc++.h>
using namespace std;
int main() {
long long int a;
char str[20] = "349242974200";
a = atoll(str);
cout << "Converted string into long long int : " << a << endl;
return 0;
}Output
Converted string into long long int : 349242974200
atof() Function
The function atof() converts string into a floating point number of double type. It returns zero, when no conversion is performed. It returns converted floating point value.
Here is the syntax of atol in C++ language,
double atof(const char *string)
Here is an example of atof() in C++ language,
Example
#include <bits/stdc++.h>
using namespace std;
int main() {
double a;
char s[20] = "3492.42974200";
a = atof(s);
cout << "Converted string into floating point value : " << a << endl;
return 0;
}Output
Converted string into floating point value : 3492.43
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