Using atol() C function to convert a string to a long integer


Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows 2003 Server Standard Edition

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C Code (/TC)

Other info:

To do: Converting a string to long integer value using atol() C function

To show: How to use atol() C function in converting a string to a long integer value





// Using atol()/_wtol()  - converting string to long

#include <stdio.h>


int main(void)


long newlong;

newlong = atol("123456");


printf("Using atol() - converting string to long\n");


printf("The string \"123456\" converted to long int is %ld\n", newlong);

printf("The converted value, %ld divided by 2 is %ld\n", newlong, newlong / 2);

return 0;



Output example:


Using atol() - converting string to long


The string "123456" converted to long int is 123456

The converted value, 123456 divided by 2 is 61728

Press any key to continue . . .



C and C++ Programming Resources | C & C++ Code Example Index