{{keywords>wiki library source code example reference}}
====== atol ======
<code c>
    #include <stdlib.h>
     long int atol(const char *str); 
</code>    
    convert a string to long integer

===== C Sourcecode Example =====    
<code c>
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <stdlib.h>

int main(void){

    char string[]="1234";
    long int  i;
    
printf("string = %s \n", string );
printf("int = %li \n", atol(string) );

i = atol(string);
i = i + i;
printf("i + i = %li\n", i);

return 0;
}

</code>

==== Output ====

    Output:
    user@host:~$  ./atol 
    string = 1234 
    int = 1234 
    i + i = 2468