atoi, _atoi_l, _wtoi, _wtoi_l

#include <stdlib.h>#include <stdio.h>#include <errno.h>int main( void ){    char    *str = NULL;    int     value = 0;    // An example of the atoi function.    str = "  -2309 ";    value = atoi( str );    printf( "Function: atoi( \"%s\" ) = %d\n", str, value );    // Another example of the atoi function.    str = "31412764";    value = atoi( str );    printf( "Function: atoi( \"%s\" ) = %d\n", str, value );    // Another example of the atoi function     // with an overflow condition occuring.    str = "3336402735171707160320";    value = atoi( str );    printf( "Function: atoi( \"%s\" ) = %d\n", str, value );    if (errno == ERANGE)    {       printf("Overflow condition occurred.\n");    }}
Function: atoi( "  -2309 " ) = -2309Function: atoi( "31412764" ) = 31412764Function: atoi( "3336402735171707160320" ) = 2147483647Overflow condition occurred.