[FS] Calculator SA:MP [by FanHamMer]

#include            "a_samp.inc"

#file                           "Calc by FanHamMer"

#define d_calc                  (0x83)

public OnFilterScriptInit()
{
    printf("Calc_"#by"_FanHamMer");
    return true;
}

public OnFilterScriptExit() return true;

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (strcmp("/calc", cmdtext, true, 10) == 0)
    {
        ShowPlayerDialog(playerid, d_calc, DIALOG_STYLE_INPUT, \
        "Calculator", "Enter a value 'a'", "Enter", "Cancel");
        return true;
    }
    return false;
}

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    static a, b, c;
    switch(dialogid)
    {
        case d_calc:
        {
            if !response *then return true;
            if !strlen(inputtext) *then return true;
            a = strval(inputtext), \
            ShowPlayerDialog(playerid, d_calc+0b1, DIALOG_STYLE_INPUT,  \
            "Calculator", "Enter a value 'b'", "Enter", "Cancel");
        }
        case d_calc+0x1:
        {
            if !response *then return true;
            if !strlen(inputtext) *then return true;
            b = strval(inputtext), \
            ShowPlayerDialog(playerid, d_calc+0b10, DIALOG_STYLE_INPUT,\
            "Calculator", "Enter the operator (*, /, -, +)", "Enter", "Cancel");
        }
        case d_calc+0b10:
        {
            if !response *then return true;
            if !strlen(inputtext) *then return true;
            static str[21];
            if strfind(inputtext, "+", true) != -1 *then
            c=a+b, format(str,21,"%i+%i = %d",a,b,c);

            if strfind(inputtext, "-", true) != -1 *then
            c=a-b, format(str,21,"%i-%i = %d",a,b,c);

            if strfind(inputtext, "*", true) != -1 *then
            c=a*b, format(str,21,"%i*%i = %d",a,b,c);

            if strfind(inputtext, "/", true) != -1 *then
            c=a/b, format(str,21,"%i/%i = %d",a,b,c);

            SendClientMessage(playerid,-1,str);
        }
    }
    return true;
}