generating a clock using void isr interrupt

[winnie mong]

hi guys....
i have an interrupt function from a library i am using and i want to use it to produce a clock for my timer.please have a look at what i tried to produce and kindly provide your assistance by indicating where i could have gone wrong..thanks

here i have the function from the library

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Code C - [expand]
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interrupt isr(void)
{
    if(T0IF) {
        ++pulses;                               // increment pulses
        T0IF=0;                                 // reset TMR0 flag
        
    }
 
}

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my effort in producing the clock

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Code C - [expand]
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extern unsigned char pulses;
{
    sec=0;
    min=0;
    hour=0;
void clock()
{
    stop=pulse+160;
    if(++sec==60){
           min++; }
    if(++min==60){
           hour++; }
    if(++hour==24){
        hour=0; }
}

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Code C - [expand]
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if(++pulses==stop){
    clock();
    stop=++tick=1;
}

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using the function in main()

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Code C - [expand]
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int main()
 
if (tick){
    clock();
    tick=0;
}

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