Two Seven Segment Display and two Switches

[Nisar]

Hello every boady
I want to increment by one contineously is executed only when S1 switch is pressed. When the switch is released, the increment stops. When S2 switch is pressed, it initiate a decrement contineously by one. S1 and S2 are connected with PIC16F877 Port B Pin RB1 and RB2 respectively.
Plz any body help me as mention above in C Coding.

My contineously up counting from 00 to 99 C code are here
#include<16f877.h>
#fuses XT,NOLVP,NOWDT,PUT
#use delay (clock=4000000) // defind crystal = 4MHz
#byte port_d=8
#byte port_a=5
byte CONST LED_MAP[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0X80,0x90};

//===========================================
// this function use to display number 00=99
// input : n = number to display
//===========================================
void display_number(int n)
{

output_d(LED_MAP[n/10]);//tens position;n=0 to 9
output_low(PIN_A1);
delay_ms(2);
output_high(PIN_A1);
output_d(LED_MAP[n%10]) ;//unit position
output_low(PIN_A0);
delay_ms(2);
output_high(PIN_A0);
}
//============================================
// main program
//============================================
void main()
{
int i,count=1;

while(TRUE)
{
for (i=0;i<=200;i++)
display_number(count); // dispay 200 times
count=(count==99) ? 1: count+1;//count+1=++count

}
}
Thanks
Nisar Ahmed


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