Pic Display cycle between 5 and 0 - c++

Question

Here is our code. We tried to make the display cycle between 5-0, but it's stuck at 5.
void main()
{
unsigned char count=0;
unsigned char table[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
TRISC=0;
while(1) {
for(count=0;count<6;count++) {
PORTC=table[count];
delay_ms(59);
if(count==5 && count>=0)
{
count -= count;
}
}
}
}
It goes to 5, but it's not coming back to 0.
Our proteus design and other stuff is true. The only problem is in the code we wrote.
Pic 16F877A

Answer 1

Your if-statement decreases the count from 5 to 4, but the for-loop then increases the value back to 5. Once the count reaches 5, this will repeat forever. You'll need to re-design the logic to get an up-ramp/down-ramp behavior (that cycles between 0 and 5). Try something like this:
void main()
{
unsigned char count=0;
unsigned char table[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
TRISC=0;
bool increment = true;
while(1) {
PORTC=table[count];
delay_ms(59);
// Increment or decrement.
count += increment ? 1 : -1;
// Switch from incrementing to decrementing (or vice versa).
if (count >= 5 || count <= 0) {
increment = !increment;
}
}
}
This defines a boolean flag increment to designate whether we are incrementing or decrementing the count variable. When count gets to the upper or lower bound, the increment flag gets inverted.