Common types of computer bugs with pseudocode example

1. Divide by zero:   B=0 ; A=A/B;
   
2. NULL pointer dereference:
   
3. Infinite loops: For i=10 to 1 step 1
   
4. Arithmetic overflow or underflow:
   
5. Exceeding array bounds: Define A[10] ....B=11; A[B]=1;
   
6. Using an uninitialized variable :
   
7. Accessing memory not owned (Access violation) : 
   
8. Memory leak or Handle leak :
   
9. Stack overflow or underflow :
   
10. Buffer overflow :
    
11. Deadlock :
    
12. Off by one error :
    
13. Race condition :
    
14. Loss of precision in type conversion :
    

Source: Wiki

1.