Exercises

Vorlesung

#timestamp 20250916

• Look at chapters 1,2,4 in textbook (@2025-09-17)
  • big/little endian
  • bitwise operations on words
  • cache architectures
  • virtual memory
  • registers
  • adressing modes
  • instruction formats
  • strong typing
  • design-by-contract
  • object-orientation

#timestamp 20250917

C-Workflow

// conditionals
if(statement) else

switch(integrer) {
	case const_1: sth; break;
	case const_2: sth; break;
	default; break;
}
// functions
return;
// loops
for(initial; test; increment) statement
while(bool_expression) statement
do statement while (bool_expression)
// jumps
break
continue
goto label
// I/O (not part of C)
printf()
// basic types
// - declatations
// - scopes and static
int
float
bool // (just int)
void
const
enum

• int is always 4bytes/32bits
• float is always 4bytes/32bits
• double is always 8bytes/64bits
  -> all other types are different based on the implementation

• early termination for || and &&, like in CPP

#timestamp 2025-09-23

• C compiler does not check the array bounds
• multidimensional array: int mat[3][3]
• string := array of char's terminatd with null byte

#timestamp 2025-10-01

int *p;                   // p is a pointer to int
int *p[13];               // p is an array[13] of pointers to int
int *(p[13]);             // p is an array[13] of pointers to int
int **p;                  // p is a pointer to a pointer to an int
int (*p)[13];             // p is a pointer to an array[13] of int
int *f();                 // f is a function returning a pointer to int
int (*f)();               // f is a pointer to a function returning int
int (*(*f())[13])();      // f is a function returning a pointer to an array[13] of pointers to functions returning int
int (*(*x[3])())[5];      // x is an array[3] of pointers to functions returning pointers to array[5] of ints

#timestamp 2025-10-12

#timestamp 2025-10-31

• useful for lab 5: https://web.navan.dev/posts/2023-10-04-bomb-lab.html
• my solution: 20251031_SysPCA_bomb_lab