Quiz Entry - updated: 2026.07.14
What tools can help you understand C code and its compilation?
A few online tools make C concrete: Godbolt shows the assembly, Python Tutor animates memory and pointers, and cdecl translates gnarly declarations into English.
| Tool | URL | Purpose |
|---|---|---|
| Compiler Explorer | https://godbolt.org/ | See assembly output from C code |
| Python Tutor | https://pythontutor.com/c.html | Visualize memory and pointers |
| cdecl | https://cdecl.org/ | Decode complex C declarations |
| C Reference | https://en.cppreference.com/w/c | Standard library documentation |
Compiler Explorer (Godbolt):
- Type C code, see assembly in real-time
- Compare different compilers (gcc, clang)
- See effect of optimization flags (-O0 vs -O3)
Python Tutor for C:
- Step through code line by line
- See variables, pointers as arrows
- Visualize stack frames during function calls
cdecl example:
Input: int (*(*fp)(int))[10]
Output: "fp is a pointer to a function (int) returning
a pointer to an array 10 of int"
Local tools:
# Generate assembly
gcc -S code.c
# Preprocessor output only
gcc -E code.c
# Disassemble executable
objdump -d a.out
# Interactive debugger
gdb ./a.out
# Memory error detection
valgrind ./a.out