C language · Valgrind-clean · From $20
Do My C Homework
In C, the assignment is the memory model. We write your code the way the grader reads it: zero leaks under Valgrind, zero warnings under -Wall -Werror, and every pointer you can defend in a viva.
No leaks · Warning-free build · Pay 50% after it runs
What we cover in C
The toolchain your course actually grades you on
C coursework lives and dies on the build, not the IDE. Graders compile your submission with gcc -std=c11 -Wall -Wextra -Werror -g, run it under valgrind --leak-check=full, and step through the crash in GDB. We write to the same 12 tools, so the code passes where it counts.
Behind those tools sits the work itself: malloc, free, calloc, and realloc over the heap; pointers, NULL, and the dangling pointer that segfaults a program two functions later; structs wired into linked lists and hash tables; printf, scanf, and fgets where most buffer bugs start. The mental model under all of it is the split between the stack and the heap, and every grade in a systems course rests on getting that split right.
Assignment types we cover
Do my C assignment, whatever the lab is
Four C deliverables make up most of the coursework we see. Each runs 150 to 600 lines across two to five .c and .h files, plus the Makefile the grader builds.
Linked lists and hash tables with manual malloc and free
The data-structures staple. We build a doubly linked list or a chained hash table where head and tail are freed exactly once, children are freed before the parent, and Valgrind reports zero "definitely lost" and zero "indirectly lost" blocks on the grader input.
Your own memory allocator over sbrk or mmap
The CS3650, CS341, CS4400, and Wellesley CS240 "implement malloc" lab. We write my_malloc and my_free with block-header bookkeeping in first-fit or best-fit, then add the thread-safe version that wraps the free list in a pthread_mutex_lock when the assignment requires concurrency.
A Unix shell or a string and CSV parser
Built with fork, exec, pipe, and <string.h>. The shell tokenizes input, handles redirection, and runs child processes. The parser copies into fixed buffers with strncpy and snprintf so nothing writes past the array and the null terminator always fits.
CS50-style psets through check50 and style50
mario, caesar, substitution, recover, and speller. The spell checker speller has to be both correct and leak-free under Valgrind, so we load the dictionary, free every node on exit, and submit code that reports green on check50 and clean on style50.
How C assignment help works
C assignment help built around the grader, not the demo
The process is the deliverable. You send the brief and the -std= flag, we quote one fixed price, and you pay half to start. What comes back is graded the way your TA grades it.
Standard match
We write to the exact C standard in your brief, from C89 to C23, and build with the flag set your Makefile names. No version drift between our machine and the autograder.
Valgrind-clean gate
Before delivery the code runs clean under --leak-check=full --show-leak-kinds=all. Output-correct-but-leaky still fails a systems course, so a clean run is the bar we ship to.
The viva sheet
You get a short sheet answering why each pointer is freed exactly once, with two or three questions a TA is likely to ask. The code is commented so the explanation is yours to give.
Pay 50 percent after it runs
You pay the first 50% to start and the other 50% only after the build is clean on your input. Revisions stay free for 7 days.
C homework help by failure mode
The six C bugs we fix every week
Most C homework help is one of six named failures. Each has a known fix mechanism, and the sanitizer or debugger that catches it.
Segmentation fault (SIGSEGV)
A dereference of NULL, a freed pointer, or an index past the end of an array. We reproduce the crash under GDB, read the backtrace to the exact faulting line, and guard every dereference with a NULL check so the program stops trusting a bad address.
Memory leak
A malloc with no matching free, which Valgrind flags as "definitely lost" or "indirectly lost". We pair every allocation with a free on every exit path, including the error paths, and free children before parents inside linked structures.
Dangling pointer and use-after-free
A read or write through a pointer after free() has already returned the block. We set the pointer to NULL the instant it is freed, so a later use faults loudly at a known line instead of silently corrupting the heap.
Buffer overflow
strcpy, gets, or an unbounded scanf writing past a fixed array. We switch to the bounded calls strncpy, snprintf, and fgets, and size every buffer to length plus one so the trailing \0 has a home.
Off-by-one and fencepost errors
A loop that runs <= instead of <, or an allocation that forgot the null terminator byte. We allocate n + 1, iterate the half-open range [0, n), and confirm the fix under AddressSanitizer, which catches the single-byte overread that Valgrind can miss.
Uninitialized reads and undefined behavior
Reading garbage stack memory or relying on signed-integer overflow. We initialize at the point of declaration and compile with -Wall -Wextra plus -fsanitize=undefined, so UBSan traps the illegal operation at runtime rather than at the demo.
Where C is taught
We write to your course, not a generic style
C shows up at three levels, and each grades a different thing. Tell us the course and we match its convention, from the CS50 style guide to a Gradescope hidden harness to a command-line-only Makefile build.
Intro CS taught in C
Harvard CS50 runs weeks 1 to 5 in pure C, with mario, caesar, recover, and speller graded by check50 for correctness and style50 for the CS50 style guide. The submission rule is plain: eliminate every warning and every error. We build to exactly that, so the autograder reports green and the style checker stays quiet.
Systems and computer organization
This is the heart of C coursework. Stanford CS107 takes C down to the microprocessor and data representation. Northeastern CS3650 runs assembly plus C from the command line and tells students to resist the urge to use an IDE. UIUC CS341, Utah CS4400, and Wellesley CS240 all ship the implement-malloc and shell labs. We deliver the Makefile target these courses grade, not a project file.
Operating systems
Upper-level OS courses assign fork, exec, pthread, and allocator work where concurrency and process control are the point. We write thread-safe code with pthread_mutex_lock around shared state, so the allocator or the scheduler holds up under the grader concurrent test, not just a single-threaded run.
One grading rule carries across all three. Valgrind-clean is a hard gate, so a program that prints the right answer but leaks still fails. Gradescope runs hidden test harnesses, the -Wall -Werror build is treated as pass or fail, and MOSS checks every submission against the rest of the class. That last point is why we write each delivery from scratch for your brief, never from a template that another student could also receive.
// before: speller segfaults on dictionary load, 14 blocks definitely lost
// after: $ valgrind --leak-check=full ./speller dictionary text
// ==0== All heap blocks were freed -- no leaks are possible
// ==0== ERROR SUMMARY: 0 errors from 0 contexts
// check50: :) green style50: clean delivered in 9h
//
// "I freed the hash table head twice. They found it, fixed it,
// and wrote me the line I needed for the viva."How it works and pricing
One fixed price per C assignment, from $20
Send the assignment PDF, the rubric, and the -std= flag. A developer who works in C reads the brief and sends one price, priced by complexity, with no rush fees. You pay half to start and the rest after the build runs clean.
Whole pset or one file
Help with a full C assignment, or just one file
Send the entire pset and we deliver every .c file, the headers, and a working make target the grader builds in one command. Send a single broken file and we scope it to that file. Whatever the size, the Makefile build comes with it, because systems courses grade make, not loose source.
C homework help
C questions, answered
The questions C students ask before they send a brief, from leaks and standards to check50 and the Makefile. Want help with one specific C problem, like a single segfault or a single leak? That is the cheapest tier, and the second answer below covers it.
Will my C code be free of memory leaks? +
Yes. We deliver code that runs clean under valgrind --leak-check=full --show-leak-kinds=all, with no leaks and no invalid reads or writes. You pay the second 50% only after it runs clean on the grader's input.
Can you fix a segmentation fault in code I already wrote? +
Yes. We reproduce the crash under GDB, read the backtrace to the line that faults, and patch the bad dereference. Single-file debugging like one segfault or one leak is the cheapest tier, so you do not pay for a full rewrite.
Will it compile with -Wall -Werror and no warnings? +
Yes. We build to a warning-free baseline because most autograders treat any warning as a failure. The standard flag set is gcc -std=c11 -Wall -Wextra -Werror -g, and the -g is what keeps your GDB and Valgrind line numbers readable.
Which C standard do you write to, C99, C11, or C23? +
Whatever your brief or Makefile specifies. Send the -std= flag and we match it, from C89 through C99, C11, C17, and C23. If you do not say, we default to C17 or C23, since C23 is the GCC 15 default.
Can you implement my own malloc and free allocator assignment? +
Yes. We write first-fit or best-fit over sbrk or mmap with block-header bookkeeping, then add the thread-safe pthread_mutex version when the lab calls for it. The allocator handles realloc-safe growth and reports clean under the test harness.
Will it pass check50, style50, and Gradescope? +
Yes. We build to the autograder harness and the CS50 style guide, so check50 reports correct and style50 reports clean. For Gradescope courses we match the hidden test format, not just your local console output.
Can I explain the pointer logic in my viva? +
Yes. Each delivery includes a short sheet that answers why a given pointer is freed exactly once, plus two or three questions a TA is likely to ask. The code is commented so you can read it line by line and defend every allocation.
Do you submit a Makefile, or just the .c files? +
Both. Systems courses grade the make build directly, and many ban IDEs outright, so we deliver a working make target with your headers, not loose source files. The build runs the way the grader expects on the command line.
Related languages
Studying a neighbor of C?
The closest neighbor. C++ hides pointers behind RAII, smart pointers, and the STL, so the grading is different. Land here only if you are in a C course.
The systems-course sibling. Courses like CS107 and CS3650 pair C with assembly and machine code, so the two assignments often arrive together.
The managed-memory contrast. Java has a garbage collector, so the leak grading that defines C never applies. Useful if you are choosing between the two.
Need the broader picture first? Start with our Programming Homework Help hub for the generic-intent walkthrough.
Send your C brief and get a fixed quote
Upload the assignment and the -std= flag. The first reply is free, and you pay nothing until you approve the price.