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C Advanced

Arrays, pointers, functions and memory — the heart of systems C.

3 lessons 5 tasks ⚡ Live compiler

📚 Lessons

1 Arrays & strings

An array is a contiguous block of elements indexed from 0. A C string is a char array ending in a \0 terminator.

int a[3] = {10, 20, 30};
printf("%d\n", a[1]); // 20
char name[] = "Ada";   // {'A','d','a','\0'}

2 Pointers

A pointer holds an address. &x takes the address of x; *p dereferences it. Pointers enable arrays, strings and pass-by-reference.

int x = 5;
int *p = &x;   // p points to x
*p = 99;       // x is now 99

3 Functions & complexity

Functions break problems into reusable units. Choose efficient algorithms: searching a sorted array with binary search is O(log n) versus O(n) for a linear scan. (The example below runs on the simulator.)

#include <stdio.h>

int main() {
    int sum = 0;
    for (int i = 1; i <= 100; i++) sum += i;
    printf("sum 1..100 = %d\n", sum);
    return 0;
}

⚡ C Compiler

Code runs on a learning-oriented simulated runtime that supports common constructs (output, variables, arithmetic, conditionals and loops).

📝 Tasks

5 tasks across 2 pages — multiple-choice and fill-in (type the answer). Score 70% or higher to earn your certificate.

🎓 Certificate of Completion

🔒 Pass the quiz above (70%+) to unlock your downloadable certificate.