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# Python: List comprehension magic
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
even_squares = [n ** 2 for n in numbers if n % 2 == 0]
print(even_squares)  # [4, 16, 36, 64, 100]
matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
flat = [num for row in matrix for num in row]
print(flat)  # [1, 2, 3, 4, 5, 6, 7, 8, 9]

/* C: Reverse a string in-place */
#include <stdio.h>
#include <string.h>
void reverse_string(char *str) {
    int left = 0, right = strlen(str) - 1; char temp;
    while (left < right) { temp=str[left]; str[left]=str[right]; str[right]=temp; left++; right--; }
}
int main() {
    char message[] = "Hello, World!";
    printf("Before: %s\n", message); reverse_string(message); printf("After:  %s\n", message); return 0;
}