C function to reverse an array of integers

Question

Write a C program that reverses an array of integers.

Answer 1

#include <stddef.h> // for size_t

// Function to reverse an array, with overflow protection

void reverseArray(int arr[], size_t size) {

int temp;

for (size_t i = 0; i < size / 2; ++i) {

// Swap elements to reverse array

temp = arr[i];

arr[i] = arr[size - i - 1];

arr[size - i - 1] = temp;

}

}

In this modified version, I used size_t (from stddef.h) for the array size and loop variable, which is the idiomatic type for array sizes and indices in C.

Note that while size_t protects against some kinds of overflow, this change doesn't protect against overflows that could result from incorrect usage of the function itself (e.g., passing an array that isn't as large as size). Always be sure that the size parameter accurately reflects the true size of the array to prevent such overflows.