C code that removes all occurences of a given value in an integer array in place.

#include <stdio.h>

int removeElement(int* nums, int numsSize, int val) {
    int k = 0;
    for (int i = 0; i < numsSize; i++) {
        if (nums[i] != val) {
            nums[k++] = nums[i];
        }
    }
    return k;
}

int main() {
    int nums[] = {3, 2, 2, 3};
    int val = 3;
    int numsSize = sizeof(nums) / sizeof(nums[0]);
    int k = removeElement(nums, numsSize, val);
    printf("New array size: %d\n", k);
    for (int i = 0; i < k; i++) {
        printf("%d ", nums[i]);
    }
    return 0;
}