85. Circular Buffer Insert

#include <stdio.h>

typedef struct {
    int buffer[100];
    int head;
    int tail;
    int count;
    int capacity;
} CircularBuffer;

void insert_circular(CircularBuffer *cb, int value) {
    // Your logic using only pointer access
    //if(cb->tail==cb->count-1&& cb->head==0)
    if(cb->count!=cb->capacity){
    if(cb->head==-1 && cb->tail==-1) cb->head=cb->tail=0;
    else if((cb->tail==(cb->capacity)-1)&&(cb->head!=0)) cb->tail=0;
    else cb->tail=cb->tail+1;
    cb->buffer[cb->tail]=value;
    cb->count++;}
}

int main() {
    int n, k;
    scanf("%d %d", &n, &k);

    CircularBuffer cb = { .head = -1, .tail = -1, .count = 0, .capacity = n };

    for (int i = 0; i < k; i++) {
        int val;
        scanf("%d", &val);
        insert_circular(&cb, val);
    }

    for (int i = 0; i < cb.count; i++) {
        printf("%d", cb.buffer[i]);
        if(i < cb.count-1){
           printf(" "); 
        }
    }

    return 0;
}