Spiral

#include <stdio.h>

int main() {
    int width = 0;
    scanf("%i", &width);
    int upper = width / 2;
    int lower = 0;
    if (width % 2 > 0) {
        lower = upper;
    } else {
        lower = upper - 1;
    }

    for (int i = 0; i < upper; ++ i) {
        for (int j = 0; j < i; ++ j) {
            printf("| ");
        }
        printf("%c ", 218);
        for (int j = 0; j < width - 2 - 2 * i; ++ j) {
            printf("%c ", 196);
        }
        printf("%c ", 191);
        for (int j = 0; j < i; ++ j) {
            printf("| ");
        }
        printf("\n");
    }
    width -= 1;
    for (int i = lower - 1; i >= 0; -- i) {
        for (int j = 0; j < i; ++ j) {
            printf("| ");
        }
        printf("%c ", 192);
        for (int j = 0; j < width - 2 - 2 * i; ++ j) {
            printf("%c ", 196);
        }
        printf("%c ", 217);
        for (int j = 0; j < i; ++ j) {
            printf("| ");
        }
        printf("| ");
        printf("\n");
    }
    for (int j = 0; j < width; ++ j) {
        printf("%c ", 196);
    }
    printf("%c ", 217);

    return 0;
}