#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>

#define RANGE 100
#define BUF_LENGTH 255

int main(int argc, char** argv) {

    char buffer[BUF_LENGTH];
    int attempt = 0;

    /* seed random generator */
    srandom(time(NULL));

    int number = (random() % RANGE) + 1;

    for (;;) {
        attempt++;
        printf("Bitte geben Sie eine Zahl im Bereich 1-%d ein: ", RANGE);
        int guess = 0;

        memset(buffer, 0, BUF_LENGTH);

        if (fgets(buffer, BUF_LENGTH - 1, stdin) != 0) {
            sscanf(buffer, "%d", &guess);
            /* Alternative zu sscanf
            char* newline = strchr(buffer, '\n');
            if (newline) {
                *newline = '\0';
            }
            guess = atoi(buffer);
            */
        }

        if (guess < 1 || guess > RANGE) {
            continue;
        }

        if (guess < number) {
            puts("Zu klein");
        }
        else if (guess > number) {
            puts("Zu groß");
        }
        else {
            printf("Richtig nach %d Versuchen.\n", attempt);
            break;
        }
    }

    return 0;
}