#include <stdio.h>
#include <stdint.h>
#include <string.h>

int scanloop(const char *str, void *var) {
    int ret, ptrval;
    char buffer[1024];
    if(!strcmp(str, "%d")) {
        ptrval = 0;
    } else if (!strcmp(str, "%f")) {
        ptrval = 1;
    } else {
        return -1;
    }
    do {
        if (ptrval) {
            ret = scanf(str, (int *) var);
        } else {
            ret = scanf(str, (float *) var);
        }
        if (ret!=1) {
            scanf("%s", &buffer);
            printf("FUCK YOU TRY AGAIN: ");
        }
    } while(ret!=1);
    return 0;
}

//Fuck ya, main function
int main(int argc, char **argv) {
    int32_t start, end; //stdints mothafucka
    float gas; //Awww shit, declaring a float
    printf("How much gas was used: "); //No puts here nignog
    scanloop("%f", &gas); //EVERYONE GET DOWN USER INPUT INCOMING
    printf("Odometer at start: "); //Oh hey more printf
    scanloop("%d", &start); //NOT THIS SHIT AGAIN
    printf("Odometer at end: "); //I'm on to you
    scanloop("%d", &end); //I FUCKING KNEW IT
    printf("%fl/km\n", (gas/(end-start))); //Here's your shit, get out
    return 0; //I'm done with this shit
}