uri-1118 - Several Scores with Validation

#include <stdio.h>


int main(){

     int i;
    float x, y, z, n;
    y = 0;
    z = 0;
    n = 0;
    for(i=0;i<100000;i++){
                scanf("%f",&x);
                if(n == 1){

                if(x == 2){
                     break;
                }else if(x == 1){
                       n = 0;
                       continue;
                }
                else{
                     printf("novo calculo (1-sim 2-nao)\n");
                     continue;
                     }
                }else{
                if(x < 0 || x > 10){
                      printf("nota invalida\n");
                      }
                else if(z == 0){
                      y = x;
                      z = 1;
                }
                else{
                     printf("media = %.2f\n", (x+y)/2.00);
                     z = 0;
                     n = 1;
                }
                }

                if(n == 1)
                    printf("novo calculo (1-sim 2-nao)\n");

    }
    return 0;
}