#include<stdio.h>
main()
{
float a=0 , sum=0 , x;
while(scanf("%f",&x)==1){
if(x<0 || x>10.0){
printf("nota invalida\n");
continue;
}
else{
sum+=x;
a+=1;
if(a==2){
printf("media = %.2f\n",sum/2.0);
break;
}
}
}
}
main()
{
float a=0 , sum=0 , x;
while(scanf("%f",&x)==1){
if(x<0 || x>10.0){
printf("nota invalida\n");
continue;
}
else{
sum+=x;
a+=1;
if(a==2){
printf("media = %.2f\n",sum/2.0);
break;
}
}
}
}
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