C++語法--(未完成)

#include
int main()
{
int counter,num1,num2,sum,avg,max,min;
int area1=0,area2=0,area3=0,area4=0,area5=0,area6=0,area7=0,area8=0,area9=0,area0=0;


counter=0;
max=0;
min=100;
printf("Please enter a number :");
scanf("%d",&num1);

sum=0;
while(counter< num1)
{
printf("Enter the number smaller than 100-->");
scanf("%d",&num2);
counter=counter+1;

sum=sum+num2;


if(num2>max)
{
max=num2;
}

if(num2 {
min=num2;
}


if(0 {
area0=area0+1;
}
else if(num2<20)
{
area1=area1+1;
}
else if(num2<30)
{
area2=area2+1;
}
else if(num2<40)
{
area3=area3+1;
}
else if(num2<50)
{
area4=area4+1;
}
else if(num2<60)
{
area5=area5+1;
}
else if(num2<70)
{
area6=area6+1;
}
else if(num2<80)
{
area7=area7+1;
}
else if(num2<90)
{
area8=area8+1;
}
else if(num2<100)
{
area9=area9+1;
}
}

printf("0-10");
while(0 {
printf("*");
area0=area0-1;
}

printf("avg=%d\n",sum/num1);
printf("max=%d\n",max);
printf("min=%d\n",min);










return 0;

}