1

scanf("%d %d %d", &a,&b,&c);
printf("%f",((a+b+c)/3));

2

scanf("%d", &a);

if((a>0) && ((a%2)==0)){
	printf("par positivo");
}elseif((a<0) && ((a%2)==0)) {
	printf("par negativo");
}elseif((a>0) && ((a%2)==1)) {
	printf("impar positivo");
}elseif((a<0) && ((a%2)==1)) {
	printf("par negativo");
}else{
	printf("nulo");
}

3
a =	1;
c=0;
while(a>0){

	scanf("%d",&a);
	if(a>0){
		b+=a;
		c++;
	}
}
printf("%f",(b/c));

4

scanf("%f",&a));
b=0;
while(b<a){
	c	+=	b;
	b	+=	2;
}
printf("%d",c);

5

for(int b =0;b<10;b++){
	scanf("%f",&a));
	if ((a>10)&&(a<20))	c++;
}

printf("%d",c);

6

scanf("%f",&a));
scanf("%f",&b));
switch (a){
case 3:	printf("%f",(b*b*(1.73/4))); break
case 4:	printf("%f",(b*b)); break
case 6:	printf("%f",(6*b*b*(1.73/4))); break
default: printf("nao sei calcular");
}

7