3.3
# include
int main ()
{
int x, y1;
x= 75;
y1= 89;
if (x> 10)
{
int y2 = 50;
y1 = y1+ y2;
}
printf("x = %d, y1 = %d\n",x,y1);
return 0;
}

3.4
# include
int main()
{
char sonidos = '\a';
char bs = '\b';
printf("%c%c",sonidos,sonidos);
printf("zz");
printf("%c%c",bs,bs);
return 0;
}