int a,b,c,d,sum,multiple;
double avg,hermonicmean;
printf("plz enter  four Positive numbers:");
scanf("%d %d %d %d", &a, &b, &c, &d);
sum = a+b+c+d;
multiple=a*b*c*d;
avg=(sum)/4 ;
hermonicmean=(4)/((1/a)+(1/b)+(1/c)+(1/d));
printf("%d %d %.2f %.2f" , sum, multiple, avg, hermonicmean);
return 0;
}