How to find Arithmetic mean of Continuous series in C programming?

Arithmetic mean of Continuous series in C programming

// Here, ll = lowerLimit
// cl = classLimit
// nc = class length
// sf = sum of frequency
// f = frequency
// am = assumed  mean
#include<stdio.h>
#include<conio.h>
int i,j,ll,up,cl,nc,l[100],u[100],f[100],sf,am;
float x[100],fx[100],sfx,fd[100],d[100],sfd,sfv,v[100],fv[100];
void getdata()
{
            printf("Enter the lower limit: ");
            scanf("%d",&ll);
            printf("Enter the class length: ");
            scanf("%d",&cl);
            printf("Enter the total number of class: ");
            scanf("%d",&nc);
          
            for(i=0;i<nc;i++)
            {
                        up=ll+cl;
                        l[i]=ll;
                        u[i]=up;
                        ll=up;
                        x[i]=((float)l[i]+(float)u[i])/2;
            }
            for(i=0;i<nc;i++)
            {
                        printf("Enter the frequency for class %d-%d: ",l[i],u[i]);
                        scanf("%d",&f[i]);
            }
}
void direct()
{
            sf=0;
            sfx=0;
            for(i=0;i<nc;i++)
            {
                        sf+=f[i];
                        fx[i]=x[i]*f[i];
                        sfx+=fx[i];
            }
            printf(" ");
            for(i=0;i<30;i++)
            printf("-");
            printf(" Class Xi Fi FiXi ");
            for(i=0;i<nc;i++)
            printf("%d-%d %.2f %d %.2f ",l[i],u[i],x[i],f[i],fx[i]);
            for(i=0;i<30;i++)
            printf("-");
            printf(" Total %d %.2f",sf,sfx);
            printf(" The sum of Fi is: %d",sf);
            printf(" The sum of FiXi is: %.2f",sfx);
            printf(" The mean is : %.4f",sfx/sf);
}
void shortcut()
{
            sf=0;
            sfd=0;
            printf("Enter the assumed mean: ");
            scanf("%d",&am);
            for(i=0;i<nc;i++)
            {
                        d[i]=x[i]-am;
                        fd[i]=f[i]*d[i];
                        sf+=f[i];
                        sfd+=fd[i];
            }
            for(i=0;i<40;i++)
            printf("-");
            printf(" Class Xi Di Fi FiDi ");
            for(i=0;i<nc;i++)
            printf("%d-%d %.2f %.2f %d %.2f ",l[i],u[i],x[i],d[i],f[i],fd[i]);
            for(i=0;i<40;i++)
            printf("-");
            printf(" Total %d %.2f",sf,sfd);
            printf(" The assumed mean is: %d",am);
            printf(" The sum of FiDi is: %.2f",sfd);
            printf(" The sum of Fi is: %d",sf);
            printf(" The mean is : %.4f",am+(sfd/sf));
}
          void step()
          {
                      sf=0;
                      sfv=0;
                      printf("Enter the assumed mean: ");
                      scanf("%d",&am);
                      for(i=0;i<nc;i++)
                      {
                                  v[i]=(x[i]-am)/cl;
                                  fv[i]=f[i]*v[i];
                                  sf+=f[i];
                                  sfv+=fv[i];
                      }
            for(i=0;i<40;i++)
            printf("-");
            printf(" Class Xi Ui Fi FiUi ");
            for(i=0;i<nc;i++)
            printf("%d-%d %.2f %.2f %d %.2f ",l[i],u[i],x[i],v[i],f[i],fv[i]);
            for(i=0;i<40;i++)
            printf("-");
            printf(" Total %d %.2f",sf,sfv);
            printf(" The assumed mean is: %d",am);
            printf(" The sum of FiUi is: %.2f",sfv);
            printf(" The sum of Fi is: %d",sf);
            printf(" The class lenght is: %d",cl);
            printf(" The mean is : %.4f",am+((sfv/sf)*cl));
}
void main()
{
            int choice;
            while(1)
            {
                      clrscr();
                      printf("The Mean for Continous Distribution ");
                      printf("1.Direct Method 2.Shortcut Method 3.Step Deviation Method 0.Exit ");
                      printf(" Enter your choice: ");
                      scanf("%d",&choice);
 
  switch(choice)
  {
              case 1:
              getdata();
              direct();
              break;
              
               case 2:
               getdata();
               shortcut();
               break;
              
                case 3:
                getdata();
                step();
                break;
              
                case 0:
                exit(0);
                getch();
                break;
                
                 default:
                printf("Enter valid choice!");
                break;
                 }
                    getch();
          }
}

Output: