Write a c program to generate X-Chart in statistic

How to write C program to generate X-Chart in statistic.

C Program to generate X-Cahrt in Statistic

#include<conio.h>
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#define A2 .577

void direct();
void indirect();

int num, x[50], r[50], i;
float x_m=0.0, X_m, r_m=0.0, R_m, ucl, lcl;


void main()
{
     int ch;
     clrscr();

     while(ch!=5)
     {
          printf("\nenter your choice ");
          printf("\npress 1 for direct mean of sampling and range are given ");
          printf("\npress 2 for finding mean of sampling and range ");
          printf("\npress 3 for exit ");
          printf("\n");
          scanf("%d",&ch);
          switch(ch)
          {
               case 1 :
                    direct();
                    break;

               case 2 :
                    indirect();
                    break;

               case 3 :
                    exit(0);
                    break;
               default :
                       printf("\nu enter wrong choice \n");
                       break;
          }
     }
getch();
}

void direct()
{
     printf("\n enter the value of mean of all given mean i.e. X bar ka bar = ");
     scanf("%f",&X_m);
     printf("\n enter the value of mean of all given ranges i.e. R bar = ");
     scanf("%f",&R_m);
     ucl=X_m+(A2*R_m);
     lcl=X_m-(A2*R_m);
     printf("\nthe value of central line X_m =  %.3f",X_m);
     printf("\nthe value of upper control limit ucl =  %.3f",ucl);
     printf("\nthe value of lower control limit lcl =  %.3f\n",lcl);
}


void indirect()
{
     printf("\n enter the no of samples  = ");
     scanf("%d",&num);
     printf("\n enter the values of mean  \n");
     for(i=0;i<num;i++)
     {
          scanf("%d",&x[i]);
     }
     printf("\n enter the values of ranges  \n");
     for(i=0;i<num;i++)
     {
          scanf("%d",&r[i]);
     }
     for(i=0;i<num;i++)
     {
          x_m=x_m+x[i];
     }

     for(i=0;i<num;i++)
     {
          r_m=r_m+r[i];
     }
     X_m=(float)x_m/num;
     R_m=(float)r_m/num;

     ucl=X_m+(A2*R_m);
     lcl=X_m-(A2*R_m);

     printf("\nthe value of central line X_m =  %.3f",X_m);
     printf("\nthe value of upper control limit ucl =  %.3f",ucl);
     printf("\nthe value of lower control limit lcl =  %.3f\n",lcl);
}