# Write a C program to generate NP-chart in statistics

How to write a C program for NP – chart of control limit for statistical

/* wap to computing the control limits of NP-chart */

## C program to generate NP-chart

#include<conio.h>
#include<stdio.h>
#include<math.h>
#include<stdlib.h>

void direct();
void indirect();

long int I_num, S_num, num, i,  D_num;
long int dfct=0, d[50];
float cl, ucl, lcl, z, p ;

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

while(ch!=5)
{
printf("\npress 1 for direct value of p-bar is given ");
printf("\npress 2 for finding central line ");
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 p-bar = ");
scanf("%f",&p);

printf("\n enter the total no of items in each sample = ");
scanf("%ld",&I_num);

cl=p*I_num;

z=cl*(1-p);

z=sqrt(z);
ucl=cl+3*z;
lcl=cl-3*z;
if(lcl<0)
lcl=0;
printf("\nthe value of central line cl =  %.3f",cl);
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 total no of samples inspected = ");
scanf("%ld",&S_num);

printf("\n enter the total no of items in each sample = ");
scanf("%ld",&I_num);

printf("\n enter the total no of defective of all samples inspected = ");
scanf("%ld",&D_num);
printf("\n enter the no of defectives in samples one by one \n");
for(i=0;i<D_num;i++)
{
scanf("%ld",&d[i]);
}
for(i=0;i<D_num;i++)
{
dfct=dfct+d[i];
}
p=(float)dfct/(S_num*I_num);

cl=p*I_num;

z=cl*(1-p);
z=sqrt(z);
ucl=cl+3*z;
lcl=cl-3*z;
if(lcl<0)
lcl=0;
printf("\nthe value of central line cl =  %.3f",cl);
printf("\nthe value of upper control limit ucl =  %.3f",ucl);
printf("\nthe value of lower control limit lcl =  %.3f\n",lcl);

}