Array Examples

Simple Example

#include <conio.h>
#include <stdio.h>
#include <math.h>
#define TALMID_SIZE  4
void main()
{
    int i;
    int  talmid[TALMID_SIZE];
    float average,sd ;
    clrscr();
     
     read grades and compute average                
     
    printf ("Enter %d grades\n\n",TALMID_SIZE  -  1);
    average=0.0;
    for (i=1 ; i<TALMID_SIZE; i++)
      {
         printf("%d==>  ",i);
         scanf("%d",&talmid[i]);
         average += talmid[i];
      }
     average/=float(TALMID_SIZE - 1);
     printf("\n%f",average  );
       /*-----------------------------------------*/
       /*   compute  standard deviation           */
       /*-----------------------------------------*/
    sd=0.0;
    for (i=1 ; i<TALMID_SIZE; i++)
        sd +=(talmid[i]-average)*(talmid[i]-average);
    sd=sqrt(sd/float(TALMID_SIZE - 1 ));
    printf ("\nthe standard deviation is==>%2.3f",sd);
}

Standard Dev.

#include <conio.h>
#include <stdio.h>
#include <math.h>
#define TALMID_SIZE  4
 
float sd( int [],int);
 
void main()
{
    int i;
    int  talmid[TALMID_SIZE];
    clrscr();
     
     read grades                 
     
 
    printf ("Enter %d grades\n\n",TALMID_SIZE  -  1);
    for (i=1 ; i<TALMID_SIZE; i++)
      {
         printf("%d==>  ",i);
         scanf("%d",&talmid[i]);
      }
 
    printf("\nthe standard deviation is==>%2.3f",sd(talmid,TALMID_SIZE));
}
 
 standard deviation function              
 
float sd(int v[],int v_size)
{
    float a,s;
    int i;
    a=0.0;
    for (i=1 ; i<v_size; i++)
         a +=  v[i];
    a/=float(v_size - 1);
       
 
          compute  standard deviation           
    s=0.0;
    for (i=1 ; i<v_size; i++)
        s +=(v[i]-a)*(v[i]-a);
    s=sqrt(s/float(v_size - 1 ));
    return s;
}

Days in month

#include <conio.h>
#include <stdio.h>
 
int days_in_month(int,int);
 
void main()
{
    int m,y;
    clrscr();
    printf("enter  month  year==>");
    scanf("%d %d",&m,&y);
    printf(" %d",days_in_month(m,y)) ;
}
 
 
   compute no of days in a month       
 
 
int days_in_month(int month , int year)
{
     int v[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
     if( month!=2 )
     return v[month];
     else if(  (year % 4) == 0  )
         return 29;
      else return 28;
}

Vertical histogram

#include <conio.h>
#include <stdio.h>
#define  TALMID_SIZE 20
void main()
{
    int i,j;
    int talmid[TALMID_SIZE],talmid_no_of_stars[TALMID_SIZE];
    clrscr();
     
      read grades and compute no of stars          
     
 
    printf ("Enter %d grades\n\n",TALMID_SIZE  -  1);
    for (i=1 ; i<TALMID_SIZE; i++)
      {
         printf("%d==>  ",i);
         scanf("%d",&talmid[i]);
         if (talmid[i] <=54)
            talmid_no_of_stars[i]=1 ;
         else
            talmid_no_of_stars[i]=talmid[i]/5   - 9;
      }
 
     
       print   histogram                            
     
    for(j=11;j>0 ; j--)
    {
        printf("\n");
        for (i=1 ; i<TALMID_SIZE; i++)
        {
          if (talmid_no_of_stars[i] >=j )
              printf("* ");
          else printf("  ");
        }
    }
}