PROGRAM TO FIND GEOMETRIC MEAN

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

    int a[10],n,i;

    double sum=0, gm;

    clrscr();

    printf("Enter the total no. of elements");

    scanf("%d",&n);

    printf("Enter the elements\n");

    for(i=0;i<n;i++)

       scanf("%d",&a[i]);

    for(i=0;i<n;i++)

       sum =sum+(log10(a[i]));

    gm=exp(sum/n*log(10));

    printf("Geometric mean is %f",gm);

    getch();

}

PROGRAM TO FIND ARITHMETIC MEAN

#include<stdio.h>

#include<conio.h>

void main()

{

   int a[50],n,i,s;

   float mean;

   clrscr();

   printf("enter how many terms u want to enter\n");

   scanf("%d",&n);

   printf("enter %d terms\n",n);

   for(i=0;i<n;i++)

     scanf("%d",&a[i]);

     s=0;

     for(i=0;i<n;i++)

     s+=a[i];

     mean=s/n;

     printf("mean is %f",mean);

     getch();

}

Program to read name of a employee, employee number and salary from the keyboard and writes same to binary file

#include<stdio.h>

struct employee

{

          int eno,salary;

          char name[20];

}        

main()

{

          struct employee e;

          char ans;

          FILE *fp;

          fp=fopen("file9.out","wb");

          if(fp==NULL)

          {

                   printf("Error in file opening");

                   exit(0);

          }

          do

          {

                   printf("\nEmployee No.");

                   scanf("%d",&e.eno);

                   printf("\nName :");

                   scanf("%s",&e.name);

                   printf("\nSalary");

                   scanf("%d",&e.salary);

                   fwrite(&e,sizeof(e),1,fp);

                   printf("\nDo you want to add more records y/n");

                   ans=getch();

          }while(ans !='n');

          fclose(fp);

}

Program to demonstrate pointer to structure

#include<stdio.h>

main()

{

          struct student

          {

                   int roll;

                   char name[20];

                   int age;

                   char class[8];

          };        

          struct student s,*ptr;

          ptr=&s;

          printf("Enter the student record\n");

          printf("Roll no. :");

          scanf("%d",&ptr->roll);

          printf("Name :");

          scanf("%s",&ptr->name);

          printf("Age:");

          scanf("%d",&ptr->age);

          printf("Class :");

          scanf("%s",&ptr->class);

          printf("\n Record details are\n");

          printf("Roll no: %d\n",ptr->roll);

          printf("Name: %s\n",ptr->name);

          printf("Age: %d\n",ptr->age);

          printf("Class : %s\n",ptr->class);

}

Program to show nesting of macros

#include<stdio.h>

#define SQU(x)((x)*x)

#define CUBE(x)(SQU(x)*x)

int main()

{         

          int x,y;

          clrscr();

          x=SQU(3);

          y=CUBE(3);

          printf("\nSquare of 3 : %d",x);

          printf("\nCube of 3 : %d",y);

          return(0);

}

Program to demonstrate pointer to function

#include<stdio.h>

main()

{

          void mess();

          void (*ptr)();

          ptr=mess;

          clrscr();

          printf("Address of the function is %d\n",ptr);

          (*ptr)();

}             

      void mess()

      {

          printf("I am in the subprogram\n");

      }

Program to demonstrate enumerated data types.

#include<stdio.h>

enum month {Jan,Feb,Mar,Apr,May,June,July,Aug,Sep,Oct,Nov,Dec,Next};

main()

{

          int m;

          float pay,sum=0;

          printf("\n");

          for(m=Jan;m<=Dec;m++)

          {

                   printf("Enter the pay of month %d :",m+1);

                   scanf("%f",&pay);

                   sum+=pay;

          }

          printf("Total Salary =%f",sum);

}

Program to demonstrate dynamic memory allocation

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

main()

{

          char *mem_allocation;

          clrscr();

          mem_allocation= malloc( 20* sizeof(char));

          if(mem_allocation==NULL)

          {

           printf("couldn't able to allocate requested memory\n");

          }

          else

          {

                   strcpy(mem_allocation,"Besties");

      }

      printf("Dynamically allocated memory                                  content:""%s",mem_allocation);

           free(mem_allocation);

}

Program to demonstrate use of #define

 #include<stdio.h>

#define NAME "vokytoky"

#define AGE 15

int main()

{       clrscr();

          printf("%s is over %d years old.\n",NAME,AGE);

          return 0;

}

Program to demonstrate conditional compilation.

#include<stdio.h>

int main()

{              

          int i=2;

          clrscr();

          #ifdef DEF

          {

                   i*=i;

          }

          #else

          {

                   printf("The answer is %d\n",i);

          }

          #endif

          return 0;

}

Program to demonstrate array of strings

#include<stdio.h>

#include<string.h>

void main()

{                  

          char name[35][21];

          int n,i;

          clrscr();

          printf("Enter numbers of students");

          scanf("%d",&n);

          printf("Enter the %d students name\n",n);

          for(i=0;i<=n;++i)

          {

                   gets(name[i]);

          }

     printf("\n List of students is");

          for(i=0;i<=n;++i)

          puts(name[i]);

}