Program To Perform Logical Operator

#include<stdio.h>
#include<conio.h>
main()
{
int a,b,c;
clrscr();
printf("Enter the value of a,b and c\n");
scanf("%d%d%d",&a,&b,&c);
if((a>b)&&(b>c))
printf("\na is greater than b =%d",a);
else
printf("\nb is greater than a =%d",b);
if(a>c)
printf("\na is greater value than c =%d",a);
else
printf("\nc is greater value than a =%d",c);
if((a==b)||(a==c))
printf("\na value is equal to b");
else
printf("\nvalues are not equal");
getch();
}                 

Program To Perform Relational Operator

#include<stdio.h>
#include<conio.h>
main()
{
int x,y,z;
clrscr();
printf("Enter the values of x,y and z\n");
scanf("%d%d%d,",&x,&y,&z);
if(x==y)
printf("\nBoth the values are same =%d",x,y);
if(x>y)
printf("\nThe value of x is greater =%d",x);
else
printf("\nThe value of y is greater =%d",y);
if(y!=z)
printf("\nThe value of y is not equal to =%d",y);
getch();
}

SWAPPING OF TWO VALUES WITHOUT USING THIRD VARIABLE

#include<stdio.h>
#include<conio.h>
main()
{
int a=8, b=12;
clrscr();
printf("Before swap of two numbers a=%d b=%d\n",a,b);
a=a+b;
b=a-b;
a=a-b;
printf("After swap of numbers a=%d b=%d",a,b);
getch();
}

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);

}