void setup() {
Serial.begin(9600); 
}
void loop()  
{
int analog = analogRead(A0);
float MV = (analog/1024.0) * 5000; //5000 is the voltage provided
float celsius = MV/10;
Serial.print("In Degree Celsius= ");
Serial.println(celsius);
delay(1000);
}

while statement

The syntax for while statement:

while(expression)
{

            statement 1;

            statement 2;

            statement 3;
} 

 Program 2: To find factorial of a given number

#include<stdio.h>
int main()
{
     int n,num;
     long long fact;
     printf("Enter a number\n");
     scanf("%d",&num);
     n=num;
     fact=1;
     if(num&gt0)
         printf("Factorial of negative number is not possible\n");
     else
     {
         while(num>1)
         {
              fact = fact * num;  //fact*=n;
              num--;
         }
         printf("The factorial of a number %d is %lld\n",n,fact);
     }
}

#include<stdio.h>
int main()
{
        int x=50,y=70;
        if(x<y)
   {
      printf("y is greater than x\n");
   }
} 

#include<stdio.h>
int main()
{
        int x=50,y=70;
   if(x>y);
   {
      printf("y is greater than x\n");
   }
} 

if ... else Statement

The general form of if .. else statement is

#include<stdio.h>
int main()
{
        if(test condition)
        {
                body of if statement
        }
        else
        {
                body of else statement
        }

}

#include<stdio.h>
int main()
{
        int x=10,y=20;
        if(x<y)
        {
                printf("x is less than y\n");
        }
        else
        {
                printf("y is less than x\n");
        }
}

#include<stdio.h>
int main()
{
        if(1)
        {
                printf("This is if part\n");
        }
        else
        {
                printf("This is else part\n");
        }

}

#include<stdio.h>
int main()
{
        if(0)
        {
                printf("This is if part\n");
        }
        else
        {
                printf("This is else part\n");
        }

}

            An operator is used to tells the compiler to perform specific mathematical or logical manipulation. Operators are used in the program to manipulate data and variables. The operator needs operand. An operand is a data item on which an operator acts. The operand may be one or more than one. At least one operand is required. 

1.  Arithmetic Operators 
2. Relational Operator
3.  Logical Operators
4. Comma Operator
5.  Bitwise Operators
6. sizeof Operators
7. Increment and Decrement Operators
8. Assignment Operators
9. Conditional Operators

1. Arithmetic Operators 

A. Unary Arithmetic Operator  

B. Binary Arithmetic Operator

#include<stdio.h>
main()
{
        float a,b;
        printf("Enter value of a and b\n");
        scanf("%f %f",&a,&b);
        printf("Addition is=%f\n",a+b);         //Print result of addition
        printf("Subtraction is=%f\n",a-b);      //Print result of subtraction
        printf("Multiplication is=%f\n",a*b);   //Print result of multiplication
        printf("Division is=%f\n",a/b);         //Print result of division
        return 0;
}

         The above example shows how Binary Arithmetic Operators are used. The output for the above program is

2. Relational Operators

            Relational operators are used to comparing the values of two operators. These operators compare two values and result in one of two possible outcomes either true or false. It can compare character values or numeric values. Relational operators are as below.

Operator	Meaning
<	Less than
<=	Less than or equal to
==	Equal to
!=	Not equal to
>	Greater than
>=	Greater than or equal to

          This Relational operator always returns a value 0 or 1 only. Let us consider following program for better understanding.

#include <stdio.h>
main()
{
        int a=5,b=7,c=10,e=5;

        printf("%d<%d=%d,%d<%d=%d\n",a,b,a<b,c,e,c<e);
        printf("%d<=%d=%d,%d<=%d=%d\n",a,b,a<=b,c,e,c<=e);
        printf("%d==%d=%d,%d==%d=%d\n",a,e,a==e,c,b,c==b);
        printf("%d!=%d=%d,%d!=%d=%d\n",a,e,a!=e,c,b,c!=b);
        printf("%d>%d=%d,%d>%d=%d\n",a,b,a>b,c,e,c>e);
        printf("%d>=%d=%d,%d>=%d=%d\n",a,e,a>=e,c,b,c>=b);
        return 0;

}

Program For Basic Mathematical Operations

Method 1:

Method 2:

#include<stdio.h>
main()
{
        float a,b;
        printf("Enter value of a and b\n");
        scanf("%f %f",&a,&b);
        printf("Addition is=%f\n",a+b);         //Print result of addition
        printf("Subtraction is=%f\n",a-b);      //Print result of subtraction
        printf("Multiplication is=%f\n",a*b);   //Print result of multiplication
        printf("Division is=%f\n",a/b);         //Print result of division
        return 0;
}

Program For Find Entered Number is Even Number Or Odd Number

#include<stdio.h>
main()
{
     int number;
     printf("Enter an integer: \n");
     scanf("%d", &number);
     if(number % 2 == 0)
         printf("%d is even.\n", number);   //if condition is true
     else
         printf("%d is odd.\n", number);   // if condition is false
     return 0;
}