C program to make a calculator using the switch statement.

/*perform arithmetic calculation on integers in C language*/

#include<stdio.h>

#include<conio.h>

void main()

{

    char op;

    int a, b;

    printf("enter an Operator = ");

    scanf("%c",&op);

     printf("enter first number in = ");

    scanf("%d",&a);

     printf("enter second number in = ");

    scanf("%d",&b);

    switch(op)

    {

        case '+':

        printf("Result is = %d\n", a+b);

        break;

         case '-':

        printf("Result is = %d\n", a-b);

        break;

         case '*':

        printf("Result is = %d\n", a*b);

        break;

         case '/':

        printf("Result is = %d\n", a%b);

        break;

        default:

         printf("Oops TRY AGAIN!!!");

    }

        getch();

        

    }

Output:

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check whether a given number is even or odd? If the number is an even number, print it's square.

C program to check whether a given number is even or odd? if the number is even number, print it's square...

#include<stdio.h>
#include<conio.h>
void main()
{
    int num, squ;
    printf("enter number = ");
    scanf("%d",& num);
    if(num%2==0)
       { 
           printf("The number is Even");
           squ = num*num;
           printf("\nsquare of this even number is %d", squ);
       }
          
    else 
         printf("The number is Odd");
         
    getch();


}
Output:

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Switch Versus if-else Ladder

Q. What is the difference between the Switch statement and if- else ladder statements?

S.No.	Switch statement	If- else-if ladder statements
	Instead of using the if-else-if Ladder control statement, the Switch Statement is available in program C for Handling multiple choices. In Switch statement three keywords are used switch, case, and default. we can use integer. constant. but we can not use floating point and string constants.	This is a type of nesting in which there is an if...else statement in every else part except the last else part. This type nesting is called the else if Ladder Statement.
	Syntax: Switch(expression) {   case constant 1:   statement;   break;   case constant 2:   statement;   break;   case constant 3:   statement;   break;   default;   statement }	Syntax: if(Condition 1)        Statement A; else if(Condition 2)          Statement B;  else if(Condition 3)               Statement C;   else if(Condition 4)                 Statement C;        else                  Statement D;
3.	It’s also called cases control statement.	It’s also called loader if statement.
4.	In switch statements we use switch keyword.	Here we use else if keywords.
5.	It is easy to use & understand.	It is complex statements.
6.	It can have different cases for different conditions.	But there is no different cases for different conditions.
7.	In this statement, we can not use relational & logical operators.	In this we can use relational & logical statements.
8.	#include<stdio.h> #include<stdio.h> void main() {      int ch;     printf("\n1. press ch=1 for monday. \n2. press ch=2 for tuesday.\n3. press ch=3 for wednesday. \n4.press ch=4 for thursday. \n5.press ch=5 for friday.\n6.press ch=6 for saturday. \n7. press ch=7 for sunday.");       printf("\n enetr your choice =");     scanf("%d", &ch);      switch(ch)      {           case 1:         printf("today is monday");         break;                  case 2:         printf("today is tuesday");         break;                  case 3:         printf("today is wednesday");         break;            case 4:         printf("today is thursday");         break;                  case 5:         printf("today is friday");         break;            case 6:         printf("today is saturday");         break;                  case 7:         printf("today is sunday");         break;                  default:         printf("wrong choice Try Again!!!");      }              getch();   }   Output: Click Here, Switch Statement	#include<stdio.h> #include<stdio.h> void main() {     int ch;          printf("\n1. press ch=1 for monday. \n2. press ch=2 for tuesday.\n3. press ch=3 for wednesday. \n4.press ch=4 for thursday. \n5.press ch=5 for friday.\n6.press ch=6 for saturday. \n7. press ch=7 for sunday.");     printf("\n enetr your choice =");     scanf("%d", &ch);     if(ch==1)     {         printf("today is monday");     }   else if(ch==2)     {        printf("today is tuesday");     }  else if(ch==3)     {        printf("today is wednesday");     }  else if(ch==4)     {         printf("today is thursday");     }   else if(ch==5)     {         printf("today is friday");     }   else  if(ch==6)     {         printf("today is saturday");     }   else if(ch==7)     {         printf("today is sunday");     }     getch();      } Output:     Click Here, else-if Ladder

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Check whether the Alphabet is a Vowel or Consonant

/*Program to find whether the alphabet is a vowel or consonant.*/

#include<stdio.h>

#include<conio.h>

void main()

{

    char ch;

    printf("enter an alphabet : ");

    scanf("%c",& ch);

    switch(ch)

    {

        case 'a':

        case 'e':

        case 'i':

        case 'o':

        case 'u':

        printf("Alphabet is a Vowel\n");

        break;

        default:

        printf("Alphabetis a Consonant\n");

        getch();

    }

}

Output:

Click Here, Switch Statement

C Program to Print Day Name of Week using Switch Statements

#include<stdio.h>

#include<stdio.h>

void main()

{

     int ch;

    printf("\n1. press ch=1 for monday. \n2. press ch=2 for tuesday.\n3. press ch=3 for wednesday. \n4.press ch=4 for thursday. \n5.press ch=5 for friday.\n6.press ch=6 for saturday. \n7. press ch=7 for sunday.");

    printf("\n enetr your choice =");

    scanf("%d", &ch);

   

 switch(ch)

     {

        case 1:

        printf("today is monday");

        break;

        

        case 2:

        printf("today is tuesday");

        break;

        

        case 3:

        printf("today is wednesday");

        break;

  

        case 4:

        printf("today is thursday");

        break;

        

        case 5:

        printf("today is friday");

        break;

  

        case 6:

        printf("today is saturday");

        break;

        

        case 7:

        printf("today is sunday");

        break;

        

        default:

        printf("wrong choice Try Again!!!");

     }

        

    getch();

}

Output:

Click Here, C Program to Print Day Name of Week using Else If ladder

Click Here, Switch Statements

The Switch Statement

Instead of using the if-else-if Ladder control statement, the Switch Statement is available in program C for Handling multiple choices. In Switch statement three keywords are used switch, case, and default.we can use integer. constant. but we can not use floating point and string constants.

Syntax:

Switch(expression)

{

  case constant 1:

  statement;

  break;

  case constant 2:

  statement;

  break;

  case constant 3:

  statement;

  break;

  default;

  statement

}

Flowchart:

Example:

#include<stdio.h>

#include<conio.h>

void main()

{

    int ch;

    printf("\nenter 1 for print red \nenter 2 for print blue  \nenter 3 for print green \nenter your choice");

    scanf("%d",& ch);

    

    switch(ch)

    {

        case 1:

        printf("red");

        break;

        

         case 2:

        printf("blue");

        break;

        

         case 3:

        printf("green");

        break;

        

        default:

        printf("wrong choice try again!");

        getch();

    }

}

    

Output:

    Here, you can See  the choice that is given by user is matched, one by one, when a match is found, the program executes the statements following case, and all subsequent case and default statement as well. If no match is found with any of the case statements, only the default statement is executed. 

Control Statement: else if ladder

C Program to Print Day Name of Week using Else If ladder

What is Scope of Global and Local Variable in C ?

Local Variable:-  The variables that defined within the body of a function or a block, are called local variable. In simple words, The scope of  a local variable is limited to the function in which it is defined. 

Syntax:
function(a, b)
int a, b;
{
int x, y;   /*Local Variable*/
/*body of the function*/
}
Example:
#include<stdio.h>
#include<conio.h>
  void main()
{
  int a, b, sum; /*Local Variable*/

/* Printf() outputs the values to the screen whereas scanf() receive them from the keyboard.   and  &   is a address used in scanf(). */

 printf("enter  first no=");
  scanf("%d", & a);
  printf("enter second no=");
  scanf("%d", & b);
  sum= a+b;
  printf("Sum of two number is =%d",sum);
  getch();
}

Output:

Global Variable:- Global Variable are defined outside the main() function block. All functions in the program can access and modify global variables. Its's very useful if it is to be used by many functions in the program. this variables are automatically initialized by 0 at the time of declaration.

Syntax: 
int x, y; /*Global Variable*/
main()
{
x=5;
function1();
}
function1();
{
int sum;
sum=x+y;
}

Example:
#include<stdio.h>
#include<conio.h>
int sum;  void main()
{
  int a, b; /*Local Variable*/

/* Printf() outputs the values to the screen whereas scanf() receive them from the keyboard.   and  &   is a address used in scanf(). */

 printf("enter  first no=");
  scanf("%d", & a);
  printf("enter second no=");
  scanf("%d", & b);
  sum= a+b;
  printf("Sum of two number is =%d",sum);
  getch();
}

Output:

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c.