Conditional Statements

Switch Statements

It is used to check a variable/ expression for different values.
According to value of the variable different cases are executed i. e. program control enters switch block at different points.
If no matching case is found then code in the default block is executed.
Default block is optional.
We can use a break statement to throw program control out of a switch otherwise statements of next case will be executed without checking their values.
In switch statement we can check values of type int and chars only i.e. we cannot check values of type float or double.
In switch case values must be constant literals i.e. it cannot be variables or expressions.

Syntax:

switch(variable)
{ 
case value: 
		---------
		---------
		break;
case value: 
		---------
		---------
		break;
.
.
default:
            ---------
		---------     

}

#Write a program to read Single digit number and print it in word.

  #include⁢stdio.h>
  main()
  {
    int a;
    printf("Enter a single digit number");
    scanf("%d",&a);
    switch(a)
    {
        case 0: printf("Zero");break;
        case 1: printf("One");break;
        case 2: printf("Two");break;
        case 3: printf("Three");break;
        case 4: printf("Four");break;
        case 5: printf("Five");break;
        case 6: printf("Six");break;
        case 7: printf("Seven");break;
        case 8: printf("Eight");break;
        case 9: printf("Nine");break;
        default : printf("Not a single digit number");
    }
  }

Enter a single digit number 7 
Seven

#Write a program to read month in digits and print it in words.

  #include⁢stdio.h>
  main()
  {
    int a;
    printf("Enter month in digit ");
    scanf("%d",&a);
    switch(a)
    {
        case 1 : printf("Jan");break;
        case 2 : printf("Feb");break;
        case 3 : printf("March");break;
        case 4 : printf("April");break;
        case 5 : printf("May");break;
        case 6 : printf("June");break;
        case 7 : printf("July");break;
        case 8 : printf("Aug");break;
        case 9 : printf("Sept");break;
        case 10 : printf("Oct");break;
        case 11 : printf("Nov");break;
        case 12 : printf("Dec");break;
        default : printf("Invalid Month");
    }
  }

Enter month in digit 3
March

#Write a program to read color code i.e. a char value and print output according to given criteria [ r-red, g-green, b-blue, any other char-white].

  #include⁢stdio.h>
  main()
  {
    char a;
    printf("Enter Color Code ");
    scanf("%c",&a);
    switch(a)
    {
        case 'R' :
        case 'r' : printf("Red");
                   break;
        case 'G' :
        case 'g' : printf("Green") ;
                   break;
        case 'B' :
        case 'b' : printf("Blue");
                   break;
        default : printf("White") ;
    }
  }

Enter Color Code g 
Green

#Write a program to read simple expression and calculate result according to operator.

  #include⁢stdio.h>
  main()
  {
    float a,b,c;
    char o;
    printf("Enter simple Exp. : ");
    scanf("%f %c %f",&a,&o,&b);
    switch(o)
    {
        case '+': c=a+b;break;
        case '-': c=a-b;break;
        case '*': c=a*b;break;
        case '/': c=a/b;break;
    }
    printf("= %f",c);
  }

Enter simple Exp: 2.4 + 7.1
= 11.5

#Write a program to read temp value in range 0 to 99 and print output according to given criteria:
0-19 : cold
20-39 : normal
40-59 : warm
60-79 : hot
80-99 : very hot
Otherwise - invalid input.

  #include⁢stdio.h>
  main()
  {
    int n;
    printf("Enter temp in range 0-99:");
    scanf("%d",&n);
    switch(n/20)
    {
        case 0: printf("Cold"); break;
        case 1: printf("normal"); break;
        case 2: printf("warm"); break;
        case 3: printf("hot"); break;
        case 4: printf("very hot");break; 
    }
  }

Enter temp in range 0-99:60
hot

CCITcoder

Introduction to C

DataType and Operation

Conditional statements

Iterative statements

Functions

Array

Pointers

Structures

File I/O

Graphics

Additional Features