C Have Switch Continue Cases Until

Switch case statement in C language

switch case

               This case statement is a multi-way decision statement which is a simpler version of the if-else block which evaluates only one variable. The switch statement is used to pick up or execute a particular group of statements from several available group of statements. It allows us to make a decision from the number of choices. It is a multiway decision statement. It tests the value of given variable or expression against a list of case values and when a match is found, a block of statements associated with that case is executed. The expression follows the keyword switch.

Rules for writing switch() statements:

• The expression in switch statements must be an integer value or a character constant.
• No real numbers are used in an expression.
• Each case block and default blocks must be terminated with break statement.
• The default is optional and can be placed anywhere, but usually placed at end.
• The case keyword must terminate with colon (:).
• No two case constants are identical.
• The case labels must be constants.
• The switch can be nested.
• The value of switch expression is compared with the case constant expression in the order specified. i.e. from top to bottom.
• In the absence of break statement, all statements that are followed by matched cases are executed.

Syntax:

   Switch(expression)
     {
        Case 1:
                Statements_Block 1;
               Break;
        .             .
        .             .
        .             .
     Case n:
                  Statementd_Block n;
                  Break;
     Default:
                 Default block;
     }

Flow Chart:

Example-1: Write a C program to illustrate switch without break

            #include<stdio.h>  void main() { int i; printf(" Enter choice [1 or 2]\n"); scanf("%d",&i); switch(i)    {      case 1: printf("\n This is case 1\n");      case 2: printf("\n This is case 2\n");      default: printf("\n This is default case\n");    }  getch(); }          

Output:

Case-1

Case-2

Case-3

             When we want to execute only one choice we must use break statement.

Break:

                The break statement causes the program to jump out of the switch statement. Break is used to suspend sequential execution. If we add a break as the last statement in each case now only print statement will be executed.

Example-2: Write a C program to illustrate switch with break.

            #include<stdio.h>  void main() {     int i;      printf(" Enter choice\n");     scanf("%d",&i);      switch(i)      {          case 1: printf("\n This is case 1 \n");           break;          case 2: printf("\n This is case 2 \n");           break;          default: printf("\n This is default case \n");      } getch(); }          

Output:

Case-1

Case-2

Case-3

Example-3: Write a C program to perform arithmetic operations based on user choice.

            #include<stdio.h>  void main() {   int a,b,ch;      printf("\n 1. addition\n 2. subtraction\n 3. multiplication\n 4. division\n 5. modulo division\n");        printf("\n Enter your choice. \n");      scanf("%d",&ch);       switch (ch)      {        case 1:               printf("\n Enter two values to add \n");               scanf("%d%d",&a,&b);               printf(" %d+%d = %d \n",a,b,a+b);               break;        case 2:                printf("\n Enter two values to subtrct \n");                 scanf("%d%d",&a,&b);                printf("\n %d-%d = %d \n",a,b,a-b);                break;        case 3:                printf("\n Enter two values to multiply \n");                 scanf("%d%d",&a,&b);                printf("\n %d*%d = %d \n",a,b,a*b);                break;        case 4:                printf("\n Enter two values to divide \n");                 scanf("%d%d",&a,&b);                printf("\n %d/%d = %d \n",a,b,a/b);                break;        case 5:                printf("\n Enter two values to modulo division \n");                 scanf("%d%d",&a,&b);                printf("\n %d%%%d = %d \n",a,b,a%b);                break;        default: printf("\n Invalid choice, Please enter valid choice. \n");      }  getch(); }          

Output:

Case-1

Case-2

Case-3

Case-4

Case-5

Case-6

Example-4: Write a program to check if the character entered is a vowel or not.

            #include <stdio.h>  void main() {   char ch;     printf(" Enter any character:\n");      scanf("%c", &ch);    switch(ch)      {        case 'A':        case 'a':        case 'E':        case 'e':        case 'I':        case 'i':        case 'O':        case 'o':        case 'U':        case 'u':          printf("\n %c is a vowel \n",ch);            break;        default:      printf("\n %c is not a vowel \n",ch);     } }          

Output:

Case-1

Case-2

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Source: https://ssonlinecoding.com/c-language/c-switchcasebreak/