What will happen if break statement is not used in switch case in C?

Switch case statements are used to execute only specific case statements based on the switch expression. If switch expression does not match with any case, default statements are executed by the program.

Example

int x = 3;

switch (x) {
    case 1:
        printf("x is 1");
        break;
    case 2:
        printf("x is 2");
        break;
    default:
        printf("x is not 1 or 2");
        break;
}

In this example, if x=3 which is not handled by any of the case statement, the default statement will be executed.

goto statement is used to transfer the normal flow of a program to the specified label in the program. Below is the syntax for goto statement in C.

{
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                  <h5 class="mb-1" style="color:#194757;">650. &nbsp;What value will be assigned to the variable X if a = 10, b = 20, c = 30, d = 40 for the expression X = a/b+c*d-c?</h5>
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                     Answer: <ul>
<li>The above arithmetic operation is performed based on the precedence of the operators.</li>
<li>In above mentioned expression, c*d will be performed first. Then, a/b, then (c*d)-c, then (a/b) + ((c*d)-c).</li>
<li>Please check the operator precedence table to know the priority and associativity of the C operators.</li>
<li>Output of the above expression is 1170.</li>
</ul>
<pre class="prettyprint">
<xmp>

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#include <stdio.h>
#include <stdlib.h>
 
int main()
{
   int a = 10, b = 20, c = 30, d = 40, X ;
 
   X = a/b+c*d-c;
   printf(" Value of X = %d\n", X);
   return 0;
}

int X1 = 13/3;
int X2 = 13%3;

• The value of X1 is 4
• The value of X2 is 1

Storage class of all variables are auto by default unless we specify a variable is register or static or extern in C program.

• Both auto variable and register variable are local variables. Register variables are stored in register memory. Whereas, auto variables are stored in main CPU memory.
• Register variables will be accessed very faster than the normal/auto variables since they are stored in register memory rather than main memory.
• But, only limited variables can be used as register since register size is very low. (16 bits, 32 bits or 64 bits)

• Both auto and static variables are local variables.
• Static variables can retain the value of the variable between different function calls.
• But, scope of auto variable is within the function only. It can’t retain the value of the variable between different function calls.

• Type cast function should not be used in const and volatile declaration.
• Because, constant value can’t be modified by the program once they are defined.
• And, volatile variable values might keep on changing without any explicit assignment by the program as operating system will be modifying these values.

• Any number of arguments can be passed to a function. There is no limit on this. Function arguments are stored in stack memory rather than heap memory. Stack memory allocation is depending on the operating system.
• So, any number of arguments can be passed to a function as much as stack has enough memory. Program may crash when stack overflows.

All functions are global by default in a C program/file. But, static keyword makes a function as a local function which can be accessed only by the program/file where it is declared and defined. Other programs/files can’t access these static functions.

• atexit() function can be used if we want to execute any function after program is terminated normally.
• Syntax: int atexit (void (*func)(void));
• The function “func” will be called automatically without any arguments once program is terminated normally.