C Programming - Control Instructions - Discussion

@jump Table

A jump table is an abstract structure used to transfer control to another location.

#include<stdio.h>

int main(int argc, char **argv)
{
int i;
scanf("%d",&i);
switch(i)
{
case 1:
printf("\nIts %d",i);
break;
case 2:
printf("\nIts %d",i);
break;
case 3:
printf("\nIts %d",i);
break;
case 4:
printf("\nIts %d",i);
break;
case 5:
printf("\nIts %d",i);
break;
default: printf("\nIts not in range of 1-5");

}
}

In this program if 3 is true, then it will directly jump to body of case 3, & it will keep executing all statements until it want gets a break statement.

We can use it but it is not efficient and hence not preferred. Instead we can use an if statement to check for a range of values.

Eg. to check whether value of variable x lies between 0 and 100.

1.switch-case

switch(x)
{
case 0:
case 1:
case 2:
.
.
.
.
case 99:
case 100:printf("True");break;
default: printf("False");break;
}

//This is very long and tedious and hence not useful. Instead we can Accomplish this in a few lines only using if statement.

2.if-else

if(x>=0 && x<=100)
printf("True");
else printf("False");

Hello
If v don't knw the ans...
by reading 4th option v say its 100% rit.
then check out of A B C D wch hav 4, so v got only B & C hav 4
so discard A&D now B hav 1 3 & C hav 2 Extra
Then read only 2nd option
if 2 is right then surely ans is C else
ans is 100% B.
Such typ Of technique is used for Finding the exactly correct ans in very short time.
thnx hav a nic day

We can check if a particular number falls in a range using switch. That's why according to me option 2 should be correct.

For example if x=5 & we hav to check if x falls in 2 to 7

switch(x)
{ case 2:
case 3:
case 4:
case 5:
case 6:
case 7:printf("in range");
break;
default:printf("not in range");
}

Why statement 2 is wrong?

We can check for ranges.

/*example*/
switch(a)
{
case 2:
case 3:
case 4:
/* some statements */
break;
case 5:
case 6:
case 7:
/* some statements */
break;
}

In some particular situations in switch statement we can control the execution by using break; and then it terminates the execution of the program in number of cases of the switch.

Break statement is not neccesary in every case of the switch statement. In some programs we can implement switch cases without using break;.

We can't check the ranges of non-integer values through switch statement, and so switch is not useful in checking the ranges of a number.

We can't check the ranges of non-integer values through switch statement, and so switch is not useful in checking the ranges of a number.

Yes, we can use switch for checking whether the given value falls under a range or not. So how can it be incorrect?