Answer / ms

int ispow2(int number)
{
if(n<o) {
return 0;
}

else {

return !(number&(number-1));

}

Answer / sivaraj

Answer 2 Ms is correct and more efficient.

because if a number is power 2 it is in form

1000---->8
100----->4
10------>2 like form
subtract one from that and do with bitwise and it should be
zero.

ie 1000(8) & 0111(7)== 0

Answer / abhishek sharma

unsigned int is_power_of_2(unsigned int x)
{
return (x != 0) && ((x & (x - 1)) == 0);
}

Answer / sahil

int ispwrof2(int num)
{
int temp = 0;
if(num <= 0)
return 0;
else if(num > 0)
{
while(num%2 == 0)
{
temp = num/2;
num = temp;

}

}
if(num == 1)
return 1;
else
return 0;
}

Answer / hassan noureddine

To be a power of 2 number,is to have a single 1 bit, and the
rest bits are zeros, lik2 1, 2, 4 , 8, 16, 32, 64, 128, ...

the bitsize of the number is sizeof(number) * 8

isPowerOf2() returns 1 if successful, or 0 (false) otherwise
int isPowerOf2 (number)
{
int foundOnes = 0;
int bitsize = sizeof(number) * 8;

for (i = 0; i < bitsize; i++)
{
if (number & 1)
{
if(++foundOnes > 1)
return false;
/* shift the number to the right */
number >> 1;
}
}
return foundOnes;
}

Answer / santhi perumal

#include<stdio.h>
#include<conio.h>

int main()
{
int i,count = 0,number;

printf("Enter the number\n");
scanf("%d",&number);

for(i=15;i>=0;i--)
{
if((1<<i) & number)
count++;
}

if(count == 1)
printf("\nThe Given Number is Power of 2\n");
else
printf("\nThe Given Number is Not Power of 2\n");

}

Answer / swathi sharma

#include<stdio.h>
int main()
{
int num,i=1;
printf("Enter the number:");
scanf("%d", &num);
do
{
i=i*2;
if(i==num)
{
printf("\n The no.is power of 2.");
break;
}
else if(i>num)
{
printf("\n The no. is not power of 2");
break;
}
}
while(i != num);
return 0;
}

Answer / rajiv malhotra

/* THIS SOLUTION IS 100% CORRECT */

#include<stdio.h>
int isPowerOf2(float n)
{
while(n>1)
{
n/=2.0;
}
return (n==1)?1:0; /* 1-> TRUE; 0-> FALSE*/
}
void main()
{
int x,n;
printf("enter a number\n");
fflush(stdin);
scanf("%d",&n);
x=isPowerOf2(n);
if(x==1)
printf("\n yes");
else
printf("\n no");
}

Answer / sujan

int n = 3;
boolean bool = true;
int reminder;
while (n >1)
{
reminder = n % 2;
if(reminder != 0)
{
bool = false;
break;
}
else
{
n = n / 2;
}
}
if (bool == true)
printf("The number is a power of two");
else
printf("The number "+ m + " is NOT A power of two");

Answer / udhaya

Find if the given number is a power of 2.
//include math.h
void main()
{
int n,logval,powval;
printf("Enter a number to find whether it is s power of
2\n");
scanf("%d",&n);
logval=log(n)/log(2);
powval=pow(2,logval);
if(powval==n)
printf("The number is a power of 2");
else
printf("The number is not a power of 2");
getch();
}

WAP to accept basic salary of an employee? Calculate it HRA=25%,DA=30%,PF=30%&net salary display all contents?

6 Answers   Finite Infotech, Lovely Professional University, Wipro,

Is using exit() the same as using return?

0 Answers  

What should malloc(0) do? Return a null pointer or a pointer to 0 bytes?

0 Answers  

Write a Program to accept different goods with the number, price and date of purchase and display them

0 Answers   HDFC,

please give me answer with details #include<stdio.h> main() { int i=1; i=(++i)*(++i)*(++i); printf("%d",i); getch(); }

3 Answers  

What are function pointers? Provide an example.

1 Answers  

What is the difference between malloc() and realloc()?

2 Answers  

What are control structures? What are the different types?

0 Answers  

#define PRINT(int) printf("int = %d ",int) main() {< BR> intx,y,z; x=03;y=02;z=01; PRINT(x^x); z<<=3;PRINT(x); y>>=3;PRINT(y); }

0 Answers   Wilco,

What is difference between structure and union with example?

0 Answers  

pgm to find middle element of linklist(in efficent manner)

4 Answers   Huawei,

I need help with the following lab. Can anyone explain it to me on how to approach this problem. Coding would be great too !!! No busy waiting allowed. Remember that Java monitors are 'signal and continue'. The input data is called the database (DB). In this problem, it consists of a single variable initialized in the main thread, to contain the current time of day in HH:MM:SS:mmm format (mmm is milliseconds) truncated to 3 digits. Threads follow these rules: 1. Readers may all attempt to read at the same time, but NOT if a writer is writing (i.e.; the writer is in the monitor. 2. Writing is exclusive (only 1 writer at a time, no readers while writing). 3. Options: (to be specified by instructor) a. Readers have absolute priority over writers. b. Writers have absolute priority over readers c. When a reader arrives and a writer is waiting, the reader is suspended behind the writer instead of being admitted immediately. Thus, a writer waits for readers that were running when it arrived, but does not to wait for new readers. You may program this in C++ or Java. There are 4 controlling input values: 1. r – number of readers 2. w – number of writers 3. R – delay for a reader to restart 4. W – delay for a writer to restart Create the following program consisting of 1 main process (your main program) with n threads: 1. The main thread: a. Creates the 'n' threads needed. Of these, r of them are readers and w of them are writers. Starts all readers and writers. b. Waits for all 'n' threads to complete. You may use any method to detect when they are all complete. c. Prints out the resulting outputs from the threads. 2. Threads: a. When a thread starts to run, it immediately tries to enter the monitor. b. A reader thread reads the DB, outputs the exact message below, then exits: >>> DB value read =: HH:MM:SS:mmm by reader number: rr where the underlined text is replaced with actual data. c. A writer thread updates the DB with a new value (from the system time), outputs the exact message below, then exits: *** DB value set to: HH:MM:SS:mmm by writer number: ww where the underlined text is replaced with actual data. d. Each thread accesses the data a total of 10 times, exiting, then re-entering the monitor after each access. Hints: 1. File access *might* not be thread-safe, so you should be prepared to handle this. Read the documentation for the language you are using. 2. Suggested values for delays are: a. If looping, R >=1,000,000 and W>=100,000 b. If using “sleep”, then R=100 ms, W=50 ms. Additional: • Thread output is to ONE file used by ALL threads (so you need to synchronize access to it). • Readers must provide sufficient delay that results are useful (delay by R before re-trying). R is another input value. • Writers must also delay. Delay by W, updating the DB each time. W is an input. • Test your program with AT LEAST TWO different sets of values for r and w (#s of readers and writers) plus this set: r = 4, w=2. Basic operation of a thread: attempt to enter the monitor. If unsuccessful, you get put on a queue. When you get in, read or write the data (depending on type of thread), exit the monitor, wait the required delay amount, then try again. Repeat 10 times.

0 Answers