Question { TCS, 20305 }

what is the diff b/w MUTEX and semaphore?

Answer

Mutex is used for mutual exclusion, only one thread at a
time can use the resourse.
If Mutex is locked by one thread can not unlocked by
another thread.

Semaphore is used when we want one or more thread can use
the resouse at a time.
If Sem object is locked by one thread, it can be unlocked
in other thread.

Question { 5923 }

out put of printf(“%d”,printf(ram));

Answer

ram3
printf will print ram and printf function returns the
number of character it prints, so it will return 3, and
hence it will print ram3

Question { InterGraph, 43444 }

Program to find the sum of digits of a given number until
the sum becomes a single digit

Answer

int n = 123456789; //any numer of you want sum
int sum = 0;
while (n > 0)
{
int p = n % 10;
sum = sum + p;
n = n / 10;
if(n==0 && sum>9)
{
n=sum;
sum=0;
}
}
printf("%d",sum);

Question { Impiger, 5475 }

Write down the program to sort the array.

Answer

for(i=0;i {
for(j=0;j {
if(arr[j] >a[j+1])
{
temp=arr[j];
arr[j]=arr[j+1];
arr[j+1]=temp;
}
}
}

Is This Answer Correct ?

15 Yes

4 No

Question { IBM, 9281 }

why all c++ program must have default constructor?

Answer

To initialized objects of class, if you do not create your
own.Its a inbuilt feature of C++ compiler.