#ifdef & #endif
Posted on December 7, 2009
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
#ifdef something
int some=0;
#endif
main()
{
int thing = 0;
printf("%d %d\n”, some ,thing);
}
Answer:
Compiler error : undefined symbol some
Explanation:
This is a very simple example for conditional compilation. The
name something is not already known to the compiler making the
declaration
int some = 0;
effectively removed from the source code.
#if something == 0
int some=0;
#endif
main()
{
int thing = 0;
[Read More]sizeof operator
Posted on December 7, 2009
(Last modified on August 7, 2020)
| 2 minutes
| Kinshuk Chandra
**1)** Why is sizeof operator and not function
sizeof() is a compile time operator. To calculate the size of an object, we need the type information. This type information is available only at compile time. At the end of the compilation phase, the resulting object code doesn’t have (or not required to have) the type information. Of course, type information can be stored to access it at run-time, but this results in bigger object code and less performance.
[Read More]Using pascal keyword
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
1)
main()
{
int i=10;
void pascal f(int,int,int);
f(i++,i++,i++);
printf(” %d”,i);
}
void pascal f(integer :i,integer:j,integer :k)
{
write(i,j,k);
}
Answer:
Compiler error: unknown type integer
Compiler error: undeclared function write
Explanation:
**Pascal keyword doesn’t mean that pascal code can be used. It means that
the function follows Pascal argument passing mechanism in calling the functions.
**
2)
**
void pascal f(int i,int j,int k)
{
printf(“%d %d %d”,i, j, k);
[Read More]Ratio and proportion difficult questions
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 3 minutes
| Kinshuk Chandra
1.Three containers A,B and C are having mixtures of milk and water in the ratio of 1:5 and 3:5 and 5:7 respectively. If the capacities of the containers are in the ratio of all the three containers are in the ratio 5:4:5, find the ratio of milk to water, if the mixtures of all the three containers are mixed together.
Sol: Assume that there are 500,400 and 500 liters respectively in the 3 containers.
[Read More]Ratio and proportion difficult questions
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 3 minutes
| Kinshuk Chandra
1.Three containers A,B and C are having mixtures of milk and water in the ratio of 1:5 and 3:5 and 5:7 respectively. If the capacities of the containers are in the ratio of all the three containers are in the ratio 5:4:5, find the ratio of milk to water, if the mixtures of all the three containers are mixed together.
Sol: Assume that there are 500,400 and 500 liters respectively in the 3 containers.
[Read More]Problems on partnership
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 3 minutes
| Kinshuk Chandra
1.When investments of A and B are Rs x and Rs y for a year in a
business ,then at the end of the year
(A’s share of profit):(B’s share of profit)=x:y
2.When A invests Rs x for p months and B invests Rs y for q months,
then A’s share profit:B’s share of profit=xp:yq
Short cuts:
1.In case of 3 A,B,C investments then individual share is to be found
[Read More]Time and Distance questions
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 7 minutes
| Kinshuk Chandra
Problems
1)A person covers a certain distance at 7kmph .How many meters
does he cover in 2 minutes.
Solution::
speed=72kmph=72*5/18 = 20m/s
distance covered in 2min =20*2*60 = 2400m
2)If a man runs at 3m/s. How many km does he run in 1hr 40min
Solution::
speed of the man = 3*18/5 kmph
= 54/5kmph
Distance covered in 5/3 hrs=54/5*5/3 = 18km
3)Walking at the rate of 4knph a man covers certain distance
[Read More]Trains
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 1 minutes
| Kinshuk Chandra
(1) Time taken by a train x mt long in passing a signal post
or a pole or a standing man = time taken by the train to cover x mt
(2) Time taken by a train x mt long in passing a stationary
object of length y mt = time taken by the train to cover x+y mt
(3) Suppose two trains or two bodies are moving in the same
[Read More]Multiplication Tables
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 5 minutes
| Kinshuk Chandra
1 × 1 = 1 2 × 1 = 2 2 × 2 = 4 3 × 1 = 3 3 × 2 = 6 3 × 3 = 9 4 × 1 = 4
4 × 2 = 8
4 × 3 = 12 4 × 4 = 16 5 × 1 = 5
5 × 2 = 10 5 × 3 = 15 5 × 4 = 20 5 × 5 = 25 6 × 1 = 6
[Read More]Find all sets of consecutive integers that add up to 1000.
Posted on December 6, 2009
(Last modified on August 7, 2020)
| 2 minutes
| Kinshuk Chandra
There are total 8 such series:
1.
Sum of 2000 numbers starting from -999 i.e. summation of numbers from -999 to 1000. (-999) + (-998) + (-997) + ….. + (-1) + 0 + 1 + 2 + ….. + 997 + 998 + 999 + 1000 = 1000
2.
Sum of 400 numbers starting from -197 i.e. summation of numbers from -197 to 202. (-197) + (-196) + (-195) + ….
[Read More]