1)#include <iostream.h>
int main()
{
int *a, *savea, i;
savea = a = (int *) malloc(4 * sizeof(int));
for (i=0; i<4; i++) *a++ = 10 * i;
for (i=0; i<4; i++) {
printf("%d\n", *savea);
savea += sizeof(int);
}
return 0;
}
2)#include <iostream.h>
int main()
{
int *a, *savea, i;
savea = a = (int *) malloc(4 * sizeof(int));
for (i=0; i<4; i++) *a++ = 10 * i;
for (i=0; i<4; i++) {
printf("%d\n", *savea);
savea ++;
}
return 0;
}
The output of this two programs will be different why?
Answers were Sorted based on User's Feedback
Answer / uma sankar pradhan
The output differs due to the followinf two statements
savea+=sizeof(int)
and
savea++
savea++
=>savea=savea+1
=>savea=savea+1*(sizeof(int))
savea+=sizeof(int)
=>savea=savea+2
=>savea=savea+2*sizeof(int)
sizeof(int) is called the scalefactor of savea
Is This Answer Correct ? | 5 Yes | 1 No |
Answer / d289
because when incremented by size of int(4), point to invalid
position in the int array. Hence it will print out only one
correct out put for the first element and garbage for the
rest in the first program while for the second program it
will print out the contents of the int array correctly.
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / ips
In 1st Case(savea++)
--------------------
The Integer Pointer Is Incremented just Once.(as it Is
Implimented in c/c++).which means the pointer is shifted
4bytes(size of type 'int') ahead.
In 2nd Case(savea+=sizeof(int))
-------------------------------
Here The Statement implies:-
savea+=4;
The above statement says that,the integer pointer is to
be increamented 4times.means,the Pointer now is shifted 16
bytes(4*sizeof type 'int').which is Out of scope of the
integer array in the Programme.
Is This Answer Correct ? | 3 Yes | 1 No |
Answer / shil chawla
the program will not RUN becoz #include<iostream.h>
does not support "printf()".
Is This Answer Correct ? | 1 Yes | 1 No |
Answer / mahesh
first program prints sum of saved and size of int
second one prints only the contenst of saved
Is This Answer Correct ? | 2 Yes | 3 No |
What is the stack?
Write a program which is required to process the time of a clock in hours and minutes, entered from the keyboard. With this program, there are two requirements for any data entered by a user: 1. The data must be of the correct type (in this case, two ints). 2. The data must be in the correct range: this means that, for the minutes, negative numbers and any number above 59 must be rejected; for the hours, negative numbers and any number above 23 must be rejected. Output error message for invalid data input. Output the time one and a half hour after the time input. i.e. Hour: 22 Min: 32 One and a half hour after 22:32 is 00:02
Explain virtual destructor?
Write about the role of c++ in the tradeoff of safety vs. Usability?
Is C++ case sensitive a) False b) Depends on implementation c) True
Do we have to use initialization list in spite of the assignment in constructors?
Explain bubble sorting.
How do you declare a set in c++?
Can we sort map in c++?
How do you print for example the integers 3,2,1,5,4 in a binary tree within the console in format where it looks like an actual binary tree?
Explain stack & heap objects?
Write about the stack unwinding?