#include<stdio.h>
int
main()
{
int
a=10;
switch(a)
{
case
'1':
printf("ONE\n");
break;
case
'2':
printf("TWO\n");
break;
defa1ut:
printf("NONE\n");
}
return
0;
}
If you expect the output of the above program to be NONE, I would request you to check it out!!
The following C program segfaults of IA-64, but works fine on IA-32.
int
main()
{
int*
p;
p
= (int*)malloc(sizeof(int));
*p
=
10;
return
0;
}
Why does it happen so?
Here is a small piece of program(again just 14 lines of program) which counts the number of bits set in a number.
Input | Output |
0 | 0(0000000) |
5 | 2(0000101) |
7 | 3(0000111) |
int
CountBits (unsigned
int
x )
{
static
unsigned
int
mask[] = { 0x55555555,
0x33333333,
0x0F0F0F0F,
0x00FF00FF,
0x0000FFFF
} ;
int
i ;
int
shift ; /* Number of positions to shift to right*/
for ( i
=0, shift
=1; i
<
5; i
++, shift
*=
2)
x
= (x
&
mask[i ])+ ( ( x
>>
shift) &
mask[i]);
return
x;
}
Find out the logic used in the above program.
