Memory related question in C

[TheDeveloper]

I want to write a c program to display list of data types and their corresponsing memory allocation size

There is any keyword in C which prints that "int" occupies "16" bits or such a kind of code is available ?

Please give me some suggestions.

Thanks
TheDeveloper

[NeonBlack]

the sizeof operator prints the number of bytes.

[TheDeveloper]

thanks for the quick answer

If there any way to find print minimum and maximum value accupied by different data types ?

say for example

"int" ranges between "-32,768 -> +32,767"

[tabstop]

Macros for the integer types are in limits.h. Macros for the floating-point types are in float.h.

[TheDeveloper]

Macros for the integer types are in limits.h. Macros for the floating-point types are in float.h.

can you please explain me with sample code to retrieve that data from limits.h ?

thanks in advance

[zacs7]

They're macros / constants -- see a list at http://www.cplusplus.com/reference/clibrary/climits/

As for using them, checkout the tutorial on this website http://www.cprogramming.com/tutorial/cpreprocessor.html

[P4R4N01D]

can you please explain me with sample code to retrieve that data from limits.h ?

As zacs7 noted, they are constants and by the time the program is executed, the pre-processor would have already replaced every instance of "INT_MAX" w/ 1240 (as an example).

[TheDeveloper]

They're macros / constants -- see a list at http://www.cplusplus.com/reference/clibrary/climits/

As for using them, checkout the tutorial on this website http://www.cprogramming.com/tutorial/cpreprocessor.html

Any luck that the values can be displayed using bitwise operator?

thanks in advance

[laserlight]

Any luck that the values can be displayed using bitwise operator?

No, since bitwise operators do not display anything. You can use bitwise operators with them, just as you can use bitwise operators with literals.

[itCbitC]

Any luck that the values can be displayed using bitwise operator?

thanks in advance

Perhaps something like

unsigned min, max;
min = 0;
max = ~min;

[TheDeveloper]

Perhaps something like

unsigned min, max;
min = 0;
max = ~min;

can someone explain what exactly this code does?

[laserlight]

can someone explain what exactly this code does?

For an unsigned integer, zero must be the minimum value, so it simply sets that as such. It then flips all the bits of zero to give the maximum unsigned value.

[tabstop]

can someone explain what exactly this code does?

Yes.

(If you're asking about bitwise operators, you should at least be able to recognize them when you see them -- ~ is bitwise not, which means max is assigned the bitwise complement of min (it has a 1 where min has a 0 and vice versa.)

[gooey_kablooie]

if u write max = ~min, max will be stored with the 1's complement of min....

As min is 0 max (in binary) will be 11111........1 31 times...

Hence max gives the max value an unsigned int can store...

[TheDeveloper]

For an unsigned integer, zero must be the minimum value, so it simply sets that as such. It then flips all the bits of zero to give the maximum unsigned value.

thanks for your answer

#include<stdio.h>
#include<conio.h>
void main()
{
 unsigned max,min;
 min = 0;
 clrscr();
 max = ~min;
 printf("%u",max);
 getch();
}
 
Output : 65535

How to find similar way for floating point values ?

thanks in advance