Question
#include<stdio.h>
typedef unsigned long int uli;
typedef uli u;
int main()
{
uli a;
u b = -1;
a = -1;
printf("%lu, %lu", a, b);
return 0;
}
What will be the output of the program?
#include<stdio.h>
typedef unsigned long int uli;
typedef uli u;
int main()
{
uli a;
u b = -1;
a = -1;
printf("%lu, %lu", a, b);
return 0;
}
Answer: Option C
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The system will treat the negative numbers with 2's complement method.
For 'long int' system will occupy 4 bytes (32 bits).
Therefore,
Binary 1 : 00000000 00000000 00000000 00000001
To represent -1, system uses the 2's complement value of 1. Add 1 to the 1's complement result to obtain 2's complement of 1.
So, First take 1's complement of binary 1 (change all 0s to 1s and all 1s to 0s)
1's complement of Binary 1:
11111111 11111111 11111111 11111110
2's complement of Binary 1: (Add 1 with the above result)
11111111 11111111 11111111 11111111
In HexaDecimal
11111111 11111111 11111111 11111111 = FFFF FFFF FFFF FFFF
In Unsigned Integer
11111111 11111111 11111111 11111111 = 4294967295.
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