Are signed int and signed will do the same work?

#1

Also can we write
unsigned int b=-9;

//The above statement is not valid naa
as unsigned is used for positive intergers.

This statement was used in ques 5 in quiz 1 on programming fundamentals…

#2

yes this statement is logically not valid
it will not give error
but give unexpected output

#3

question of quiz is not visible to me
can you send the question also
so that i can explain this in context of quiz

#4

I have send u the question of quiz in chat section .
This question uses unsigned for negative integers???

#5

This was the question!

"/* Output ? */
#include<iostream>
using namespace std;

int main(){
    long signed CodingBlocks = 2017;
    short unsigned BOSS1     = -2018;
    unsigned BOSS2           = -2019;
    int      BOSS3           = -2020;
    long long unsigned BOSS4 = -2021;
    short unsigned Nagarro   = 2018.9;
    long signed HackerBlocks = 'A';
    cout<<CodingBlocks<<endl;
    cout<<BOSS1<<endl<<BOSS2<<endl<<BOSS3<<endl<<BOSS4<<endl;
    cout<<Nagarro<<endl;
    cout<<HackerBlocks<<endl;


    return 0;
    }"

2017 2^16 - 2018 2^32 -2019 -2020 2^64 - 2021 2018 65

2017 2018 2019 2020 2021 2018.9 A

2017 2^32 - 2018 2^32 -2019 -2020 2^32 - 2021 2018 65

2017 2^32 - 2018 2^32 -2019 -2020 2^64 - 2021 2018 64

#6

Ans=
2017 2^16 - 2018 2^32 -2019 -2020 2^64 - 2021 2018 65
CodingBlocks is int so int can store 2017

BOSS1 is an unsigned short since unsigned only stores only positive number , so negative numbers are stored as 2^16 - x (where x is negative) (2^16 because short int contain 16 bits)
so -2018 will be stored as 2^16-2018

BOSS2 is an unsigned int and since int has 32bits so the -2020 will be stored as 2^32

BOSS3 is an int so can store -2020

BOSS4 is an unsigned long long int and since long long int has 64 bits so -2021 will be stored as 2^64-2021

Nagarro is an int so 2018.9 will be stored as 2018 (only the integer part)

HackerBlocks is a signed int so ‘A’ will be stored as its ascii value i.e. 65 due to typecasting s

In case of any doubt feel free to ask :slight_smile:
Mark your doubt as RESOLVED if you got the answer