I have created a code that receives input from the serial monitor then prints it again but it prints the numbers one by one
10 - 48 = -38.
Change the serial monitor line ending to 'no line ending'.
But then you need to decide where your number ends ...
Maybe leave it at line-feed, and use that to tell your sketch you have finished typing in your number.
And you forgot the "multiply by ten" as new digits come in.
And I would suggest not to use images of code and serial monitor 
Hopefully OP will not post 20 plus screenshots when his code grows to a few 100 lines 
@crazyboy39821, please spend some time reading How to get the best out of this forum
Your program does exactly what you wrote in the code.
Reads one byte, calculates a digit, prints "I received : ", prints one digit.
The last number is the Newline character ('\r' '\n' = 10), which your serial monitor adds.
10 - 48 = -38
Everything is correct.
What did you want to get?
sp. '\n' == 10 == line-feed
'\r' == 13 == carriage return
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See my tutorial on Arduino Software Solutions for various ways to read from Serial with their pros and cons.
Serial.read() returns one character. If you want to read a multi-digit number, use Serial.parseInt().
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