Let us C book Chapter 1 Exercise Solutions

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 [A] Which of the following are invalid C constants and why?

‘3.15’ : Valid C Constant falls into Real Constant category

35,550 : Invalid C Constant because comma is not allowed 

3.25e2 : Valid Exponential format of Real Constant 

2e-3 : Valid Exponential form of Real Constant 

‘eLearning’ : Invalid C Constant Because Only ONe character should be there and single quote present 

“Show” : Valid C Constant 

‘Quest’ : Invalid C Constant because single quote present instead of double 

2^3 : Invalid C Constant 

4 6 5 2 : Invalid C Constant because spaces not allowed 


[B] Which of the following are invalid variable names and why?

B’day : Invalid Variable Name because single quote present 

Int : Invalid Variable name because it is a reserved Keyword 

$hello : Invalid C Variable Name 

#Hash : Invalid because only alphabets, digits and underscores allowed in naming variable 

Dot.  : Invalid 

Number : Valid 

totalArea : Valid 

_main() : Invalid, variable name cannot have () 

Temp_in_deg : Valid 

total% : Invalid 

1st : Valid 

Stack-queue : Invalid 

Variable name : Invalid you cannot have space 

%name% : INvalid because you cant have %

Salary : Valid 


True or False 

(a) C language has been developed by Dennis Ritchie. : TRue

(b) Operating systems like Windows, UNIX, Linux and Android are

written in C.

True 

(c) C language programs can easily interact with hardware of a PC /

Laptop

True 

(d) A real constant in C can be expressed in both Fractional and

Exponential forms

True 

(e) A character variable can at a time store only one character. : True

(f)

The maximum value that an integer constant can have varies from

one compiler to another.

True

(g) Usually all C statements are written in small case letters.

True 

(h) Spaces may be inserted between two words in a C statement. True 

Spaces cannot be present within a variable name. True 

C programs are converted into machine language with the help of a

program called Editor.

 False its compiler 

(k) Most development environments provide an Editor to type a  

program and a Compiler to convert it into machine language.

True 

(l)

int, char, float, real, integer, character, char, main, printf and scanf

all are keywords.

False because integer, character , main , printf, scanf are not keywords 


MAtch the following 

A \n : Escape Sequence 

B 3.1345 -> Real Constant 

C -65313 -> Integer Constant 

D ‘D’ -> Character COnstant 

E 4.25e-3 -> Exponential form 

F main() -> function 

G %f, %d, %c -> Format Specifier 

H ; -> Statement Terminator 

I Constant -> Literal 

J Variable -> Identifiers 

K & -> Address of operator 

L printf() -> Output Function 

M scanf() -> Input Function 



[E] Point out the errors, if any, in the following programs:

(a) int main( )

{

int a, float b, int c ;

a = 25 ; b = 3.24 ; c = a + b * b – 35 ;

}


Int a, float b, int c -> Wrong writing

Correct syntax -> int a,c; float b;

c = a + b * b – 35 ; -> - absent


(b) /* Calculation of average

/* Author: Sanjay */

/* Place – Whispering Bytes */

*/

#include <stdio.h>

int main( )

{

int a = 35 ; float b = 3.24 ;

printf ( "%d %f %d", a, b + 1.5, 235 ) ;

}


Comments are incorrectly used 

/* /* */  -> Right use /*  */


(c) #include <stdio.h>

int main( )

{

int a, b, c ;

scanf ( "%d %d %d", a, b, c ) ;

}

Perfect 


(d) #include <stdio.h>

int main( )

{

int m1, m2, m3

printf ( "Enter values of marks in 3 subjects" )

scanf ( "%d %d %d", &m1, &m2, &m3 )

printf ( "You entered %d %d %d", m1, m2, m3 ) ;

}

Semicolon not used 
I believe in Knowledge because it is the only thing in this world that is never going to vanish and stay updated at all times. The internet has enabled us to acquire Knowledge and use it in our daily life and prosper ourselves. I like to Read Books, Write Blogs, Research a lot. Books offer us a great source of detailed content of almost anything. I m looking forward to work with companies to enhance my skills and benefit your company in many ways. I am a Tech geek, automated lots of daily tasks on android, Experienced in Windows and Linux Operating System, Excellent grasp in Computer Networking

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