Let Us C: Chapter 1 Solution

Let Us C by YASHAVANT P. KANETKARChapter 1: Getting Started (PAGE:39)

Exercise

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

BASICSALARY
1)_basic      
OK          

2)basic-hra

WRONG

No special symbol other than undersccore can be used in a variable name.                

3)#MEAN

WRONG

No special symbol other than undersccore can be used in a variable name.

4)group.

WRONG

No special symbol other than undersccore can be used in a variable name.

5)422

WRONG

The first character in the variable name must be an alphabet or imderscore(_)

6)population in 2006

WRONG

No commas or blanks are allowed within a variable name.

7)over time

WRONG

No commas or blanks are allowed within a variable name.

8)mindovermatter

Correct

9)FLOAT

WRONG

Keywords can not be used as variable names if we do so, we are trying to assign a new meaning to rhe keywoed which is not allowed by the computer.

10)hELLO

OK

11)queue.

WRONG

No special symbol other than undersccore can be used in a variable name.

12)team'svictory

WRONG

No special symbol other than undersccore can be used in a variable name.

13)Plot # 3

WRONG

No special symbol other than undersccore can be used in a variable name.

14)2015_DDay

WRONG

The first character in the variable name must be an alphabet or imderscore(_)

[B] Point out the errors, if any in the following C statements:

(a) int  = 314.562 * 150

Correction = float = 314.562*150

(b) name = 'ajay';

OK

(c) varchar = '3';
OK

(d) 3.14*r*h = vol_of_cyl;
Correction =  vol_of_cyl = 3.14*r*h;

(e) k = (a*b)(c+(2.5a+b)(d+e)

(f)m_inst = rate of interest*amount in rs;
Correction = m_inst = rate_of_interest*amount_in_rs;

(g) si = principal*rateofinterest*numberofyears/100;
OK

(h)area = 3.14*r**2;

Correction => area = 3.14*r*r;

(i) volume => 3.147*r*r*h;

(j) k =  ((a*b)+c)(2.5*a+b)
Correction =>  k = ((a*b)+c)*(2.5a+b)

(k) a = b  = 3 = 4
Correction => a = b = 3

(l) count = count +1;

OK

m) date = '2Mar 03;

OK