RENEW 1 :

RENEW is like an exensin to basic which gives a whole lot of practice in aready discussed basic posts..this gives a immense practice and workout schedule to 'RENEW' ones capablity in programming with 'c'

1./* wap which accepts the dimensions of a rectangle and displays its perimeter*/

main()

{

float l,b,p;

printf("give the dimensions");

scanf("%f %f",&l,&b);

p = 2*(l+b);

printf("the perimeter is %d",p);

}

dry run :

• we declared 3 variables l,b,p corresponding to length, breadth and perimeter of the rectangle.
• we requested user to provide the values of l,b
  
• we saved respective values in thier variables l,b;
• appliying formula perimeter = 2*(length+breadth)
• printing final value of p

out put:

give the dimensions 5 5

the perimeter is 20

2. /* wap which accepts basic salary of a person , also his expenditure on rent(in percent of his salary),food(in percent of his salary) and other amenities(in percent of his salary) and dedects his gross savings*/

main()

{

float salrary,rent,food,other,saving;

printf("give salary,rent,food,other");

scanf("%f %f %f %f",&salary,&rent,&food,&other);

saving = salary - ((food+rent+other)/100)*salary);

printf("%d is savings",saving);

}

dry run:

• create all convienient variables
• take salary,rent,food,and other expenditure in to the respective variables
• calculate savings by the above formula
• print the savings

out put

give salary food rent and other - 10000 25 25 10 

4000 is the savings

3./*wap which accepts coefficients of a quadratic equation and prints its roots*/

#include(math.h)

main()

{

int a,b,c;

float r1,r2;

printf("give the coefficients");

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

r1= -b+sqrt(b*b-4*a*c)/(2*a);

r2= -b-sqrt(b*b-4*a*c)/(2*a);

printf("%f %f",r1,r2);

}

dry run:

• take integer variables for coefficients be cause they are generally not flaot type
• take float type for roots as they are generally of float type
• request values from user
• read the values into respective variables
• operate with the formulas and obtain the roots
• print the roots

4./*wap which accepts coordinates of a point and determines its distance from the origin*/

#include(math.h)

main()

{

float x,y,d;

printf("give coordinates");

scanf("%f %f",&x,&y);

d= sqrt(x*x+y*y);

printf("%f",d);

}

5./*wap to find modulous of a given number*/

#include

main()

{

int x,a;

printf("give n");

scanf("%d",&n);

a=(x>0)?x:-x;

printf("|x| = %d",a);

}

output:

give n -6

|-6| = 6

dryrun:

• take a variable and request a value
• take the value into the variable
• assume a variable that stores a value which is dependent on the condition x>0
• if condition is true it stores x in it else -x here we use conditional operator.
• print the resultant variable to get desired result

6./*wap to double a nuimber with out using any arthematic operators*/

main()

{

int a,b;

printf("give a");

scanf("%d",&a);

b=a<<1;>

printf("%d",b);

}

out put:

give n 6

12

dry run

• the above prog is just an example for leftshift
• we take a variable,reqest for a value...and read tht value into the variable..
• then we operate a with leftshift one time .....and name the resultant as b
• the bits written leniarly ....are shifted one pos to left and resultant is the double of the initial 
• we at last print the resultant
• this program is just an example for left shift it does not work with all numbers

7./*wap to demonstate increment and decrement operators*/

main()

{

int a,b,c,d,e,f,g;

printf("give a value of a");

scanf("%d",&a);

b =a++;

c=++a;

d=a++ + ++a

e=++a + a++

f =a++*++a

g=++a*a++

printf("%d %d %d %d %d %d %d ",a,b,c,d,e,f,g);

}

dry run + out put:

• request the user and read in value of a
• as per operation of an incerment operator b is a++ ,ie if a is five thaen b will become 5
• at the end of the above step a will become 6 so as c=++a , first increment is done and then assignment which follows hence, c will become 6+1=7
• at the end of the above step a is 7 so as d=a++ + ++a; first increment is done so a=7+1=++a,which is added to a,ie d =8+8=16;and at the end a=8+1=9
• similarly by folloyin all the operation of increment and decrement operaors, we get all the above results

sources:

• "let us c" by Yashwant Kanethkar
• "C programming" and data structures by Balaguruswamy