C++ Roots, salary details, character pro

Program to enter an integer and output it in the reversed form

#include 

#include 

void main()

{

clrscr();

long int num1,num2,rnum=0;

cout << "Enter an integer : " << endl;

cin>>num1;

num2=num1;

do

{

rnum=rnum*10;

int digit=num1%10;

rnum+=digit;

num1/=10;

}

while(num1);

cout << "The integer you typed is " << num2 << "." << endl;

cout << "The reversed integer is " << rnum << "." << endl;

getch();

}

Output

The integer you typed is 987.

The reversed integer is 789.

Program to find the roots of a quadratic equation

#include 

#include 

#include 

int main()

{

clrscr();

float a,b,c,d,root1,root2;

cout << "Enter the 3 coefficients a, b, c : " << endl;

cin>>a>>b>>c;

if(!a)

{

if(!b)

cout << "Both a and b cannot be 0 in ax^2 + bx + c = 0" << "\n";

else

{

d=-c/b;

cout << "The solution of the linear equation is : " << d << endl;

}

}

else

{

d=b*b-4*a*c;

if(d>0)

root1=(-b+sqrt(d))/(2*a);

root2=(-b-sqrt(d))/(2*a);

cout << "The first root = " << root1 << endl;

cout << "The second root = " << root2 << endl;

}

getch();

return 0;

}

Output

The first root = 0.5

The second root = -1.5

Program to enter salary and output income tax and net salary

#include 

#include 

void main()

{

clrscr();

int itrate;

float salary,itax,nsalary=0;

cout << "Enter the salary : ";

cin>>salary;

if(salary>15000)

{

itax=salary*30/100;

itrate=30;

}

else if(salary>=7000)

{

itax=salary*20/100;

itrate=20;

}

else

{

itax=salary*10/100;

itrate=10;

}

nsalary=salary-itax;

cout << "Salary = $" << salary << endl;

cout << "Your income tax @ " << itrate << "% = $" << itax << endl;

cout << "Your net salary = $" << nsalary << endl;

getch();

}

Output

Salary = $12000

Your income tax @ 20% = $2400

Your net salary = $9600

Program to count the number of words and characters in a sentence

#include 

#include 

void main()

{

clrscr();

int countch=0;

int countwd=1;

cout << "Enter your sentence in lowercase: " << endl;

char ch='a';

while(ch!='\r')

{

ch=getche();

if(ch==' ')

countwd++;

else

countch++;

}

cout << "\n Words = " << countwd << endl;

cout << "Characters = " << countch-1 << endl;

getch();

}

Output

Words = 5

Characters = 18