The Incredible
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mohit sharma said:well ' LET US C++ ' by yaswant kanitkar
Let me know abt da publisher.
Anindya
mohit sharma said:well ' LET US C++ ' by yaswant kanitkar
Quadratic eqn program#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
float p,r,n,ci,amount;
cout<<"\nEnter principal:";
cin>>p;
cout<<"\nEnter rate:";
cin>>r;
cout<<"\nEnter time:";
cin>>n;
amount=p*pow((1+(r/100)),n);
ci=amount-p;
cout<<"\nThe compound interest is: "<<ci;
getch();
}
#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
float a,b,c,d,sqrtd,r1,r2;
cout<<"\nEnter values of a,b,and c for equation ax^2+bx+c:";
cin>>a>>b>>c;
d=(b*b)-(4*a*c);
sqrtd=sqrt(d);
r1=(-b+sqrtd)/(2*a);
r2=(-b-sqrtd)/(2*a);
cout<<"\nThe roots are: "<<r1<<","<<r2;
getch();
}
*www.cprogramming.com/tutorial.html
Lesson 1
#include <iostream>
using namespace std;
int main()
{
cout<<"HEY, you, I'm alive! Oh, and Hello World!\n";
cin.get();
}
#include <iostream>
using namespace std;
int main()
{
cout<<"HEY, you, I'm alive! Oh, and Hello World!\n";
cin.get();
return 1;
}
Here are some variable declaration examples:
int x;
int a, b, c, d;
char letter;
float the_float;
Here is a sample program demonstrating the use a a variable:
#include <iostream>
using namespace std;
int main()
{
int thisisanumber;
cout<<"Please enter a number: ";
cin>> thisisanumber;
cin.ignore();
cout<<"You entered: "<< thisisanumber <<"\n";
cin.get();
}
Here are a few examples:
a = 4 * 6; // (Note use of comments and of semicolon) a is 24
a = a + 5; // a equals the original value of a with five added to it
a == 5 // Does NOT assign five to a. Rather, it checks to see if a equals 5
For example:
a < 5 // Checks to see if a is less than five
a > 5 // Checks to see if a is greater than five
a == 5 // Checks to see if a equals five, for good measure
Lesson 2: If statements
Here are the relational operators, as they are known, along with examples:
> greater than 5 > 4 is TRUE
< less than 4 < 5 is TRUE
>= greater than or equal 4 >= 4 is TRUE
<= less than or equal 3 <= 4 is TRUE
== equal to 5 == 5 is TRUE
!= not equal to 5 != 4 is TRUE
The structure of an if statement is as follows:
if ( TRUE )
Execute the next statement
For example:
if ( TRUE ) {
Execute all statements inside the braces
}
if ( TRUE ) {
// Execute these statements if TRUE
}
else {
// Execute these statements if FALSE
}
#include <iostream>
using namespace std;
int main() // Most important part of the program!
{
int age; // Need a variable...
cout<<"Please input your age: "; // Asks for age
cin>> age; // The input is put in age
cin.ignore(); // Throw away enter
if ( age < 100 ) { // If the age is less than 100
cout<<"You are pretty young!\n"; // Just to show you it works...
}
else if ( age == 100 ) { // I use else just to show an example
cout<<"You are old\n"; // Just to show you it works...
}
else {
cout<<"You are really old\n"; // Executed if no other statement is
}
cin.get();
}
A. !( 1 || 0 ) ANSWER: 0
B. !( 1 || 1 && 0 ) ANSWER: 0 (AND is evaluated before OR)
C. !( ( 1 || 0 ) && 0 ) ANSWER: 1 (Parenthesis are useful)
Lesson 3: Loops
for ( variable initialization; condition; variable update ) {
Code to execute while the condition is true
}
Example:
#include <iostream>
using namespace std; // So the program can see cout and endl
int main()
{
// The loop goes while x < 10, and x increases by one every loop
for ( int x = 0; x < 10; x++ ) {
// Keep in mind that the loop condition checks
// the conditional statement before it loops again.
// consequently, when x equals 10 the loop breaks.
// x is updated before the condition is checked.
cout<< x <<endl;
}
cin.get();
}
while ( condition ) { Code to execute while the condition is true }
Example:
#include <iostream>
using namespace std; // So we can see cout and endl
int main()
{
int x = 0; // Don't forget to declare variables
while ( x < 10 ) { // While x is less than 10
cout<< x <<endl;
x++; // Update x so the condition can be met eventually
}
cin.get();
}
do {
} while ( condition );
Example:
#include <iostream>
using namespace std;
int main()
{
int x;
x = 0;
do {
// "Hello, world!" is printed at least one time
// even though the condition is false
cout<<"Hello, world!\n";
} while ( x != 0 );
cin.get();
}
Lesson 4: Functions
For example:
#include <cstdlib> // Include rand()
using namespace std; // Make rand() visible
int a = rand(); // rand is a standard function that all compilers have
The general format for a prototype is simple:
return-type function_name ( arg_type arg1, ..., arg_type argN );
int mult ( int x, int y );
Lets look at an example program:
#include <iostream>
using namespace std;
int mult ( int x, int y );
int main()
{
int x;
int y;
cout<<"Please input two numbers to be multiplied: ";
cin>> x >> y;
cin.ignore();
cout<<"The product of your two numbers is "<< mult ( x, y ) <<"\n";
cin.get();
}
int mult ( int x, int y )
{
return x * y;
}
cout<<"The product of your two numbers is "<< x * y <<"\n";
Lesson 5: switch case
switch ( <variable> ) {
case this-value:
Code to execute if <variable> == this-value
break;
case that-value:
Code to execute if <variable> == that-value
break;
...
default:
Code to execute if <variable> does not equal the value following any of the cases
break;
}
int a = 10;
int b = 10;
int c = 20;
switch ( a ) {
case b:
// Code
break;
case c:
// Code
break;
default:
// Code
break;
}
#include <iostream>
using namespace std;
void playgame();
void loadgame();
void playmultiplayer();
int main()
{
int input;
cout<<"1. Play game\n";
cout<<"2. Load game\n";
cout<<"3. Play multiplayer\n";
cout<<"4. Exit\n";
cout<<"Selection: ";
cin>> input;
switch ( input ) {
case 1: // Note the colon, not a semicolon
playgame();
break;
case 2: // Note the colon, not a semicolon
loadgame();
break;
case 3: // Note the colon, not a semicolon
playmultiplayer();
break;
case 4: // Note the colon, not a semicolon
cout<<"Thank you for playing!\n";
break;
default: // Note the colon, not a semicolon
cout<<"Error, bad input, quitting\n";
break;
}
cin.get();
}
ashu888ashu888 said:Hey Mach bro ! Mr.Incredible already said tat he didnt get any help from the site that u mentioned..
The Incredible said:C'mon Guys!
i'm not having time to read da buks n uderstand da logics.
i've already mentioned that my compu exams r on 30th.
man do u all want that i shud only concentrate on comp. man this is cbse board i hav other subjects too. this yr only joined this school.
n abt gaining knowledge let me tel u there's a institute around 2 km from my house for learning programming languages such as BASIC C++ COBOL and JAVA. but currently i'm not having time to read n understand them. from 20th my exams r beginning.
also, in case of reading e-buks electricity needs to b there. if u don't trust just join my city nthemn u'll cum to know da condition of electricity.
my ups remains only upto 5 min.
i don't hav any inverter nor generator.
plz let me solve these progs now.
if i ever ask again after my exams like then i requests da administrator to ban me.
PS: If any 1 having code plz provide me.
Anindya
Mr.Incredible said this mach bro The-Incredible wrote:Hi ashu bro..
i havnt yet mentioned a site be4 i posted the tutz.. and i also dont see where mr incredible say he didnt find it useful
Look at the starting page of this thread buddy..neways i completely agree that we all r saying our point.. And i aslo agree with u buddy that even ur saying ur point..there is nothing to feel bad about it.. and im also not blaming any one..BTW i've tried cprogramming.com provided by digit in three incredibly useful sites sectiond but didn't found anything helpful.