[Guide & Examples] C++

// coded by newt
// not compatible with programs running c++ yet; for educational purposes only
// all codes below (except // codes) are original and thought of in the brightest way possible
// they are all examples, so feel free to modify them in any manner if possible


// syntax of ternary operators:
(condition) ? (if_true) : (if_false)

// example of a ternary operator:
int x=15;
int y=(x==15)? 10:20; //here it means if x is equal to 15 then y will be assigned 10 otherwise 20
cout<<(x<=10)?"Good";"Not so good";

// syntax of the IF, ELSE construct:
if(condition)
{
    statement 1;
}
else
{
    statement 2;
}

// example of the IF, ELSE construct:
if(a>b)
{
    cout<<"A is greater than B";
}
else
{
    cout<<"B is greater than A";
}

// first example of the nested IF, ELSE/IF, ELSE ladder:
if(condition1)
{
    statement 1;
}
else if(condition2)
{
    statement 2;
}
else
{
    statement 3;
}

// second example of the nested IF, ELSE/IF, ELSE ladder:
if(condition1)
if(condition2)
.
.
.
if(condition3)
{
    statement 1;
}
else
{
    statement 2;
.
.
.
}
else
{
    statement 3;
}
else
{
    statement 4;
}

// syntax of the SWITCH, CASE construct:
switch(switch variable)
{
    case <constant1>: statement1;
        .
        .
        .
        statement n;
        break;
        .
        .
        .
    case <constantn>: statement1;
        .
        .
        .
        statement n;
        break;
        .
        .
        .
        default : statement1;
        .
        .
        .
        statement n;
}

// example of the default case option in the SWITCH, CASE construct:
switch(choice)
{
    case 1: cout<<"Sum: ";
        cout<<a+b<<end1;
        break;
    case 2: cout<<"Difference: ";
        cout<<a-b<<end1;
        break;
    case 3: cout<<"Product: ";
        cout<<a*b<<end1;
        break;
    case 4: cout<<"Quotient: ";
        cout<<a/b<<end1;
        break;
    case 5: cout<<"Remainder: ";
        cout<<a%b<<end1;
        break;
    default: cout<<"Invalid choice!";
}

// to accept a number from the user and check if it is an odd or even number:
#include<iostream.h>
#include<conio.h>
void main()
{
    clrscr();
    int x;
    cout<<"Enter a number";
    cin>>x;
    if(x%2==0)  // checks if the remainder is 0
    cout<<"The number you entered is an even number";
    else
    cout<<"The number you entered is an odd number";
}

// to accept and alphanumeric value from the user and check if it is in upper case or lower case:
#include<iostream.h>
#include<conio.h>
void main()
{
    clrscr();
    char alpha;
    cout<<"Enter an alphabet";
    cin>>alpha;
    if(alpha>='a' && alpha<='z')
    cout<<"The alphabet you entered is in lower case";
    else if(alpha>='A' && alpha<='Z')
    cout<<"The alphabet you entered is in upper case";
}

// to accept marks of a student in 5 subjects:
#include<iostream.h>
#include<conio.h>
void main()
{
    int m1,m2,m3,m4,m5,per;
    char grade;
    cout<<"Enter your marks in any five subjects: "<<end1;
    cin>>m1>>m2>>m3>>m4>>m5;
    per = (m1+m2+m3+m4+m5)/500 * 100;
    if(per>=90)
        grade='A';
    else if(per>=80)
        grade='B';
    else if(per>=70)
        grade='C';
    else if(per>=60)
        grade='D';
    else if(per>=50)
        grade='E';
    else
        grade='F';
    cout<<"Your grade is: "<<grade;
}

// to accept a number from the user and check if it is a big, medium or small number:
#include<iostream.h>
#include<conio.h>
void main()
{
    clrscr;
    int num;
    cout<<"Enter a number between 0 and 100";
    cin>>num;
    if num>>100;
    cout<<"The number you entered is a big number";
    else if num>>90;
    cout<<"The number you entered is a big number";
    else if num>>80;
    cout<<"The number you entered is a big number";
    else if num>>70;
    cout<<"The number you entered is a medium number";
    else if num>>60;
    cout<<"The number you entered is a medium number";
    else if num>>50;
    cout<<"The number you entered is a medium number";
    else if num>>40;
    cout<<"The number you entered is a medium number";
    else if num>>30;
    cout<<"The number you entered is a medium number";
    else if num>>20;
    cout<<"The number you entered is a small number";
    else if num>>10;
    cout<<"The number you entered is a small number";
    else if num>>0;
    cout<<"The number you entered is zero";
    else
    cout<<"Incorrect number! Enter a number divisible by 10";
}

// more c++ codes coming soon!


// congratulations! you have finished newt's c++ example guide!
// if you read through everything and used some of it - GREAT!
// if you just scrolled to the end - LOSER!

// copyright 2014 newt drost
// distributed by the newt productions