sample programs on c++

8/22/2019 Sample Programs on c++

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Sample programs continued..

Programs related to

Basic data types

Basic Operators

Operator precedence

Loops

If

Switch

Case

Cin

Cout


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WRITE C++ CODE TO SWAP TWO INTEGER


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#include

using namespace std;int main(){

int a, b, c;couta;

coutb;

c=a;

a=b;b=c;cout


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FIND THE GREATER OF TWO GIVEN NU


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note

cout numberr; // to read through keyboard//***** if you use quotes

//message will be displayed

//extraction operator


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#includeusing namespace std;

int main(){

int num1, num2;cout > num1;cout > num2;

if (num1>num2){

cout


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Write c++ code to find greatest, second greatesand the least of three numbers

//G O S


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//GREATER OF THREE NUMBERS#includeusing namespace std;int main(){int a, b, c;

couta;coutb; // ********* or convert into single line ex: cin>>a>>bcoutc;if(a>b && a>c && b>c){

cout


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else if(b>a && b>c && a>c){cout


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else if(c>a && c>b && a>b){cout


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Operator precedence


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Continued..


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find x

X=5+83

X=6+7>=12&&(3+4)>2*4


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Answer..

X=1

X=0


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//TO FIND THE SUM OF TWO NUMBERS


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int main (){int no1,no2,sum;coutno1;coutno2;sum=no1+no2;cout


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// TO DIVIDE A NUMBER WITH ANOTHER


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int main(){float quotient, remainder;int no1,no2;

cout no1;coutno2;quotient=no1/no2;remainder=no1%no2;cout


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// CLASSIFY THE TOTAL NUMBER OF DAYS INPUT INTO YEAR, WEEK AND


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#includeusing namespace std;int main(){long num, temp, days, week, year;char ch;

do{coutnum;year=num/365;temp=num%365;week=temp/7;days=temp%7;cout


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DISPLAY MONTH CORRESPONDING TOINPUT, USING IF-ELSECONSTRUCT

// DISPLAY MONTH CORRESPONDING TO INPUT,


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USING IF-ELSECONSTRUCT#includeusing namespace std;

int main(){int n;coutn;

while(n>12||n>n;}

if(n==1)cout


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cout


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MONTH DISPLAY USING SWITCH

#include


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int main(){int m;coutm;while(m>12||m


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{case 1 : cout


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//DISPLAY MEANING OF GRADES USING SWICH CASESTRUCTURE

i i


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#include#includevoid main(){clrscr();char ch;

coutch;switch(ch){case 'a':case 'A':cout


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case c :case 'C':cout


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// SIMPLE CALCULATOR FOR 2 FRACTIONS

#include#i l d < i h>


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#include#includevoid main(){float num1,num2,den1,den2,result; char sign, choice;do

{clrscr();cout


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{ case : result ((num1/den1) (num2/den2)); break;case '-': result=((num1/den1)-(num2/den2)); break;case '*': result=((num1/den1)*(num2/den2)); break;case '/': result=((num1/den1)/(num2/den2)); break;default :cout


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// A SAMPLE PROGRAM TO PRINT


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#includeUsing namespace std;Int main (){int num;for (num=1; num


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// TO DETERMINE A PRIME NUMBER.


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#includeUsing namespace std;int main (){long num, fact; int count;cout > num;for ( fact=1, count=0; fact


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// PRINT THE MULTIPLES OF A NUMBER USING A DO-WHILE LOOP;


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#include#includevoid main(){int num, multi=0;clrscr();coutnum;cout


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// PRINT THE MULTIPLICATION TABLE OF A NUMBERUSING A FOR LOOP;


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#include#includevoid main(){int num, multi;

clrscr();coutnum;cout


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// TO DISPLAY SERIES : 2,6,12,20,30,42,56.......N


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#include#includevoid main(){int sum=0, i,n, t;clrscr();coutn;cout


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// PRINT THE FIBONACCI SERIES

#include#includevoid main()


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void main(){/*FIBONACCI SERIES */char choice;do{

clrscr();long double num, a=1, b=0, count;coutnum;cout


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/* SUM OF AN ARITHMETIC PROGRESSION WHOSEFIRST TERM AND LAST TERMS AREENTERED BY THE USER AND THE COMMON DIFFERENCEIS 1 */

#include#includevoid main()


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void main(){long double first, last, sum ; char choice;do{clrscr();

coutfirst;coutlast;for(sum=0;first


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// TO CALCULATE THE SUM OF DIGITS IN A NUMBERRETURN TOINDEX#include#include

void main (){long num, digit, sum;clrscr();cout > num;for (sum=0; num!=0; num=num/10){

digit=num%10;sum=sum+digit;}cout


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julian 365;switch(month){case 1: julian -= 0;case 2: julian -= 31;case 3: if ( (year%100!=0 && year%4==0) ||

year%400==0)julian -= 29;else

julian -= 28;case 4: julian -= 31;case 5: julian -= 30;case 6: julian -= 31;case 7: julian -= 30;

case 8: julian -= 31;case 9: julian -= 31;case 10: julian -= 30;case 11: julian -= 31;case 12: julian -= 30;}

julian+=date;fours=(year-1)/4;hundreds= ear-1 100

// INCREMENT AND DECREMENT OPERATORSRETURN


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RETURNTO INDEX#includeUsing namespace std;Int main();{

clrscr();int num, a,b,c,d;coutnum;a=num;b=num;c=num;d=num;cout


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// SUM OF ALL TERMS OF AN ARRAY INPUT BY THEUSER RETURN TO INDEX#include#include

void main(){clrscr(); long float num[10], sum=0, y=1;cout


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clrscr();//*********input**************cout


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\ \ \ ;cin.getline(str, 70);len=strlen(str);cout


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yp#includevoid main(){clrscr();char str[50];

int flag=1;cout


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exit(0);}cout


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INDEX#include#includevoid main(){

float cube(float);float x,y;clrscr();coutx;y=cube(x);cout


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float large(float array[],int n);clrscr();for(i=0;i


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#includevoid main(){int num;void suffix(int);void prefix(int);clrscr();cin>>num;prefix(num);suffix(num);getch();}void prefix(int n)

{cout


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void pyramid(){static int n=0;int p, m ,q;n++;

for(p=1;p


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int i,j 2,flag 1;if(a>b)i=a;elsei=b;while((j


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#include iostream.h#includeint summat(int first,int count);void main(){clrscr();unsigned long a, b, sum;couta;coutb;sum=summat(a,b);cout


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RETURN TO INDEX#include#includevoid main(){

clrscr();int change(int);int original=10;cout


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#includevoid main(){void swap(int &, int &);int a=7, b=9;

clrscr();cout


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#include#include#includevoid func(void);void main(){clrscr();func();getch();}void func(void){

char name[25];cout


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void err_msg(void);do{coutmarks;

if(marks100)err_msg();}while(marks100);return marks;}void err_msg(void){cout


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for(r3=7; r3


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//TERNARY OPERATOR#include

#includevoid main(){int count=0;int num1=7, num2=4;clrscr();count=(num1


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//NESTED TERNARY OPERATOR RETURN TO INDEX#include

#includevoid main(){int count=0;int num1=2;clrscr();count=(num10)?7:9;cout


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#include

#include using namespace std;int main (){string user_name;cout > user_name;cout


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g#include #include using namespace std;int main ()

{string user_first_name;string user_last_name;cout > user_first_name;cout > user_last_name;string user_full_name;

user_full_name = user_first_name + " " + user_last_name;cout


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onto another, you can use the +sign:#include #include using namespace std;int main ()

{string user_first_name;string user_last_name;cout > user_first_name;cout > user_last_name;string user_full_name = user_first_name + " " + user_last_name;cout


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return is detected

getline( cin, user_first_name, '\n' );

// it neglects new line character

The little secret of floating point numbersI want to let you in on something about floating point numbers like float or doubletheygood in practice, since they can represent a huge range of values. The maximum valuerepresent is about 1.8 10^308. Thats a number with 308 zeros at the end of it. But a dou


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p 8 0 308 308bytesdoesnt that mean it can store only2^32 (18,446,744,073,709,551,616) possible vaLOT of zeros, but its not 308 zeros.) Yes, thats right! In fact, a double can only representquintillion numbers. Thats very largeso large I had to look up what was the name for azeros. But its still not 308 zeros. Floating point numbers allow you to exactly represent on

of the values that are in their actual overall range by using a format similar to scientific nIn scientific notation, you write out numbers in the form 10^. The x usually stores the fof the number, and the y value, the exponent, stores the power to raise the number to.

you could write the distance between the sun and the earth as 9.295610^7miles (approximately 93 million miles).


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This allows the computer to store really big numbers by putting a very large number inBut the non-exponent part cant store 300 digits, it can only store about 15 digits. So yodigits of precision when you work with floating point numbers. If youre dealing with revalues, then the difference between the number the computer stores, and the actua

very small. If youre working with huge values, well, youre going to have large absoluthe relative error is small. For example, if I had only two digits of precision, I could write9.3 10^7 miles from the sun. Thats very close, in relative terms, to the right value (lessBut in absolute terms, its 44 thousand miles! Thats nearly twice the circumference of tcourse, thats using only 2 digits of precision. With 15, you can get a lot closer for numbmillion. In most cases, the inexactness of floating point numbers wont affect you unleserious number crunching or scientific computing, but when it matters, it matters.

String comparisonsC++ string objects allow you to use all of the comparisons that you learned about eathis chapter.


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By comparing string objects, we can write our password checker!#include #include using namespace std;

int main (){string password;cout


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C++ allows you to store the results of comparisons byusing a special type called a bool.10The bool typeis not that different from an integer, but it has one

advantage: it makes it very clear that you are onlyever going to use two possible values, true and false.These keywords, and the bool type, make yourintentions more clear. The result of all comparisonoperators is a Boolean.int x;cin >> x;bool is_x_two = x == 2; // note double-equals forcomparisonif ( is_x_two ){// take some action because x is two!}

Lets look at an example of using Boolean and to create a passwordprogram that checks for both ausername and a password.#include


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#include iostream#include using namespace std;int main (){

string username;string password;cout


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TO INDEX#include#include#include

#includevoid main(){float a,b,c,root1,root2,delta;char choice;do{clrscr();

cout


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delta=(b*b)-(4*a*c);if(delta

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