C-examples-part-4.rar_beginners

while : 16/ read numbers and print them if it is not zero؟ // demo for WHILE Loop #include <iostream> using namespace std ; void main ( ) { int n = 25 ; while ( n != 0 ) { cout << n << endl ; cin >> n ; } } Another soultion: do .. while : // by do..while loop #include <iostream> using namespace std ; void main ( ) { int n ; do { cin >> n ; cout << n << endl ; } while (n != 0); } 17/ prints numbers raise to fourth power until 9999 #include <iostream> using namespace std ; #include <iomanip> void main ( ) { int numb = 1 ; int pow = 1 ; while ( pow < 9999 ) { cout << setw(2) << numb ; cout << setw(10) << pow << endl ; ++numb ; pow = numb * numb * numb * numb ; } } 18/ // demo for DO Loop #include <iostream> using namespace std ; void main ( ) { long dividend , divisor ; char ch ; do { cout << " Enter Devidend : " ; cin >> dividend ; cout << " Enter Devisor : " ; cin >> divisor ; cout << " Quotient is : " << dividend / divisor ; cout << " , Remainder is : " << dividend % divisor ; cout << " \n Do Again ( y / n ) : " ; cin >> ch ; } while ( ch != 'n' ) ; } 19/ demonstrates IF statement with prime numbers #include <iostream> using namespace std ; #include <process.h> // for exit( ) void main ( ) { unsigned long j , n ; cout << " Enter a numbers : " ; cin >> n ; for ( j = 2 ; j <= n/2 ; j++ ) if ( n % j == 0 ) { cout << n << " is not prime , it's divisible by " << j << endl ; exit ( 0 ) ; // exit from the program } cout << n << " is prime \n " ; } 20/ counts characters and words typed in? #include <iostream> using namespace std ; #include <conio.h> // for getche( ) void main ( ) { int chcount = 0 , wdcount = 1 ; char ch = 'a' ; while ( ch != '\r' ) // Loop until ENTER typed { ch = getche( ) ; // read one character if ( ch == ' ' ) wdcount++ ; else chcount++ ; } cout << " \n Words = " << wdcount << endl ; cout << " Letters = " << chcount - 1 << endl ; }