C++ Tutorial/Operators statements/while — различия между версиями
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Версия 14:21, 25 мая 2010
Содержание
- 1 A while true loop
- 2 Calculate the sum of the integers from 1 to 10 using while loop
- 3 Counter-controlled repetition
- 4 demonstrates WHILE loops using fibonacci series
- 5 Display all printable characters including the extended character set
- 6 Looping with while
- 7 Skip the body of the while loop when the condition is false
- 8 Use three conditions in while statement
- 9 While statement with "and"&&
A while true loop
#include <iostream>
int main()
{
int counter = 0;
while (1)
{
counter ++;
if (counter > 10)
break;
}
std::cout << "counter: " << counter << "\n";
return 0;
}counter: 11
Calculate the sum of the integers from 1 to 10 using while loop
#include <iostream>
using std::cout;
using std::endl;
int main()
{
int sum;
int x;
x = 1;
sum = 0;
while ( x <= 10 )
{
sum += x;
x++;
}
cout << "The sum is: " << sum << endl;
return 0;
}The sum is: 55
Counter-controlled repetition
#include <iostream>
using std::cout;
using std::endl;
int main()
{
int counter = 1;
while ( counter <= 10 )
{
cout << counter << " ";
counter++;
}
cout << endl;
return 0;
}1 2 3 4 5 6 7 8 9 10
demonstrates WHILE loops using fibonacci series
#include <iostream>
using namespace std;
int main(){
const unsigned long limit = 4294967295;
unsigned long next=0;
unsigned long last=1;
while( next < limit / 2 )
{
cout << last << " ";
long sum = next + last;
next = last;
last = sum;
}
cout << endl;
return 0;
}Display all printable characters including the extended character set
#include <iostream>
using namespace std;
int main()
{
unsigned char ch;
ch = 32;
while(ch) {
cout << ch;
ch++;
}
return 0;
}!"#$%&"()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno
pqrstuvwxyz{|}.....
Looping with while
#include <iostream>
int main()
{
int counter = 0;
while(counter < 5)
{
counter++;
std::cout << "Looping! ";
}
std::cout << "\nCounter: " << counter << ".\n";
return 0;
}Looping! Looping! Looping! Looping! Looping! Counter: 5.
Skip the body of the while loop when the condition is false
#include <iostream>
int main()
{
int counter = 3;
while (counter > 0)
{
std::cout << "Hello!\n";
counter--;
}
std::cout << "counter is OutPut: " << counter;
return 0;
}Hello! Hello! Hello! counter is OutPut: 0
Use three conditions in while statement
#include <iostream>
int main()
{
unsigned short small = 1;
unsigned long large = 123;
const unsigned short MAXSMALL=65535;
std::cout << "small: " << small << "...";
// for each iteration, test three conditions
while (small < large && large > 0 && small < MAXSMALL)
{
std::cout << ".";
small++;
large-=2;
}
std::cout << "\nSmall: " << small << " Large: " << large << std::endl;
return 0;
}small: 1............................................ Small: 42 Large: 41
While statement with "and"&&
#include <iostream>
using namespace std;
int main()
{
int len;
cout << "Enter length (1 to 79): ";
cin >> len;
while(len>0 && len<80) {
cout << ".";
len--;
}
return 0;
}