while statament

Submitted by dellagd on April 8, 2009 - 8:41pm.

 in this branch of my C++ series, I will show how to use while functions. A while function will be a loop until its parameter ( like the (b < 5) part of a if statement) evaluates false, in which it will exit the while loop and continue with the code. Example:

 

int b = 1;

 

 

while (b <= 10)

{

std::cout <<  " b is less than 10 ";

b++;

}

std::cout <<  "b is now greater than 10";

 

Analysis:

line 1: declares and sets b to 1 in one shot

line 4: declares that there will be a while statement following and the parameter is "b is less than or equal to 10"

line 6: displays " b is less than 10 "

line 7: increments b by 1. So every time the program sees b++, it will add 1 to b (only in C++, not C. For c you will have to use "int temp; temp = b + 1; b = temp;"

line 9: once b is 11 or greater, it displays "b is now greater than 10"

 

This statement can also be very useful if you want to have a infinite loop:

 

while (1)

{}

 

or

 

while (1 == 1)

{}

 

check back for more C++ tutorials.

 

 

 

 

 

 

 

 

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