Program Of While Loop In C++

#include<iostream.h>

#include<conio.h>

main()

{

int i;

i=1;

while(i<=10)

{

cout<<"\n"<<i;

i++;

}

getch();

}

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The while loop allows programs to repeat a statement or series of statements, over and over, as long as a certain test condition is true. The format is shown in the box to the right.

The test condition must be enclosed in parentheses. The block of code is called the body of the loop and is enclosed in braces and indented for readability. (The braces are not required if the body is composed of only ONE statement.) Semi-colons follow the statements within the block only.

When a program encounters a while loop, the test condition is evaluated first. If the condition is TRUE, the program executes the body of the loop. The program then returns to the test condition and reevaluates. If the condition is still TRUE, the body executes again. This cycle of testing and execution continues until the test condition evaluates to 0 or FALSE. If you want the loop to eventually terminate, something within the body of the loop must affect the test condition. Otherwise, a disastrous INFINITE LOOP is the result..