C - While Loop, Do While Loop, For Loop
Iteration statements:
Looping or iteration statement is use to execute and repeat a block of statement
depending on the condition.
1. While Loop
2. Do While Loop
3. For Loop
1. While Loop:-
The while loop first
check the condition if the condition is true then the body of the loop
statement will be executed. After execution loop checks condition and execute
statements until condition will be false.
SYNTAX-
while (Condition)
{
Block statement;
Increment / decrement;
}
main()
{
int a=1;
clrscr();
while (a<6)
{
printf(“%d \n”,a);
a=a+1;
}
getch();
}
Output-
1
2
3
4
5
2. do
while Loop:-
do while loop is use
to similar as while loop. In basic difference of while loop first check the
condition then execute the loop block, but do while loop first execute
statement and then check condition. If condition is false in first time then
statement will be executed at least one time.
SYNTAX-
do
{
Block statement1;
Block statement2;
Block statement3;
Block statement4;
Block statement5;
Increment / decrement;
} while (Condition);
EXAMPLE-
main()
{
int a=1;
clrscr (); do
{
printf (“%d \n”,a);
a=a+1;
} while (a<1);
getch();
}
Output-
1
3. for
Loop:-
The for loop is very
flexible and is preferable when there is a simple initialization and increment,
as it keeps the loop control statements close together and visible at the top
of the loop.
SYNTAX-
for (initialization ; test condition ; increment
/decrement)
{
statement -block;
}
EXAMPLE-
main()
{
int a;
clrscr ();
for (a=1;a<6;a++)
{
printf (“%d \n”,a);
}
getch();
}
Output-
1
2
3
4
5
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