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Looping
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By using special loop keywords,you can loop (jumping for those assembly junkies) through your code.
These include following categories:
- for loop
- while loop
- do while.
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For Loop
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The for statement allows for the controlled loop.
The syntax for for loop is as follows:
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for (start condition; continue condition; re-evaluation)
program statement;
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The foollowing program shows the use of for loop which prints number from 0 to 10
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* Sample program using a for statement */
#include <stdio.h>
int main(void)
{
int count;
for (count = 1; count <=10; count = count + 1)
printf("%d", count);
printf(\n);
return 0;
}
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O/P:
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While Loop
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For repeating C statements whiles a condition is true,the while provides a the necessary mechanism.
The syntax for while loop is as follows:
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while (condition)
program statement;
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The foollowing program shows the use of while loop which prints number from 0 to 10
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/* Sample program including the while loop */
#include <stdio.h>
int main(void)
{
int loop = 0;
while (loop <=10)
{
printf("%d", loop);
++loop
}
return 0;
}
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The do while statement
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The do {} while statement allows a loop to continue whilst a condition evaluates as TRUE (non-zero value).
The loop will exacute at least once
The syntax is as follows
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do {
/* do stuff */
} while (statement);
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The following program reverse a number using do while loop
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/* Demonstration of the do..while loop */
#include <stdio.h>
int main(void)
{
int value, r_digit;
printf(Enter a number to be reversed.\n);
scanf(%d, &value);
do
{
r_digit = value % 10;
printf("%d", r_digit);
value = value / 10;
} while (value != 0);
printf(\n);
return 0;
}
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Difference between while and do while loop
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The do statement is similar to the while statement except that its termination condition is at the end of the body of the loop only.
Thus, you want to use a do statement,if you want to perform the body of the loop at least once, regardless of the condition.
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