1. Print Nos. From 1 to 10
main( )
{
int i = 1 ;
while ( i <= 10 )
{
printf ( ”%d”, i ) ;
}
}
a = a * 10 ;
a *= 10 ;
b = b % 5 ;
b %= 5 ;
i += 1 ;
Same as i++, +
+i, i = i + 1
+= -= *= /= %= += -= *= /= %= CCoommppoouunndd AAssssiiggnnmmeenntt OOppeerr..

2. One More Way
main( )
{
int i = 1 ;
while ( )
{
Any Non-Zero
number
printf ( ”%d”, i ) ;
i++ ;
}
}
1 /* Repeat infinite times */

3. Applying Brakes
main( )
{
break - Terminates Loop
exit( ) - Terminates Program
break - Terminates Loop
exit( ) - Terminates Program
int i = 1 ;
while ( 1 ) /* Repeat infinite times */
{
printf ( ”%d”, i ) ;
i++ ;
}
}
if ( i > 10 )
break ;
if ( i > 10 )
exit( ) ;
if ( i > 10 )
exit( ) ;
Keyword

4. Calculate
n!
nS
i
i = 1
xn
Running product
1 * 2 * 3 * 4 *….n
1 + 2 + 3 + 4 +.…n
2 * 2 * 2 * 2 *….n
Running sum
Running product

5. Running Sum And Products
int s, p, pr, i, n ;
i = 1 ;
while ( i <= n )
{
s = 0 ; p = 1 ; pr = 1 ;
s = s + ;
}
i
p = p * i ;
pr = pr * 2 ;
1 + 2 + 3 + 4 +.…n RS
1 * 2 * 3 * 4 *….n RP
2 * 2 * 2 * 2 *….n RP
1 + 2 + 3 + 4 +.…n RS
1 * 2 * 3 * 4 *….n RP
2 * 2 * 2 * 2 *….n RP
main( )
{
scanf ( ”%d”, &n ) ;
i++ ;
printf ( ”%d %d %d”, s, p, pr ) ;
}
i s
1 0
2 1
3 3
4 6
5 10
6 15
5

6. x x3 x5 x7 x9
1! 3! 5! 7! 9!
main( )
{
x x3 x5 x7 x9
1! 3! 5! 7! 9!
scanf ( ”%f”, &x ) ;
while ( i <= 10 )
{
i = 1 ; s = 0 ;
calculate numerator
calculate denominator
term = numerator / denominator
Add / subtract alternate terms to/from s
i++ ;
}
print ( s ) ;
}

7. main( )
{
scanf ( ”%f ”, &x ) ;
i = 1 ;
while ( i <= 10 )
{
OK ?
float x, s, n, d, t ; int i, j, k, n ;
i++ ;
}
printf ( ”%f ”, s ) ;
}
x1 x3 x5
1! 3! 5!
x1 x3 x5
1! 3! 5!
i j
1 1
2 3
3 5
4 7
5 9
.. ..
j = 2 * i - 1 ;
while ( k <= j )
{
d = d * k ; n = n * x ;
k++ ;
}
k = n = d = 1 ;
t = n / d ;
( i % 2 == 0 ) ? s = s - t : s = s + t ;
Anything
wrong ?
s = 0 ;
Associates
from R to L

8. Prime Number or Not
main( )
{
printf ( ”Enter any number” ) ;
scanf ( ”%d”, &n ) ;
...
...
}
13
2 3 4 .. .. .. 12
int n ;
13

9. Prime No.
main( )
{
int n ;
printf ( ”Enter any number” ) ;
scanf ( ”%d”, &n ) ;
}
13
2 3 4 .. .. .. 12
int i = 2 ;
while ( )
i <= n - 1
{
if ( n % i = = 0 )
printf ( ”Not a prime number” ) ;
else
i++ ;
}

10. main( )
{
int n, i = 2 ;
printf ( ”Enter any number” ) ;
scanf ( ”%d”, &n ) ;
while ( i <= n - 1 )
13
{
if ( n % i == 0 )
printf ( ”Not a prime number” ) ;
else
i++ ;
}
}
if ( i == n )
break ;
{
}
printf ( ”Prime number” ) ;

11. Generate Prime Numbers
2 17
3 19
5 23
7 .
11 .
13 199

12. i = ++a && ++b && ++c ;
j = ++a || ++b || ++c ;
i = ++a && ++b && ++c ;
j = ++a || ++b || ++c ;
What Would Be The O/P
b = ( b = ( ++++ii &&&& ++++jj )) |||| ++++kk ;;
main( )
{
int i = 5, j = 4, k = -1, a, b ;
a = i && !j ;
b = ++i && ++j || ++k ;
printf ( ”%d %d %d %d %d”, a, b, i, j, k ) ;
}
bb == ++++ii &&&& (( ++++jj |||| ++++kk ));;
00 1 6 5 -1

13. Loop Control Instructions
while
for
do-while

14. The while Loop
main( )
{
int m1, m2, m3, avg, i ;
i = 1 ;
while ( i = 10 )
{
scanf ( ”%d%d%d”, m1, m2, m3 ) ;
avg = ( m1 +m2 + m3 ) / 3 ;
printf ( ”%d”, avg ) ;
i++ ;
}
}
Init Test Incr
Test
Test
Incr
Incr
Test Incr
.. ..
.. ..

15. The for Loop
main( )
{
int m1, m2, m3, avg, i ;
scanf ( ”%d%d%d”, m1, m2, m3 ) ;
avg = ( m1 + m2 + m3 ) / 3 ;
printf ( ”%d”, avg ) ;
}
( )
Init Test Incr
Test
Test
Incr
Incr
Test Incr
.. ..
for .. .. i = 1 ; i = 10 ; i++
{
}

16. Comparision - I
Infinite Loop Finite Loop
main( )
{
int i = 1 ;
while ( i = 10 )
statement1 ;
statement2 ;
statement3 ;
i++ ;
}
main( )
{
int i ;
for ( i = 1 ; i = 10 ; i++ )
statement1 ;
statement2 ;
statement3 ;
}

17. Comparison II
Infinite Loop Finite Loop
main( )
{
int i = 1 ;
while ( i = 10 ) ;
{
statement1 ;
statement2 ;
statement3 ;
i++ ;
}
}
main( )
{
int i ;
for ( i = 1 ; i = 10 ; i++ ) ;
{
statement1 ;
statement2 ;
statement3 ;
}
}

18. Print Nos. From 1 to 10
main( )
{
int i ;
for ( i = 1 ; i = 10 ; i++ )
printf ( ”n%d”, i ) ;
}

19. Dropping Initialisation
main( )
{
int i = 1 ;
for ( ; i = 10 ; i++ )
printf ( ”n%d”, i ) ;
}

20. Dropping Incrementation
main( )
{
int i = 1 ;
for ( ; i = 10 ; )
{
printf ( ”n%d”, i ) ;
i++ ;
}
}

21. Dropping Condition
main( )
; ; Necessary
{
int i = 1 ;
for ( ; ; )
{
printf ( ”%d”, i ) ;
i++ ;
}
}
if ( i 10 )
break ;
printf ( ”%d”, i++ ) ;
if ( ++i 10 )

22. Comparison III
Error Infinite Loop
main( )
{
int i = 1 ;
while ( )
{
statement1 ;
statement2 ;
statement3 ;
}
}
main( )
{
int i = 1 ;
for ( ; ; )
{
statement1 ;
statement2 ;
statement3 ;
}
}

23. Drawing Boxes
012..... 24
0 1 2 … … … … 79
(10,20)
TTiipp :: (( 1100,, 2200 ))
(23,70)
( row number, col number )

24. Box Drawing Characters
Character ASCII value
218
191
192
217
196
179

25. To Begin With...
main( )
{
clrscr( ) ;
printf ( ”%c”, 218 ) ;
…
…
}

26. main( )
{
clrscr( ) ;
}
int r, c ;
(10,20)
gotorc ( 10, 20 ) ; printf ( ”%c”, 218 ) ;
gotorc ( 10, 70 ) ; printf ( ”%c”, 191 ) ;
gotorc ( 23, 20 ) ; printf ( ”%c”, 192 ) ;
gotorc ( 23, 70 ) ; printf ( ”%c”, 217 ) ;
for ( r = 11 ; r 23 ; r++ )
{
gotorc ( r, 20 ) ; printf ( ”%c”, 179 ) ;
gotorc ( r, 70 ) ; printf ( ”%c”, 179 ) ;
}
for ( … … … .. )
{
}
(23,70)

27. #include ”goto.c”
main( )
{
int r, c ;
clrscr( ) ;
gotorc ( 10, 20 ) ; printf ( ”%c”, 218 ) ;
.. ..
.. ..
for ( r = 11 ; r 23 ; r++ )
{
.. ..
}
for ( … … … )
{
}
}

28. 9966 -- 9999
CChhaapptteerr 33