The document describes various loop and decision making statements in C programming language. It explains the for, while, do-while loops and their syntax and provides simple code examples to illustrate their usage. It also covers if-else, nested if-else, switch decision statements and provides code snippets demonstrating these conditional statements. Finally, it briefly discusses the goto statement in C and provides a sample code using label and goto.

2. C

3. loop
statement

4. loop statement
1. for
for
for
for
for
for (expression1; expression2; expression3)
expression1
statement;
expression2
for (expression1; expression2; expression3)
{ expression3

5. for
4.1 for

6. for
1 10
/* for1.c */
#include<stdio.h>
/* 1 */
#include<conio.h>
/* 2 */
void main(void)
/* 3 */
{
/* 4 */
int num;
/* 5 */
clrscr(
);
/* 6 */
for (num=1; num<=10;

8. 7 for (num = 1; num
<=10; num++)
num 1 num <=
10
8 for 9
8 printf( )
num
9 printf( )
10

9. 2. while
while
for while
while
while
while (expression) statement;
while (expression)
{
statement(s);
}
expression
while

10. while

11. while
1 10
/* while1.c */
#include<stdio.h> /* 1 */
#include<conio.h> /* 2 */
void main(void) /*
3 */
{ /*
4 */
int n=1; /*
5 */
float sum =0 , avg; /*
6 */
clrscr( ); /*
7 */
while ( n < 11 ) /*
8 */
{ /*
9 */
sum+=n; /*
10 */

13. 8 while (n < 11)
while n < 11
loop while
10 11
n < 11
loop while 13
18
10 11
while
sum n 1
13 18
while

14. 3. do while
do while
while
do while
1
do while
do while
do{
statement(s);
} while (expression);
do while
do while
2

15. do while

16. do while
main memu 5
/*dowhile1.c */
#include<stdio.h>
/* 1 */
#include<conio.h>
/* 2 */
void main(void) /*
3 */
{
/* 4 */
char choice;
/* 5 */
clrscr();
/* 6 */
do {
/* 7 */
printf("nn******* MAIN MENU *******n"); /*
8 */
printf("*************************nn"); /*
9 */

18. 7 do
loop do {
} 8 16
1
while 17
loop
17 while (choice!=‘5‘);
choice
5
(‘5‘

19. 4. break
break for while
do while switch
break for
/* break.c */
#include<stdio.h>
/* 1 */
#include<conio.h>
/* 2 */
void main(void)
/* 3 */
{
/* 4 */
int j;
/* 5 */
clrscr();
/* 6 */
for (j=1; j<=20; j++) {

21. 7 for (j = 1; j
<=20; j++)
j 1
1 tab
9 if (j == 10) break;
j 10 10
(break)
loop for
1 20 break
1 10
11 12
for 7

22. 5. continues
continue
for while do while
continue
for
/*continue.c*/
#include<stdio.h>
/* 1 */
#include<conio.h>
/* 2 */
void main(void)
/* 3 */
{
/* 4 */
int j;
/* 5 */
clrscr();
/* 6 */

24. 7 for (j=1; j<=20; j++)
j 1 20 1 tab
9 if (j==5) {j=j+10; continue;}
j 5
5 j 10
(continue) 7
j 1 16
1 20
6 15
11 12
for 7

26. decision statements)
if, if
else, else if ( nested if)
switch
1. if
if
if
if (expression) statement;
if (expression)
{
statement(s);
}

27. if

28. if
/* if1.C. */
#include
<stdio.h>
/*
include
<conio.h>
/*
include
<ctype.h>
/*
Capitalize Keys read from The Keyboard
*/ /*
main()
/*
char

30. include <ctype.h>
toupper( )
any_char
if (any_char >= ‘a’)
any_char
a‘

31. if else
if else
if else
if (expression) {
statementA(s);
}
else {
statementB(s);
}
if else
expression)
A (statementA(s);)
B (statementB(s);)

32. if else

33. if else
/* if_else1.c */
#include
<stdio.h> /*
include
<conio.h> /*
include
<ctype.h> /*
Capitalize Keys read from The Keyboard
*/ /*
main()
/*
char
any_char; /*

35. if (any_char <
‘a’)
a’ Sorry, I
can not capitalize that.
else
toupper( )

36. else if ( nested if)
else if
if else
nested if
nested if else if
else if (expression) {
statementA(s);
}
else if (expression){
statementB(s);
}
else if (expression){
nested if
nested if
nested if

37. nested if
/* nestif1.c */
#include<stdio.h>
/*
include<conio.h>
/*
include<stdlib.h>
/*
void
main(void) /*
int
score, n, i; /*
char

38. if ( score >= 80
) /*
grade =
'A'; /*
else if ( score >= 70
) /*
grade =
'B'; /*
else if ( score >= 60
) /*
grade =
'C'; /*
else if ( score >= 50
) /*
grade =
'D'; /*
else grade =

40. include <stdlib.h>
atoi( )
n = atoi(gets(numstr));
n
for (i=1; i<=n; i++)
n for
loop for
for
score
if ( score >= 80 )

41. else if ( score >= 70 )
score
grade B
else if ( score >= 60 )
score
grade C
else if ( score >= 50 )
score
grade D
else grade = ‘F’;
grade F
score i

42. switch
switch
nested if switch
nested if
switch
switch (expression) {
case expression1:
statement(s); break;
case expression2:
statement(s); break;
…..
case expressionN:
statement(s); break;
default:
statement(s);

43. expression
expression1, expression2, …, expressionN
expression1, expression2, …, expressionN
, , , …, N
break case
switch case
break case
case case
break
default expression
default default
break default
switch
switch
1) switch case)
break case

44. switch
/* switch.c */
#include<stdio.h> /*
include<conio.h> /*
include<stdlib.h> /*
include<ctype.h> /*
void
main(void) /*
int n, i;
/*
float gradepoint;

45. switch(toupper(grade))
{ /*
case
'A': /*
gradepoint = 4.0;
break; /*
case
'B': /*
gradepoint = 3.0;
break; /*
case
'C': /*
gradepoint = 2.0;
break; /*
case
'D': /*
gradepoint = 1.0;

47. n
for (i = 1; i < n; i++)
n
for
loop for
grade
switch
gradepoint
enter

48. loop switch
loop for
switch
A
gradepoint
break) A
B
gradepoint
break) B
C
gradepoint
break) C
D
gradepoint

50. goto statements)
goto label
goto label
goto
label
goto label
goto labelname;
labelname:

51. labelname label
goto label
goto label

52. goto label
label
/* gotolabe.c */
#include<stdio.h>
/*
include<conio.h>
/*
void
main(void)
/*
int i, j, k;
/*
j=i=2;
/*
clrscr( );
/*
loop: k = i*j;
/*

54. loop : quit
: label
loop quit
goto loop;
label loop
if (i < 7)
if
goto quit;
label quit
quit : printf (“ n Thank You !
“); label quit label
Thank You !