this slides contains the various forms of conditional statements used in c language.

1. PAPER NAME :CONDITIONAL
STATEMENTS.
STAFF :D.SARITHA
CLASS :I
SEMESTER :I
UNIT :I
TOPIC :PROGRAMMING IN
C

2. Conditional
statements

3. Forms of if statement
Simple if statement.
If…else statement.
Nested if…else statement.
Else .. if ladder.

4. IF STATEMENT
If statement is the decision making statement.
General form:
If (test expression)
{
statement – block;
}
statement-x;

5. IF STATEMENTS
EXAMPLE PROGRAM :
Main()
{
int a,b,c,d;
float ratio;
Printf(“Enter four integer valuesn”);
Scanf(“%d,%d,%d,%d”,&a,&b,&c,&d);
If(c-d !=0) /*execute statement block*/
{
ratio = (float)(a+b)/(float)(c-d);
printf(“ratio =%fn”,ratio);
}
}

6. OUTPUT:
Enter four integer values
12 23 34 45
ratio=-3.181818.

7. IF… ELSE STATEMENTS
If … else statement is the extension of if statement.
General form:
If (test expression)
{
//statement (s)
}
else
{
//statement(s)
}

8. IF ELSE STATEMENTS
EXAMPLE PROGRAM:
#include <stdio.h>
int main()
{
int number;
printf("Enter an integer: ");
scanf("%d",&number);
// True if remainder is 0
if( number%2 == 0 )
printf("%d is an even integer.",number);
else
printf("%d is an odd integer.",number);
return 0;
}

9. IF ELSE STATEMENT
OUTPUT:
Enter an integer: 7
7 is an odd integer.

10. NESTED IF ELSE STATEMENT
The nested if else statement is that contains an if
else inside the body of the another if else
statements.
If the condition 1 is false the statement three will
be executed ;
Otherwise it contains to perform the second test .
If the condition 2 is true

11. GENERAL FORM:
if (testExpression1)
{
// statement(s)
}
else if(testExpression2)
{
// statement(s)
}
else if (testExpression 3)
{
// statement(s)
}
.
.
else
{
// statement(s)
}

12. NESTED IF ELSE STATEMENTS
include <stdio.h>
int main()
{
int number1, number2;
printf("Enter two integers: ");
scanf("%d %d", &number1, &number2);
if (number1 >= number2)
{
if (number1 == number2)
{
printf("Result: %d = %d",number1,number2);
}

13. NESTED IF ELSE STATEMENT
else
{
printf("Result: %d > %d", number1, number2);
}
}
else
{
printf("Result: %d < %d",number1, number2);
}
return 0;
}

14. NESTED IF ELSE STATEMENT
OUTPUT:
if (a > b) {
print("Hello");
}
print("Hi");

15. ELSE IF LADDER
The if...else statement execute two different
codes depending upon whether the test
expression is true or false. Sometimes a choice
has to be made from more than two possibility.
The if else ladder allows you to check for
multiple test expressions and execute various
statement(s).

16. ELSE IF LADDER
If(marks>79)
grade=“Honours”;
Else if(marks>59)
grade=“First division”;
Else if(marks>49)
grade=“second division”;
Else if(marks>39)
grade=“Third division”;
Else
grade+=“fail”;
Printf(“%s/n”,grade);

17. ELSE IF LADDER
OUTPUT:
fail.

18. SWITCH STATEMENT
A switch statement allows a variable to be
tested for equality against a list of values. Each
value is called a case, and the variable being
switched on is checked for each switch case.

19. SWITCH STATEMENT
switch(expression)
{
case value-1:
block-1;
break;
case value-2:
block-2;
break;
case value-3:
block-3;
break;
case value-4:
block-4;
break;
default:
default-block;
break;
}

20. SWITCH STATEMENT
int i = 1;
switch(i)
{
case 1:
printf("A"); // No break
case 2:
printf("B"); // No break
case 3:
printf("C");
break;
}

21. SWITCH STATEMENT
OUTPUT:
A B C