C language - Class 9 : Control statements - Part 1 (If, if-else, nested if, else-if ladder)

Control statements in C :

Decision making statements OR structures are also called as Control structures.
They are used when the programmer wants to check OR test a logical condition. For Ex : 3 Greater than 2
In decision making statements, a statement OR a group of statements are executed when condition is true. 
And we also write other statements when the condition evaluates to false.
Normally we make use of logical operators in the test conditions.

Control statements in C

if statement
if-else statement
nested if and nested if-else
else if ladder

if statement
if statement checks the given condition.
if test expression is evaluated to true, statements inside the body of if are executed.
if test expression is evaluated to false, statements inside the body of if are skipped.

Syntax:
if (test condition)
{
one or more
Statements ;
}

if else statement checks the given condition.
if test expression is evaluated to true, statements inside the body of if are executed.
if test expression is evaluated to false, statements inside the body of else are executed.

if (test condition)
{
one or more
Statements ;
}
else
{
one or more
Statements ;
}

Conditional Operator :
? : is called as Conditional Operator.
Syntax :
Exp1 ? Exp2 : Exp3;

Exp1 is evaluated. If it is true, then Exp2 is evaluated and becomes the value of the entire ? expression.

If Exp1 is false, then Exp3 is evaluated and its value becomes the value of the expression.

if (test condition)
{
if (test condition)
{
one or more
Statements ;
}

one or more
Statements ;
}

Nested if else
if (test condition)
{
if (test condition)
{
one or more Statements;
}
else
{
one or more Statements;
}
}
else
{
one or more
Statements;
}

Nested if else
if (test condition)
{
if (test condition)
{
one or more Statements;
}
else
{
one or more Statements;
}
}
else
{
one or more
Statements;
}

else if ladder :

if (test condition 1)
{
one or more Statements;
}
else if (test condition 2)
{
one or more Statements;
}
else if (test condition 3)
{
one or more Statements;
}
else if (test condition 4)
{
one or more Statements;
}
else
{
one or more Statements;
}

switch case :
switch case is like check for the match and execute a block.
So we give a value to a variable to match.
The switch statement tests the value of a given variable against the list of case values.
When a match is found, a block of statements associated with that case is executed.

switch (variable)
{
case (value 1) : one or more Statements;
break;

case (value 2) : one or more Statements;
break;

case (value 3) : one or more Statements;
break;
…
...

default : one or more Statements;
}

break :

break is a keyword that breaks out of the code block.
In this case, break prevents the program executing the code in all the other case statements.
An important thing to note about the switch statement is that the case values may only be constant integral expressions

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[preethiyadav]

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[RohitYadav-oedm]

what if we put scanf(); before printf statement. will it still work?

[saurabhmishra]

can you upload full c programming laguage of class 9.and help me in program making