Programming in C - 03 - Basic Syntax

8/17/2019 Programming in C - 03 - Basic Syntax

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Overview

Semicolon

Variable Declarations Code Blocks

Functions

Comments



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Semicolon ;

Terminator

• Signifies the end of a statement• Many statements end with a ‘;’ and some do n

• Can also be used to “stack” statements



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Variable Declaration

How to declare a variable in C

= ;



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int num = 10;






int num = 10;

Variable Type






int num = 10;

Variable Name






int num = 10;

Expression (Value)






int num = 10;

Terminator






int num;

num = 10;






int num;

num = 10; Variable declaration

Set variable value



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Terminator


How to stack variable declarations

int x = 10;int y = 1 + 2;



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How to stack variable declarations

int x = 10;int y = 1 + 2;

Same as

int x = 10, y = 1 + 2;

V i bl D l i



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Whitespace is ignored by the compiler

int y = 1 + 2;

int y=1+2;

Same ex

C d Bl k



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Code Blocks

Sections code that belongs to a particular str

{

}

Start Code Block

End Code Block

C d Bl k



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Code Blocks

Sections code that belongs to a particular structure

int main(){

if (x == y)

{

}

return 0;

}

Start MainBlock

End MainBloc

Start If Co

End If C

F ti D l ti



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Function Declaration

How to declare a function

(


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(


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(


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(


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(


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Variable Type


(


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Local VariableName


(


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ParameSeparato


(


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Next parame


(


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Calling a Function

();

Power(2, 3);

or

int x = Power(2, 3);

Calling a Function



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Calling a Function

();

Power(2, 3);

or




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Writing a Comment


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Writing a Comment


//Comment a single line with two sl

//Print the statement below

printf(“The result is %d\n“, x);

//Reset the variable ‘x’ to 0.

x = 0;

Writing a Comment



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Writing a Comment


/*

Block comments can span multiple l

Next we will print the statement b

*/

printf(“The result is %d\n“, x);

x = 0; //Reset the variable ‘x’ to



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Programming

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Programming in C - 03 - Basic Syntax

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