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PHP Conditional statement

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PHP Conditional statement tutorials

Introduction of Programming 



What is Program? 

  1. sequence of instruction written for specific purpose
  2. Like program to find out factorial of number
  3. Can be written in higher level programming languages that human can understand
  4. Those programs are translated to computer understandable languages code gceo like bis 
  5. Most prior programming language was 'C’
  6. Compiler will convert higher level language code to lower Ian language are called syntax binary Code
  7. Rules & format that should" be followed while writing program . Consider program to print Hello!" on screen 
void main()
{
      printf("Hello!");
}

Void main() function an entry point of compilation
Part within two curly brackets, is body of function

 Printf(), function to print sequence of characters on screen 

Any programming language having three part 

o Data types
o Keywords
o Operators

  •  Data types are like int, float, double
  • Keyword are like printf, main, if, else
  •  The words that are pre-defined for compiler are keyword
  • Keywords can not be used to define variable
  •   We can define variable of data type c Like int a; then 'a' will hold value of type int and is called variable
  • Programs can have different type of statements like conditional statements
  •   Conditional statements are for checking some condition
  • Conditional Statement
  • Conditional statements controls the sequence of statements, depending on the condition 
  • Relational operators allow comparing two values.
1. == is equal to
2.! = not equal to
3. < less than
4. > greater than
5. <= less than or equal to
6. >= greater than or equal to 

Simple "if" statement

It execute if condition is TRUE


Syntax:

 if (condition)
{
Statement 1;
}
……..
Statement n;


Code:

main()
{
int a,b;
printf("Enter a,b values:");
scanf("%d %d",&a,&b);
 if(a>b)
 {
 printf" n a is greater than b");
}

Output
 Enter a,b values:20 10
 a is greater than b 


If-else Statement

It execute IF condition is TRUE IF condition is FALSE it execute ELSE part

 Syntax:

if(condition)
{
Staternent 1; ……
Statement n;
}
Else
{
 Statement 1; …..
Statement n;
}


code:

main()

int a,b;
printf("Enter a,b values:");
scanf("%d %d",&a,84b);
if(a>b)
{
 printf("\n a is greater than b");
}
else
{
printf("\nb is greater than b");
}

Output
Enter a,b values:10 20
b is greater than a

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If-else if statement : It execute IF condition is TRUE IF condition is FALSE it checks ELSE IF part .ELSE IF is true then execute ELSE IF PART. This is also false it goes to ELSE part.

Syntax:


if(condition)
{
 Statementn;
}
else if(condition)
{
 Statementn;
}
else
{
}

Code :

main()
Statement n;
int a,b;
printf("Enter a,b values:");
scanf("%d %d",&a,&b);
 if(a>b)
{
printf("\n a is greater than b");
}
else if(b>a)
{
printf("\nb is greater than b");
}
 } else
{
printf("\n a is equal to b");
}
Output

Enter a,b values:10 10
a is equal to b

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