using tips If-Else statement in C programming

1. if the expression is evaluated with true then it is replace with 1 otherwise  replaced with 0.

Example : if( 5>3)

                 Printf(“YES”);

                        Else

                 Printf(“no”);

2. if multiple statement are given in the if expression the order of evaluation is form left to right.

Example  int a=5;

                If (a++ ,a=a-5,a--;a)

                  Printf(“yes”);

                Else

                        Printf(“NO”);

3.Nested if can be replace with logical && operator

   Example :-

       Int a=1,b=2,c=3;

      If(a==1)

   If(b==2)

If(c==3)

 Printf(“BOSS”);

4. ternary operator (?:) sometimes replaced the if statement .

example : if (a>65)

  printf(“hi”;

else

 printf(“bye”);

using ternary operator:

a>65?printf(“hi”);printf(“bye”);

5. hanging if is not allowed , and it always cause an error misplaced else

       example:

   if(6>2)

printf(“yes”);

printf(“no”);

else

printf(“bye”);

6. ‘else ‘ is optional part of the if statement

7. else(:) is compulsory in conditional operator .

example :

 64>3 ? printf(“yes”) : printf(“”);

8. nested if is differ from multiple if

example :

nested if

int a=1,b=2,c=3;

if(a==1)

if(b==2)

if(c==3)

printf(“BOSS”);

multiple if

int avg=75;

if(( avg>=60)

printf(“first”);

if (avg>=40 && avg<60)

   printf(“second”);

if(avg>=30 && avg<40)

9. There are other conditional statement like #if , #else , #elseif etc used with preprocessor directive
10. alwaysuse the “else  if” instead of multiple if.

Int avg=75;

If(avg>=60)

 Printf(“first”);

If(avg>=40 && avg<60)

 Printf(“second”);

If (avg>= 30 && avg<40)>

Use else if

Int avg=75;

If(avg>=60)

 Printf(“first”);

Else If(avg>=40 )

 Printf(“second”);

Else (avg>= 30 )

…………..