# If-Else-If Ladder Statement in Computer Programming: C Language

When series of actions have to be performed based on decisions one–by-one, then the statement used is called if-else-if ladder. In computer programming it is called multi-way decision statement. The if-else-if ladder is a form of nested if-statement. Here, nesting is allowed only in the else part. The orderly nesting of if statement only in the else part is called if-else-if ladder. The syntax of if-else-if ladder is shown below:

Syntax:

if(condition1)
statement(s);
else if(condition2)
statement(s);
else if(condition3)
statement(s);
-
-
-
else if(conditionn)
statement(s);
else
statement(S);

In this statement the conditions condition1, condition2 etc. of if-else-if ladder are evaluated to true, the corresponding statement is executed and control comes out of the entire if-else-if ladder executing the rest statements that come after the if-else-if ladder.

If all the conditions are evaluated to false, then the last statement is executed, and the control comes out of if-else-if ladder and the rest statements that come after the if-else-if ladder are executed.

Problem:

Let consider a problem to display the grade obtained by a student based on the marks. The criteria to find the grade based on marks as follows:
0 to 34        F
35 to 44      E
45 to 59      D
60 to 69      C
70 to 79      B
80 to 89      A
90 to 100    A+

Algorithm:
Step2:    if(Marks<=34)
else if(Marks<=45)
else if(Marks<=59)
else if(Marks<=69)
else if(Marks<=79)
else if(Marks<=89)
else
[End of if-else-if]
Step3:    Exit

Here's the C program to solve the above problem.

main()
{
int marks;
clrscr();
printf(“Enter the student’s obtained marks here:\n”);
scanf(“%d”,&marks);
if(marks<=34)
else if(marks<=45)
else if(marks<=59)
else if(marks<=69)
else if(marks<=79)
else if(marks<=89)
else
getch();
}

Output