## Nested if / if-else statements

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Sometimes we require to execute a set of statements based on the TRUEness or FALSEness of two or more conditions. In such a situation we can use nested if-statement or nested if-else statements.

Syntax- There can be infinite number of syntax for nested if-statement and nested if-else statements.

 Syntax-1 Syntax-2 if ( condition){             if (condition)             {                        Statement(s);             }} if ( condition){             if (condition)             {                           if (condition)                           {                                         Statement(s);                            }             }} Syntax-3 Syntax-4 if ( condition){             if (condition)             {                           if (condition)                           {                                  And so on…                           }             }} if ( condition){             Statement(s);}else{                if(condition)                {                        Statement(s);                }} Syntax-5 Syntax-6 if ( condition){                if(condition)                {                        Statement(s);                }}else{           Statement(s);} if ( condition){                if(condition)                {                        Statement-1(s);                }                else                {                        Statement-2(s);                }}else{           Statement-3(s);} Syntax-7 Syntax-8 if ( condition){                Statement-3(s);}else{                if(condition)                {                        Statement-1(s);                }                else                {                        Statement-2(s);                }} if ( condition-1){                if(condition-2)                {                        Statement-1(s);                }                else                {                        Statement-2(s);                }}else{                if(condition-3)                {                        Statement-3(s);                }                else                {                        Statement-4(s);                }}

Example-1

Marks of 5 subjects are input through the keyboard. Write a Program in C to print the total marks, percentage and division.

/* Program to display total marks, percentage and division [division.c] */
#include < stdio.h >
#include < conio.h >

void main ( )
{
// Variable Declaration
int s1, s2, s3, s4, s5, total ;

float per ;
clrscr ( );

// Input
printf ( “ \n Enter the marks of Physics \n “ );
scanf ( “ %d “, &s1 );
printf ( “ \n Enter the marks of Chemistry \n “ );
scanf ( “ %d “, &s2 );
printf ( “ \n Enter the marks of Maths \n “ );
scanf ( “ %d “, &s3 );
printf ( “ \n Enter the marks of English \n “ );
scanf ( “ %d “, &s4 );
printf ( “ \n Enter the marks of Computer Science \n “ );
scanf ( “ %d “, &s5 );

// Processing and Output
total = s1 + s2 + s3 + s4 +s5 ;
per = total / 5.0 ;
printf ( “ \n Total Marks = %d“, total );
printf ( “ \n Percentage = %f “, per );
if ( per > = 75 )
{
printf ( “ \n Distinction \n “ );
}
if ( per > = 60 )
{
if ( per <  75)
printf ( “ \n First Division \n “ );
}
if ( per > = 45 )
{
if ( per <  60)
printf ( “ \n Second Division \n “ );
}
if ( per > = 33 )
{
if ( per <  45)
printf ( “ \n Third Division \n “ );
}
if ( per < 33 )
{
printf ( “ \n Fail \n “ );
}
getch ( );

}