Nested if-:

Nested of 'if ' means one ' if ' is enclosed with in another ' if '. In nested if, every ' if ' have an else statement. 
Syntax-:
if(condition)

  if(condition)

  statement-1;

  else

  statement-2;

else
statement-3;
}
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Example-:
#include<stdio.h>
#include<conio.h>
main()
{ int a=0,b=0,c=0;
   printf("Enter the value of a,b,c);
   scanf("%d %d %d",&a,&b,&c);
   if(a>b)
     {if(a>c)
     printf("\n %d is largest",a);
     else
     printf("\n %d is largest",c);
     }
else if(b>c)
 printf("\n %d is largest",b);
else
printf("\n %d is largest",c);
getch();
}
output-: Enter the value of a,b,c 10
               15
               22
               22 is largest

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