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In nested if-else decision-making statement of C language, an if-else statement is nested inside an if statement, hence this control structure is named nested if-else.

Working of nested if-else

If the condition of outer if statement is false then the statement connected to its else(optionally declared) is executed and the nested if-else is not executed at all.

The statement connected to the if of the nested if-else is only executed when -:

• The condition of outer if statement is true and,
• The condition of this nested if statement is also true.

If condition of this nested if is false then the statement with its connected else is executed.

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Nested if-else example

/* nested if-else example */


#include<stdio.h>
int main()
{

if(99<100)
{
	if(99<98)
	 	printf("99 is less than 100 & 99 is also less than 101");
	else
		printf("99 is less than 100 but 99 is not less than 98");
}
else 
	printf("99 is not less than 100");
	
return 0;
}

Output

99 is less than 100 & 99 is also less than 101

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