January 6, 2019 ocjp

if statement in C Language

Decision Making

For Decision making we can use if statement in C Language. If statement is used for conditional execution of statements. Basic Syntax of is:

if(condition)
{
true-part here
}

if(condition)
{
true-part;
}
else
{
false-part;
}

if(condition 1)
{
True-Part of Condition 1
}
else if(condition 2)
{
True Part of Condition 2
}
else
{
false-part
}

#include<stdio.h>
#include<conio.h>
void main()
{
	int x;
	clrscr();
	printf("\nEnter No :");
	scanf("%d",&x);
	if(x>0)
	{
	printf("\nX is Greater Than Zero");
	}
	getch();
}
/*
if we provide positive value of x, then output will be X is Greater Than Zero, otherwise nothing in output. 
For x=0 it will not display anything as no condition is fulfilled.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
	int x;
	clrscr();
	printf("\nEnter No :");
	scanf("%d",&x);
	if(x>0)
	{
	printf("\nX is Greater Than Zero");
	}
	else
	{
	printf("\nX is Neg.");
	}
	getch();
}
/*
For this program if we provide 0 or negative values, then output will be X is Neg". And for Positive value it will show X is Greater than Zero
*/

Now we will discuss about multiple conditions in If. It is also called else if ladder.

#include<stdio.h>
#include<conio.h>
void main()
{
	int x;
	clrscr();
	printf("\nEnter No :");
	scanf("%d",&x);
	if(x>0)
	{
	printf("\nX is Greater Than Zero");
	}
	else if(x<0)
	{
	printf("\nX is Neg.");
	}
	else
	{
	printf("\nX is Zero");
	}
	getch();
}
/*
Here if  x is positive then Output :X is Greater Than Zero
if x is Negative then output : X is Neg
and if we provide x 0 then output will be X is Zero
*/

In above example if we do not provide else part and enter 0 to value of x then Output will be nothing, as none of two conditions are fulfilled.

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