C Programming - Control Instructions - Discussion

Thanks to panchan Raut

Thank you Kiran.

6 < = 5 is false, then why = 0, and x increments to 1 i.e., x = 7,

In this you are saying that when it false it will take y=0 but already the why is initialized with 1 how it will take ?

The For statement is something like this

For(i=0 ; i<10 : printf("\n"))
{
....
}


Which is Equivalent to


i=0;
while(1)
{
if(i<10)
{
blah blah blah
}
Else break;

printf("\n");
}

y=x++<=5; is the statement, when x evaluates to b 2 why x value is not assigned to y ? why y is still 1?

@Yash.

Execution of loop takes this form.

Step 1 : Initialization.

Step 2 : Condition checking.

Step 3 : Execute body of loop.

Step 4 : Increment.

If 6<=5 the condition will become false then how it will print last one i.e. 7 0.

I will explain this in easy manner.

We have [y=(x++<=5)] if u observe carefully it consists of
2 valuable expression with in this.

Simple funda is: T T T(1)
F F F(0)

If x<=5 is (true) then expression (x++<=5) is always (true) , that means it have the value 1 , and y will be true
always(1).

If x>=5 is (false) then expression (x++>=5) is always (false) ,that means it have the value 0 , and y will be false always(0).

That is why last step will be [7 0].

The above program can be write like this in while loop:

while(y)
{
y=x++<=5;
pf("%d %d"x,y);
}

But why the "y" value did not change? In y=x++<=5; after the first incrementation y=2++<=5. Why shouldn't the incremented value of x=2 is assigned in "y"? can anyone explain?

Because here y takes the value true or false if true than it get prints 1 otherwise 0 you can change the value of y in the program and check that value of y doesn't matter it will only work on true or false of x++<=5 condition it will print 1 until this condition becomes true and value of x is incremented in every step after the use of x and the incremented value is stored at the position of previous value of x and that's why it take the value from that address and prints the value but it doesn't take value of y from that position because it only takes the answer of true false condition.

Why is the value of x not assigned in y?
coz, y=x++<=5.......????
what should have been the syntax to assign the value of x to y??