For loop yields no result(must see)

[suryap.kv1bbsr]

Friends,

I need your help in this code:

#include<stdio.h>
void main()
{
    int a,b;
    for(a=1,b=5;a==b;a++,b--)
     printf("%d",a);
}

the turbo c++ 1.01 compiler doesn't show any error, but it shows nothing in the output.Only a space.

important: i have tired in visual c and borland also, but the same thing.Moreover, i need to print the value of variable a only when the value of a equals value of b.

[Subsonics]

Change:

a==b

to:

a < b

And it should work. What you are saying is essentially while this is true, do that, where this is your condition and that is the body of the loop. The problem is that from the first iteration of the loop the condition is false, that's why it wont run.

Also, you should have int main, and return 0.

[vart]

there are some free compilers that are not so ancient as turbo C...

Look at Visual C Express for example

[suryap.kv1bbsr]

Change:

a==b

to:

a < b

And it should work. What you are saying is essentially while this is true, do that, where this is your condition and that is the body of the loop. The problem is that from the first iteration of the loop the condition is false, that's why it wont run.

Also, you should have int main, and return 0.

sorry,
i need to print the value of variable a only when the value of a equals value of b.

pls help me

[suryap.kv1bbsr]

there are some free compilers that are not so ancient as turbo C...

Look at Visual C Express for example

i have used borland and visual c as well

[Subsonics]

sorry,
i need to print the value of variable a only when the value of a equals value of b.

pls help me

Then I recommend that you print both a and b, in each iteration then you will see what is going on and also be able to figure out when and where that will happen.

[suryap.kv1bbsr]

Then I recommend that you print both a and b, in each iteration then you will see what is going on and also be able to figure out when and where that will happen.

i have done that too

#include<stdio.h>
void main()
{
    int a,b;
    for(a=1,b=5;a==b;a++,b--)
     printf("%d %d",a,b);
}

but the output is blank

[Subsonics]

Like I said, you have to change == to < or it wont work. The first thing that gets checked is that condition. ie. is a == b, the answer is no, a is 1 and b is 5 so the loop never runs.

[vart]

i need to print the value of variable a only when the value of a equals value of b.

if this is only thing you need - you do not need a loop

int b = 5;

int a = b;

printf (" a = %d \n", a);

so you better explain what you are REALLY trying to do.

[magestrium]

when u write a==b in for the compiler checks for 1==5 which is not true hence the program terminates and no output just blank space.

[suryap.kv1bbsr]

if this is only thing you need - you do not need a loop

int b = 5;

int a = b;

printf (" a = %d \n", a);

so you better explain what you are REALLY trying to do.

i know that there are other ways of writing the program but i want to accomplish the following by a for loop:
[logic]
two variables a and b have values 1 and 5 respectively.
both are incremented and decremented the same time.
the computer first checks whether 1==5, since it fails, the loop is run again
this time it checks whether 2==4,since it fails, the loop is run again
this time it checks whether 3==3,since it succeeds, the values of a and b are printed
[/logic]

[suryap.kv1bbsr]

when u write a==b in for the compiler checks for 1==5 which is not true hence the program terminates and no output just blank space.

i want to accomplish the following by a for loop:
[logic]
two variables a and b have values 1 and 5 respectively.
both are incremented and decremented the same time.
the computer first checks whether 1==5, since it fails, the loop is run again
this time it checks whether 2==4,since it fails, the loop is run again
this time it checks whether 3==3,since it succeeds, the values of a and b are printed
[/logic]

[laserlight]

It would be easier to just compute the arithmetic mean. Furthermore, what happens if one number is even and the other number is odd?

[vart]

i know that there are other ways of writing the program but i want to accomplish the following by a for loop:
[logic]
two variables a and b have values 1 and 5 respectively.
both are incremented and decremented the same time.
the computer first checks whether 1==5, since it fails, the loop is run again
this time it checks whether 2==4,since it fails, the loop is run again
this time it checks whether 3==3,since it succeeds, the values of a and b are printed
[/logic]

it means you want you loop run while a != b...


and print the value of a when loop exits...

[suryap.kv1bbsr]

it means you want you loop run while a != b...


and print the value of a when loop exits...

thankyou very much you are great!!!!!!!!!!