I have a question about my project...

**merc824** · 05-28-2020

Can someone please review my .c file and answer my question on line 24, 25.

Thank you in advance and have a nice day!!!

Here's a copy of my file in case it wasn't attached:

Code:

//This is just a rough draft of a project I am working on, so I apologize for the sloppy work..
#include <stdio.h>
#include <stdlib.h>


int main (){




float a,b,c,d,e,y,w;
float f=3.79;
b=100;
e=64;
d= f/e;


while (a<10){




    printf("Enter your number: \n");
    scanf("%f",&c);


    w=.059219*c;
    y=d+=w;
    if(y>10){
    printf("You did it!!!!\n");
y=y-10;//Why is the value of "y" not being subtracted from this statement?
//When I run it, the value keeps adding from "d+=w" past the if statement.
}


}
return 0;
}

**christop** · 05-28-2020

This may or may not be related to your problem, but what is the value of "a" at this line: while (a<10){? Hint: you don't know.

**merc824** · 05-28-2020

It didn't have a value. I gave it "0" but still no go...

**Sir Galahad** · 05-28-2020

Originally Posted by merc824

y=y-10;//Why is the value of "y" not being subtracted from this statement?

Because you're effectively erasing its current value here:

Code:

 y=d+=w;

**merc824** · 05-29-2020

Thank for the feedback, could you please explain why it's erasing it's value? I thought that += was adding both variables.

**Malcolm McLean** · 05-29-2020

Originally Posted by merc824

Thank for the feedback, could you please explain why it's erasing it's value? I thought that += was adding both variables.

You've written

Code:

y = d += w;

This doesn't make sense, and shouldn't be allowed in C, but in fact it is allowed due to historical hangovers. Break out the expression on to two lines, and then it becomes obvious what you intend.

**john.c** · 05-29-2020

Originally Posted by Malcolm McLean

This doesn't make sense, and shouldn't be allowed in C

You don't know what you're talking about.
It makes perfect sense.
Of course it should be "allowed".

**TheGreekMan2000** · 05-30-2020

First of all, don't attack the other users. It doesn't help you in the longrun. The only think that happens with that is anger.

Secondly, it's not allowed in C. Where did you find it? C isn't your maths teacher.

And lastly, who are you to judge what should be allowed in C and what not?

**laserlight** · 05-30-2020

Originally Posted by TheGreekMan2000

Secondly, it's not allowed in C. Where did you find it? C isn't your maths teacher.

It is legal C syntax. That's the one thing both Malcolm McLean and john.c agree on, and they are right.

Originally Posted by TheGreekMan2000

And lastly, who are you to judge what should be allowed in C and what not?

In matters of "should or should not be allowed", programmers are entitled to their own opinions, and you'll find that we can very opinionated. That's partly why new programming languages are born!

In matters of "what is or is not allowed", you would refer to the C standard, and then to other standards and compiler documentation where applicable.

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