Why campiler give error

Question

https://code.sololearn.com/cao0k6bxZcr4/?ref=app

Answer 1

Arash , there are 2 warnings when running the code:

int a;
char b;
int c;
double d = c*a/100; // <-------
cin>>a>>b>>c;

both are from the line which is marked. You are using 2 variables "a" and "c" that are both NOT initialized with a value, since cin is used in the next line. This can cause problems. swap this 2 lines to run the code.

Answer 2

everything works fine, you just have to give input like this:
2
*
4
instead of
2*4

Answer 3

If you input an unrecognised operator, the code output will be 'error'.

Answer 4

It's not error but a warning. You have defined variable `d` but haven't used it anywhere in code.

Either remove line 8 or comment it down like this:
//double d;

Answer 5

Arash

Remove this line:
double d = c*a/100;
Change this line:
cout<<a<<"%"<<c<<"="<<d;
To:
cout<<a<<"%"<<c<<"="a%c;

Finish the C++ lesson and use google or bing or read the C++ documentation.

Answer 6

Arash , again.. a warning not an error. You are using variables in an expression before assigning a value to them. First take input for variables and then calculate.

Answer 7

Just remove line 8 and give input 2*3

Answer 8

I used it in my code but its show error again

Answer 9

I changed my code and now my problem is double again its not work like decimal number