Troubleshooting C++ Program: Invalid Conversion Error

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In summary, the conversation discusses a programming issue involving the use of single quotes versus double quotes in C++ when assigning a value to a char variable. The error message indicates that the program is trying to convert a string to a single character, which can be fixed by using single quotes instead. The conversation also provides a solution to the issue.
  • #1
Zurtex
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Just been introduced to the world of C++ as I'm taking a course on it in my maths degree. We are asked to write a simple program that takes in 3 numbers, sorts them in terms of order and then outputs them.

Not going to type my full program as that would probably be a waste of your time but here are the two important lines I am stuck on:

char qualifier1;
...
qualifier1 = "=";

And I'm getting the error when I try to compile this:

invalid conversion from `const char*' to `char'

Can anyone help me please, I'm not sure what this means and I am struggling to fix it.
 
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  • #2
i believe the correct syntax for a single char is ' ' not " "...if i remember correctly " " denotes strings...and thus your error is saying
cannot convert const char* "=" (string) to a char (single char qualifier)
 
  • #3
Using double quotes ("") in C and C++ returns a constant character pointer which points to a null-terminated string in the static section of memory. So if you write char* ptr = "dog"; you get ptr pointing to a character array consisting of 'd', 'o', 'g', and '\0', the null terminator.

What you're looking to do is use single quotes. When you type "=", you get the C-string "=". What you want to do is '=', with single quotes. This returns a plain character.

Edit: whoops too late
 
  • #4
neurocomp2003 said:
i believe the correct syntax for a single char is ' ' not " "...if i remember correctly " " denotes strings...and thus your error is saying
cannot convert const char* "=" (string) to a char (single char qualifier)
Thanks :biggrin:
 

FAQ: Troubleshooting C++ Program: Invalid Conversion Error

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