The output has extra % sign in C++

Question

int n,t;
cin>>n>>t;
char arr[n];
for(int i=0;i<n;i++){
    cin>>arr[i];
}
// for(int i=0;i<n;i++){
//     cout<<arr[i];
// }
while(t>0){
    for(int i=0;i<n-1;i++){
        if((arr[i]=='B')&&(arr[i+1]=='G')){
            char temp = arr[i];
            arr[i] = arr[i+1];
            arr[i+1] = arr[i];
            i++;
        }
    }
    --t;
}
for(int i=0;i<n;i++){
    cout<<arr[i]<<" ";
}

I am getting one extra % sign while printing the output Like if input is BGGBG output is appearing as GGBGB%

I tried to setup dubugger in code OSS but it never works. I use Arch Linux . — Dexter, May 21 '20 at 15:02
@Dexter without debugging you will get nowhere. Install a proper IDE to a proper OS. — Michael Chourdakis, May 21 '20 at 15:07
Not related to your issue, but note that variable length arrays, i.e. `int n; cin >> n; char a[n];` is *not* standard c++. Prefer `vector` instead. — cigien, May 21 '20 at 15:08
Variable length arrays [are not valid C++](https://stackoverflow.com/q/1887097/6865932), use `std::vector`, or in this case, more appropriately `std::string`. — anastaciu, May 21 '20 at 15:09
gdb doesn't work so I will try to find alternative debuggers. — Dexter, May 21 '20 at 15:16
@Dexter `gdb` is a fine debugger and works well. Either your system is broken or you are using it wrong. — Jesper Juhl, May 21 '20 at 15:26
I get this error Unable to open 'basic_file.cc': Unable to read file '/build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/src/c++98/basic_file.cc' (Error: Unable to resolve non-existing file '/build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/src/c++98/basic_file.cc') — Dexter, May 21 '20 at 15:33

score 2 · Accepted Answer · answered May 21 '20 at 15:06

2

The extra "%" is not something printed by your program. It is just something that your shell added to tell you that there is no newline character after the text.

In order to easily check this you can redirect your program output to a file. You will see that the "%" character will not be in the file.

Alternatively, if you print a newline at the end of your program you will not see the "%" character in your shell.

answered May 21 '20 at 15:06

darcamo

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Thanks! Yesterday I changed my shell that's why it is happening. – Dexter May 21 '20 at 15:09
I'm glad to help. If it fully answers your question you should accept the answer. – darcamo May 21 '20 at 15:12

The output has extra % sign in C++

1 Answers1