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Output shows un common characters while changing from infix to postfix notation using C++

The problem is that you process p_newStr without initializint it, and only performing pointer arithmetic on it. I guess, that you wanted to see it as a string, adding chars to it.

So first initialisze it:

    char* p_newStr = newStr; // It was
unitinitalised, pointing at random location

Then note that p_newStr = p_newStr + str[i] means adding the value of the char str[i], converted to int, to the pointer p_newStr. That's pointer arithmetic. Replace this statement with:

    *p_newStr++ = str[i];   // instead
of p_newStr = ... 

and there is another one taking a char from the stack[]:

    *p_newStr++ = stack[top];   //
instead of p_newStr = ... 

Finally, put an ending null terminator to the c string you've built, just before your printf():

    *p_newStr++ = 0;

Once these corrections made, the code produces exactly the expected results.

Categories : C

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