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You do not need to clear your input buffer before reading input again - scanf will overwrite the existing contents with the new input. You should probably lose the memset call completely. The following example uses the Clear method to reset integer values in a one-dimensional, two-dimensional, and three-dimensional array. using System;

How do you clear a stringstream variable? - Stack Overflow

To delete any n characters from the beginning of a string, please see How to remove characters from left in Excel. I am storing characters inside of my string. I plan to log Hexadecimal numbers coming into from the serial read. When the context scope is entered you're guaranteed to have a new instance that's correctly initialized. If you enable method2 as suggested in the comments or other answers, you can see that all 905 bytes are in use by the time we exit. in std::__cxx11::basic_string, std::allocator>::reserve(unsigned long) (/usr/local/lib64/libstdc++.so.6+0x13725c)Assigning to the string in the string buffer (via stringstream::str or stringbuf::str) may lose the buffer already allocated by the string.

std::string::clear in C++ - GeeksforGeeks

All the way more, if you're handling huge arrays (6 digits and above) you should try to set the first value to Null instead of running memset() through the whole String. As you can see in the image below, it deletes all spaces before text, after text and between words/substrings except for a single space character. Although an old question, I thought I would chime in. If I took the time to understand the question properly, I believe you wanted to clear the contents of the String and not the char array. This may help those who wanted to empty a string for other reasons. String randomString(received); Symbols & punctuation marks - removes special symbols and punctuation marks such as a period, question mark, exclamation point, comma, etc.However, if you feel you must zero out the buffer between inputs (and there are valid use cases for doing so, although this isn't one of them), use sizeof choice as the third argument to memset: memset( choice, 0, sizeof choice );