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What is the purpose for leaving decimal values at the end of a number? The may give additional precision or may be indicators of the number of significant digits in the calculation. As an example of the latter, 5.000 kilometres is, at first sig â¦ ht, no different from 5 km.
Generally, strings are terminated with a null character (ASCII code 0). This allows functions (like Serial.print()) to tell where the end of a string is. Otherwise, they would continue reading subsequent bytes of memory that aren't actually part of the string. This means that your string needs to have space for one more character than the text you want it to contain. That is why Str2 and Str5 need to be eight characters, even though arduino is only seven - the last position is automatically filled with a null character.