any digit of a number that is known with certainty; any digit of a number beginning with the leftmost non-zero digit and ending with the rightmost non-zero digit (or a zero considered to be the exact value);
"he calculated the answer to four significant figures"
例句
用作名词 (n.)
Rules for determining significant figures in reading are given below. 有效数字的读取规则。
The number of significant digits displayed in floating point numbers. 浮点数中显示有效数字的位数。
美
