C语言中浮点数的存储格式及其有效数字位数

Storage Format of A Binary Floating-Point Number and its Bits of Decimal Significant Digits

总结了C语言中的单精度型(float)、双精度型(double)和长双精度型(long double)浮点数的存储格式,并用简洁的C程序给出了验证;对其表示的十进制数的有效数字位数,从相对误差的角度,给出了判定方法及结论。

It describes how floating-point data（float, double, long double） stored in memory, the range and precision of storage formats, and how to validate it in simple C program. It discusses the number of decimal significant digits from the viewpoint of relative error.