我想从文本文件中读取双精度值
例如
31 39.9316476397222 116.113516352222
我两种都试过了,没用。我只能读取前几位十进制数字,例如39.93164 但不是 39.9316476397222
有人知道为什么吗?谢谢!
int NodeID;
double _lat,_long;
fscanf (pFile, "%d %lf %lf", &NodeID,&_lat,&_long);
printf ("I have read: %d %f %f\n", NodeID,_lat,_long);
fscanf (pFile, "%d %lf %lf", &NodeID,&_lat,&_long);
printf ("I have read: %d %lf %lf\n", NodeID,_lat,_long);
根据fscanf 手册页,你应该使用%lf
对于双:
f, e, g (Floating point number) : A series of decimal digits, optionally containing a decimal point, optionally preceeded by a sign (+ or -) and optionally followed by the e or E character and a decimal integer (or some of the other sequences supported by strtod).
Implementations complying with C99 also support hexadecimal floating-point format when preceded by 0x or 0X.
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