Reading Past the End of a Line
By default, if the INPUT statement tries to read past the end of the current input data record, then it moves the input pointer to column 1 of the next record to read the remaining values. This default behavior is specified by the FLOWOVER option. A message is written to the SAS log:
NOTE: SAS went to a new line when INPUT
statement reached past the end of a line.
Several options are available to change the INPUT statement behavior when an end of line is reached. The STOPOVER option treats this condition as an error and stops building the data set. The MISSOVERand TRUNCOVER options do not allow the input pointer to go to the next record when the current INPUT statement is not satisfied. The SCANOVER option, used with @'character-string' scans the input record until it finds the specified character-string. The FLOWOVER option restores the default behavior.
The TRUNCOVER and MISSOVER options are similar. The MISSOVER option causes the INPUT statement to set a value to missing if the statement is unable to read an entire field because the value is shorter than the field length that is specified in the INPUT statement. The TRUNCOVER option writes whatever characters are read to the appropriate variable.
For example, an external file with variable-length records contains these records:
----+----1----+----2
1
22
333
4444
55555
The following DATA step reads this data to create a SAS data set. Only one of the input records is as long as the informatted length of the variable TESTNUM.
data numbers;
   infile 'external-file';
   input testnum 5.;
run;
This DATA step creates the three observations from the five input records because by default the FLOWOVER option is used to read the input records.
If you use the MISSOVER option in the INFILE statement, then the DATA step creates five observations. All the values that were read from records that were too short are set to missing. Use the TRUNCOVER option in the INFILE statement if you prefer to see what values were present in records that were too short to satisfy the current INPUT statement.
infile 'external-file' truncover;
The DATA step now reads the same input records and creates five observations.

DriftKingHan 发表于 2016-10-30 16:35
可以在informat 5. 前加个冒号，这样就解决了当然还可以用truncover

DriftKingHan 发表于 2016-10-30 16:35
可以在informat 5. 前加个冒号，这样就解决了当然还可以用truncover