使用 input () 还是 put() 转换变量数据类型取决于 source data type 和 target data type。对于 input() 和 put()，有四条原则：
- PUT() always creates character variables
- INPUT() can create character or numeric variables based on the informat
- The source format must match the source variable type in PUT()
- The source variable type for INPUT() must always be character variable
EXAMPLE :
| Convert Raw to Returned | Function Call | Raw Type | Raw Value | Returned Type | Returned Value |
character variable to another character variable | A PUT(name, $10.); | char, char format | ‘Richard’ | char always | ‘Richard ’ |
| numeric variable to character variable with numeric value | B PUT(age, 4.); | num, num format | 30 | char always | ‘ 30’ |
| character variable to another character variable with a user defined format | C PUT(name, $nickname.); | char, char format | ‘Richard’ | char always | ‘Rick’ |
| character variable with numeric value and informat to a numeric variable | D INPUT(agechar, 4.); | char always | ‘30’ | num, num informat | 30 |
| character variable with numeric value and informat to a character variable | E INPUT(agechar, $4.); | char always | ‘30’ | char, char informat | ‘ 30’ |
| character variable with numeric value and informat to a numeric variable | F INPUT(cost,comma7.); | char always | ‘100,541’ | num, num informat | 100541 |
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