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## 1Description

read_rec reads text from the Input channel associated with unit_number into rec.
IOManagerBase::read_rec returns the number of characters actually read from the Input channel

## 2Specification

1: $\mathbf{unit_number}$ types::f77_integer Scalar
2: $\mathbf{rec}$ std::string Scalar
3: $\mathbf{nchar}$ types::f77_integer Scalar
On entry: number of characters to read from unit_number. If ${\mathbf{read_rec}}<0$ then text should be read until either EOL or EOF has been reached.
Default: $-1$