### 3.5.6 Flow control

A block is a sequence of commands surrounded by { and }.

    {
       command;
       ...
    }

Blocks are used whenever SINGULAR is used as a structured programming language. The `if` and `else` structures allow conditional execution of blocks (see if, else). `for` and `while` loops are available for a repeated execution of blocks (see for, while). In procedure definitions, the main part and the example section are blocks as well(see proc).

> 5.2.2 break |  |
> 5.2.13 quit |  |
> 5.2.11 keepring |  |
> 5.2.6 export |  |
> 5.2.7 exportto |  |
> 5.2.9 if |  |
> 5.2.10 importfrom |  |
> 5.2.5 else |  |
> 5.2.8 for |  |
> 5.2.15 while |  |
> 4.16 proc |  |
> 5.2.14 return |  |
> 5.2.4 continue |  |

User manual for Singular version 4-0-3, 2016, generated by texi2html.