$$\begin{gathered} \mathbf{for}x\mathbf{from}\mathrm{myvariable}\mathbf{to}5\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

Error, initial value in for loop must be numeric or character

$$\begin{gathered} \mathbf{for}x\mathbf{to}5\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

$1$

$2$

$3$

$4$

$5$

$$\begin{gathered} \mathbf{for}x\mathbf{from}\mathrm{myvariable}\mathbf{to}''c''\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

Error, initial value in for loop must be numeric or character

$$\begin{gathered} \mathbf{for}x\mathbf{from}''a''\mathbf{to}''c''\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

$''a''$

$''b''$

$''c''$

$y≔\mathrm{sqrt}\left(20\right)$

$y:=2\sqrt{5}$

$$\begin{gathered} \mathbf{for}x\mathbf{to}y\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

Error, final value in for loop must be numeric or character

$\mathrm{type}\left(y\,\'\mathrm{numeric}\'\right)\;$

$\mathrm{false}$

$\mathrm{type}\left(y\,\'\mathrm{character}\'\right)\;$

$\mathrm{false}$

$$\begin{gathered} \mathbf{for}x\mathbf{to}\sqrt{25}\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

$1$

$2$

$3$

$4$

$5$

$$\begin{gathered} \mathbf{for}x\mathbf{by}\sqrt{2}\mathbf{to}evalf\left(\sqrt{3}\right)\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

Error, increment of for loop must be numeric

$\mathrm{type}\left(\mathrm{sqrt}\left(2\right)\,\'\mathrm{numeric}\'\right)$

$\mathrm{false}$

$\mathrm{type}\left(\mathrm{evalf}\left(\mathrm{sqrt}\left(2\right)\right)\,\'\mathrm{numeric}\'\right)$

$\mathrm{true}$

$$\begin{gathered} \mathbf{for}x\mathbf{by}evalf\left(\sqrt{2}\right)\mathbf{to}evalf\left(\sqrt{3}\right)\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(x\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

$1$

$$\begin{gathered} \mathbf{for}i\mathbf{from}''a''\mathbf{by}\frac{1}{2}\mathbf{to}''e''\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(i\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

Error, increment when looping over characters must be an integer

$$\begin{gathered} \mathbf{for}i\mathbf{from}''a''\mathbf{by}2\mathbf{to}''e''\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(i\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

$''a''$

$''c''$

$''e''$

$$\begin{gathered} \mathbf{for}i\mathbf{to}''g''\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(i\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

Error, final value in for loop must have same type as initial

$$\begin{gathered} \mathbf{for}i\mathbf{to}7\mathbf{while}\mathrm{true}\mathbf{do} \\ print\left(i\right) \\ \mathbf{end}\mathbf{do}\; \end{gathered}$$

$1$

$2$

$3$

$4$

$5$

$6$

$7$