As was noted, you don't have to convert them. You could simply use a format when printing them.
Since your original question asked about converting them to character, you would use a PUT function.
newvar = put(oldvar, 8.3);
The width that you choose ("8" in this example) must be wide enough to include all characters that will be needed: digits before the decimal point, digits after, the decimal point itself, and a negative sign if needed.
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