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| <h5 class="subsubsection">7.6.1.2 Printing the Currency Symbol</h5> |
| |
| <p><a name="index-currency-symbols-713"></a> |
| These members of the <code>struct lconv</code> structure specify how to print |
| the symbol to identify a monetary value—the international analog of |
| ‘<samp><span class="samp">$</span></samp>’ for US dollars. |
| |
| <p>Each country has two standard currency symbols. The <dfn>local currency |
| symbol</dfn> is used commonly within the country, while the |
| <dfn>international currency symbol</dfn> is used internationally to refer to |
| that country's currency when it is necessary to indicate the country |
| unambiguously. |
| |
| <p>For example, many countries use the dollar as their monetary unit, and |
| when dealing with international currencies it's important to specify |
| that one is dealing with (say) Canadian dollars instead of U.S. dollars |
| or Australian dollars. But when the context is known to be Canada, |
| there is no need to make this explicit—dollar amounts are implicitly |
| assumed to be in Canadian dollars. |
| |
| <dl> |
| <dt><code>char *currency_symbol</code><dd>The local currency symbol for the selected locale. |
| |
| <p>In the standard ‘<samp><span class="samp">C</span></samp>’ locale, this member has a value of <code>""</code> |
| (the empty string), meaning “unspecified”. The ISO standard doesn't |
| say what to do when you find this value; we recommend you simply print |
| the empty string as you would print any other string pointed to by this |
| variable. |
| |
| <br><dt><code>char *int_curr_symbol</code><dd>The international currency symbol for the selected locale. |
| |
| <p>The value of <code>int_curr_symbol</code> should normally consist of a |
| three-letter abbreviation determined by the international standard |
| <cite>ISO 4217 Codes for the Representation of Currency and Funds</cite>, |
| followed by a one-character separator (often a space). |
| |
| <p>In the standard ‘<samp><span class="samp">C</span></samp>’ locale, this member has a value of <code>""</code> |
| (the empty string), meaning “unspecified”. We recommend you simply print |
| the empty string as you would print any other string pointed to by this |
| variable. |
| |
| <br><dt><code>char p_cs_precedes</code><dt><code>char n_cs_precedes</code><dt><code>char int_p_cs_precedes</code><dt><code>char int_n_cs_precedes</code><dd>These members are <code>1</code> if the <code>currency_symbol</code> or |
| <code>int_curr_symbol</code> strings should precede the value of a monetary |
| amount, or <code>0</code> if the strings should follow the value. The |
| <code>p_cs_precedes</code> and <code>int_p_cs_precedes</code> members apply to |
| positive amounts (or zero), and the <code>n_cs_precedes</code> and |
| <code>int_n_cs_precedes</code> members apply to negative amounts. |
| |
| <p>In the standard ‘<samp><span class="samp">C</span></samp>’ locale, all of these members have a value of |
| <code>CHAR_MAX</code>, meaning “unspecified”. The ISO standard doesn't say |
| what to do when you find this value. We recommend printing the |
| currency symbol before the amount, which is right for most countries. |
| In other words, treat all nonzero values alike in these members. |
| |
| <p>The members with the <code>int_</code> prefix apply to the |
| <code>int_curr_symbol</code> while the other two apply to |
| <code>currency_symbol</code>. |
| |
| <br><dt><code>char p_sep_by_space</code><dt><code>char n_sep_by_space</code><dt><code>char int_p_sep_by_space</code><dt><code>char int_n_sep_by_space</code><dd>These members are <code>1</code> if a space should appear between the |
| <code>currency_symbol</code> or <code>int_curr_symbol</code> strings and the |
| amount, or <code>0</code> if no space should appear. The |
| <code>p_sep_by_space</code> and <code>int_p_sep_by_space</code> members apply to |
| positive amounts (or zero), and the <code>n_sep_by_space</code> and |
| <code>int_n_sep_by_space</code> members apply to negative amounts. |
| |
| <p>In the standard ‘<samp><span class="samp">C</span></samp>’ locale, all of these members have a value of |
| <code>CHAR_MAX</code>, meaning “unspecified”. The ISO standard doesn't say |
| what you should do when you find this value; we suggest you treat it as |
| 1 (print a space). In other words, treat all nonzero values alike in |
| these members. |
| |
| <p>The members with the <code>int_</code> prefix apply to the |
| <code>int_curr_symbol</code> while the other two apply to |
| <code>currency_symbol</code>. There is one specialty with the |
| <code>int_curr_symbol</code>, though. Since all legal values contain a space |
| at the end the string one either printf this space (if the currency |
| symbol must appear in front and must be separated) or one has to avoid |
| printing this character at all (especially when at the end of the |
| string). |
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