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August 29, 2015 14:06
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Round off the decimal value in GNU bc
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| #! /usr/bin/bc | |
| # UUID: 3bf231de-04dc-4c02-92f4-20b891a6f50d | |
| # based on: http://gauc.no-ip.org/awk-users-jp/blis.cgi/DoukakuAWK_294 | |
| define decimal_round(num, decimal_pos) { | |
| if ( decimal_pos <= 0 ) halt | |
| decimal_pos = decimal_pos - 1 | |
| scale = decimal_pos | |
| if (num >= 0) { | |
| num = (num * 10 ^ decimal_pos + 0.5) / (10 ^ decimal_pos) | |
| } else { | |
| num = (num * 10 ^ decimal_pos - 0.5) / (10 ^ decimal_pos) | |
| } | |
| return num | |
| } | |
| # e.g. | |
| print decimal_round(0.8955, 2), "\n" # .9 | |
| print decimal_round(0.8955, 4), "\n" # .896 | |
| print decimal_round(-0.8955, 3), "\n" # -.90 | |
| print decimal_round(-0.8955, 1), "\n" # -1 | |
| quit |
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