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Ratio

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ÇÁ·Î±×·¡¹ÖÀ» ÇÏ´Ù°¡ º¸¸é ƯÁ¤ scale ¹üÀ§ÀÇ °ªÀ» ÁöÁ¤ÇÑ scale ¹üÀ§¸¦ °®´Â °ªÀ¸·Î º¯È¯ÇÏ¿© »ç¿ëÇØ¾ß ÇÏ´Â °æ¿ì°¡ Á¾Á¾ ¹ß»ýÇÕ´Ï´Ù. Åë»óÀûÀ¸·Î ºñÀ²Àº ´ÙÀ½°ú °°ÀÌ Ç¥½ÃÇÕ´Ï´Ù.
x1 : x2 = y1 : y2


±×¸®°í ÀÌ°ÍÀº ´ÙÀ½°ú µ¿ÀÏÇÑ µî°¡½ÄÀÔ´Ï´Ù. (»ç½Ç»ó ÀÌ µî°¡½Ä¸¸ ¾Ë¸é ¸ðµç°ÍÀº ³¡³µ½À´Ï´Ù. À̰͸¸À¸·Î ¾î¶°ÇÑ ºñÀ²ÀÌ¶óµµ ±¸ÇÒ¼ö ÀÖ°Ô µË´Ï´Ù.)
x1 * y2 = x2 * y1


À̸¦ È°¿ëÇÏ¿© ¹éºÐÀ²Àº ´ÙÀ½°ú °°ÀÌ Á¤ÀÇµÇ¾î °è»êµÉ¼ö ÀÖ½À´Ï´Ù.
x : 100 = value : max
x * value = 100 * max
x = ( 100 * value ) / max


¿©±â¼­ ¿¹¸¦ µé¸é ÃÑ 500°³ÀÇ »ç°ú°¡ ÀÖ´Ù°í ÇßÀ»¶§ ÀÌÁß¿¡ 20% ´Â ¸î°³ÀÇ »ç°ú¸¦ ¸»ÇÒ±î¿ä?
20 : 100 = x : 500
20 * 500 = 100 * x
x = ( 20 * 500 ) / 100 = 10000 / 100 = 100


Áï, 500°³ Áß¿¡¼­ 20%´Â 100°³°¡ µË´Ï´Ù. ÇÁ·Î±×·¡¹Ö¿¡¼­ÀÇ ¹éºÐÀ² Ç¥½Ã´Â ÀÌ·¸°Ôµµ ±¸ÇöÇÒ¼ö ÀÖÀ»°Ì´Ï´Ù.
void print_percent(long s_value, long s_max)
{
long long s_man;

s_man = (((long long)s_value) * 10000ull) / s_max;

(void)fprintf(stdout, "%llu.%02llu%%\n", s_man / 100ull, s_man % 100ull);
}


À§ÀÇ ¿¹Á¦¼Ò½º´Â ¼Ò¼öÁ¡ÀÌÇÏ 2ÀÚ¸®±îÁö¸¸ Ç¥½ÃÇÏ°í ¼Ò¼öÁ¡ °è»êÀ» ȸÇÇÇÏ°í Á¤¼ö°è»ê¸¸À¸·Î ¼Ò¼öÁ¡ÀÌÇÏ 2ÀÚ¸®¸¦ Ç¥½ÃÇϱâ À§Çؼ­ ¹éºÐÀ²À» ¸¸ºÐÀ²·Î °è»êÇÏ¿© Á¤ºÎºÎºÐ°ú ¼Ò¼öÁ¡ºÎºÐÀ» 100 À̶ó´Â ¹èÀ²°ªÀ¸·Î ³ª´©¾îÁö°Ô ±¸ÇöÇÑ °ÍÀÔ´Ï´Ù.

ÀÌ ¹Û¿¡µµ ºñÀ²°ø½ÄÀº ³Ê¹« ±¤¹üÀ§ÇÏ°Ô »ç¿ëµÇ¹Ç·Î ²À ¸Ó¸®¼Ó¿¡ »õ°Ü³Ö¾î¾ß ÇÏ´Â °ø½ÄÁß¿¡ ÇÑ°¡Áö¶ó°í ÁÖÀåÇÕ´Ï´Ù.

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