如题所述
ä¸ãæ°å¦å ¬å¼ï¼
åé¢ç§¯å ¬å¼ï¼ S=Ïr²
åå¨é¿å ¬å¼ï¼ C=2Ïr
äºãç®æ³è®¾è®¡ï¼
1ãè¾å ¥åå¾rå¼ï¼
2ãæ ¹æ®æ°å¦å ¬å¼ï¼åå«è®¡ç®é¢ç§¯åå¨é¿ï¼
3ãè¾åºç»æã
ä¸ãåè代ç ï¼
#include <stdio.h>#define PI 3.1415927
int main()
{
double r,c,s;
scanf("%lf",&r);//è¾å ¥åå¾ã
c=2*PI*r;//计ç®å¨é¿.
s=PI*r*r;//计ç®é¢ç§¯.
printf("S=%lf, C=%lf\n", s, c);//è¾åºç»æã
return 0;
}
注æäºé¡¹ï¼
1ãé¢ç®ä¸æªéå®åå¾ç±»åï¼æ以ç¨double è¿è¡åå¨ï¼
2ãPIå¼ä¸ºå®å®ä¹ï¼å ·ä½å¼æ ¹æ®ç²¾åº¦è¦æ±ï¼è®¾ç½®PIå¼ã
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