蟺锛圥i锛夋槸涓€涓湪鏁板銆佺墿鐞嗐€佸伐绋嬬瓑棰嗗煙鍏锋湁閲嶈鎰忎箟鐨勫父鏁般€傚畠浠ｈ〃鐫€鍦嗙殑鍛ㄩ暱涓庣洿寰勭殑姣斾緥锛屾槸涓€涓棤鐞嗘暟锛屽叾鍊肩害涓?.14159銆傚湪C璇█涓紝涓轰簡鏂逛究绋嬪簭鍛樺湪缂栫▼杩囩▼涓紩鐢ㄏ€锛屽紩鍏ヤ簡涓€涓悕涓衡€減i鈥濈殑瀹忓畾涔夈€傛湰鏂囧皢鍥寸粫蟺瀹忓睍寮€锛屾帰璁ㄥ叾鑳屽悗鐨勬暟瀛﹀ゥ绉樹互鍙婂湪瀹為檯缂栫▼涓殑搴旂敤銆?/p>
涓€銆佅€瀹忕殑璧锋簮涓庡畾涔?/p>
蟺瀹忚捣婧愪簬C璇█鏍囧噯搴撱€傚湪C璇█涓紝涓轰簡鏂逛究绋嬪簭鍛樺湪缂栫▼杩囩▼涓紩鐢ㄏ€锛屽皢蟺鐨勫€煎畾涔変负涓€涓畯銆傛牴鎹瓹璇█鏍囧噯锛屜€瀹忕殑瀹氫箟濡備笅锛?/p>
```c
define pi 3.14159265358979323846
```
杩欎釜瀹忓畾涔夊湪缂栬瘧杩囩▼涓紝浼氬皢绋嬪簭涓墍鏈夌殑鈥減i鈥濇浛鎹负3.14159265358979323846銆傝繖鏍凤紝绋嬪簭鍛樺湪缂栧啓绋嬪簭鏃讹紝鍙渶鍦ㄩ渶瑕佷娇鐢ㄏ€鐨勫湴鏂癸紝鐩存帴寮曠敤鈥減i鈥濆畯鍗冲彲銆?/p>
浜屻€佅€瀹忓湪鏁板棰嗗煙鐨勫簲鐢?/p>
蟺鏄竴涓棤鐞嗘暟锛屽叾鍊兼棤娉曠敤鏈夐檺鐨勫皬鏁版垨鍒嗘暟琛ㄧず銆傁€鐨勭簿纭€煎浜庢暟瀛︾爺绌跺叿鏈夐噸瑕佹剰涔夈€備互涓嬫槸涓€浜浵€鍦ㄦ暟瀛﹂鍩熺殑搴旂敤瀹炰緥锛?/p>
1. 鍦嗙殑鍛ㄩ暱涓庨潰绉绠楋細蟺鏄绠楀渾鍛ㄩ暱鍜岄潰绉殑鍏抽敭甯告暟銆備緥濡傦紝涓€涓崐寰勪负r鐨勫渾锛屽叾鍛ㄩ暱C鍜岄潰绉疉鍒嗗埆鍙互鐢ㄤ互涓嬪叕寮忚〃绀猴細
C = 2 pi r
A = pi r r
2. 寮у害鍒朵笌瑙掑害鍒惰浆鎹細鍦ㄦ暟瀛﹀拰鐗╃悊棰嗗煙锛屽姬搴﹀埗鏄竴绉嶅父鐢ㄧ殑瑙掑害搴﹂噺鍗曚綅銆傁€鍦ㄥ姬搴﹀埗涓崰鏈夌壒娈婂湴浣嶏紝鍥犱负涓€涓畬鏁村渾鐨勫姬搴︿负2蟺銆傚洜姝わ紝鍦ㄨ繘琛岃搴﹀埗涓庡姬搴﹀埗涔嬮棿鐨勮浆鎹㈡椂锛屜€璧风潃閲嶈浣滅敤銆?/p>
涓夈€佅€瀹忓湪C璇█缂栫▼涓殑搴旂敤
鍦–璇█缂栫▼涓紝蟺瀹忚骞挎硾搴旂敤浜庡悇绫荤畻娉曞拰鏁板璁＄畻銆備互涓嬫槸涓€浜浵€瀹忓湪C璇█缂栫▼涓殑搴旂敤瀹炰緥锛?/p>
1. 璁＄畻鍦嗗懆鐜囷細閫氳繃杩唬绠楁硶锛屽彲浠ヨ绠楀嚭蟺鐨勮繎浼煎€笺€備互涓嬫槸涓€涓娇鐢ㄏ€瀹忚绠椣€杩戜技鍊肩殑C璇█绋嬪簭绀轰緥锛?/p>
```c
include
define pi 3.14159265358979323846
int main() {
double n = 1000000; // 杩唬娆℃暟
double term = 1.0 / n;
double sum = 0.0;
for (int i = 0; i < n; i++) {
sum += term;
term /= 2.0;
}
double pi_approx = 4.0 sum;
printf(\