c语言怎样精确到小数点后8位. C语言输入小数,精确到小数点后10位
c\u8bed\u8a00\u4e2d\u5982\u4f55\u5224\u65ad\u8ba1\u7b97\u7ed3\u679c\u7cbe\u786e\u5230\u5c0f\u6570\u70b9\u540e8\u4f4dint multiply(int i)
{
if (i ==1 || i == 0) return 1;
else return (i*multiply(i-1));
}
int _tmain(int argc, _TCHAR* argv[])
{
int i=1,j=1;
double x;
scanf("%lf",&x);
double result=1;
while (1)
{
j = j*(-1);
int sum = multiply(i);
double k;
k=pow(x,2*i)/sum;
result =result+j*pow(x,2*i)/(double)sum;
if (k<=0.00000001)
{printf("result = %.8f ; i = %d",result, i);
break;}
i++;
}
system("pause");
return 0;
}
\u628ascanf("%15.10f",&x);\u5e94\u8be5\u6539\u6210scanf("%15lf",&x);\u8fd9\u6837\u5c31\u597d\u4e86\u3002
\u4ee3\u7801\u4e2dx\u662fdouble\u578b\u7684\uff0c\u5728\u8f93\u5165\u6570\u636e\u7684\u65f6\u5019\u662f\u4e0d\u5141\u8bb8\u4f7f\u7528%f\u7684\uff0cdouble\u578b\u7684\u6570\u636e\u8f93\u5165\u5fc5\u987b\u4f7f\u7528%lf
\u8fd8\u6709\uff0cscanf("%15.10f",&x);15.10\u8fd9\u4e2a\u662f\u4e0d\u5141\u8bb8\u51fa\u73b0\u7684\uff0c\u5728\u6570\u636e\u8f93\u5165\u7684\u65f6\u5019\u53ea\u80fd\u6307\u5b9a\u8f93\u5165\u6570\u636e\u7684\u603b\u957f\u5ea6\uff0c\u4e0d\u80fd\u6307\u5b9a\u5c0f\u6570\u70b9\u540e\u7684\u957f\u5ea6\u3002
\u6269\u5c55\u8d44\u6599\uff1a
scanf(\u51fd\u6570\u539f\u578b
int scanf(const char * restrict format,...);
\u51fd\u6570 scanf() \u662f\u4ece\u6807\u51c6\u8f93\u5165\u6d41stdin(\u6807\u51c6\u8f93\u5165\u8bbe\u5907\uff0c\u4e00\u822c\u6307\u5411\u952e\u76d8)\u4e2d\u8bfb\u5185\u5bb9\u7684\u901a\u7528\u5b50\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u8bf4\u660e\u7684\u683c\u5f0f\u8bfb\u5165\u591a\u4e2a\u5b57\u7b26\uff0c\u5e76\u4fdd\u5b58\u5728\u5bf9\u5e94\u5730\u5740\u7684\u53d8\u91cf\u4e2d\u3002
\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u683c\u5f0f\u5b57\u7b26\u4e32\uff0c\u5b83\u6307\u5b9a\u4e86\u8f93\u5165\u7684\u683c\u5f0f\uff0c\u5e76\u6309\u7167\u683c\u5f0f\u8bf4\u660e\u7b26\u89e3\u6790\u8f93\u5165\u5bf9\u5e94\u4f4d\u7f6e\u7684\u4fe1\u606f\u5e76\u5b58\u50a8\u4e8e\u53ef\u53d8\u53c2\u6570\u5217\u8868\u4e2d\u5bf9\u5e94\u7684\u6307\u9488\u6240\u6307\u4f4d\u7f6e\u3002\u6bcf\u4e00\u4e2a\u6307\u9488\u8981\u6c42\u975e\u7a7a\uff0c\u5e76\u4e14\u4e0e\u5b57\u7b26\u4e32\u4e2d\u7684\u683c\u5f0f\u7b26\u4e00\u4e00\u987a\u6b21\u5bf9\u5e94\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-scanf \uff08\u8ba1\u7b97\u673a\u8bed\u8a00\u51fd\u6570\uff09
这么改t=(double)s/i;，先把除数变为double
绛旓細s 鍜宨鏄痠nt绫诲瀷鐨勶紝3/2 鏄=1鐨勶紝濡傛灉鏄痜loat 鎴栬卍ouble 3.0/2.0=1.5鐨
绛旓細{printf("result = %.8f ; i = %d",result, i);break;} i++;} system("pause");return 0;}
绛旓細if ( (c=getchar())=='\n') break;} printf("%.8f\n",s/n);return 0;} 杈撳叆鏁版嵁鐢ㄧ┖鏍煎垎闅旓紝鏈鍚庝竴涓暟鍚庨潰鏄崲琛岀'\n'锛堝鏋滀綘鐢 鍥炶溅绗 '\r' , 鍒欐敼涓 if ( (c=getchar())=='\r') break; ).
绛旓細鍦–璇█涓紝%10.8f鍜%.8f鏄敤浜庢牸寮忓寲杈撳嚭娴偣鏁扮殑鏂瑰紡锛瀹冧滑鐨勫叿浣撳惈涔夊涓嬶細10.8f锛氳〃绀鸿緭鍑轰竴涓诞鐐规暟锛屾诲搴︿负10锛屽皬鏁扮偣鍚庝繚鐣8浣锛屽鏋滃皬鏁扮偣鍚庣殑浣嶆暟涓嶈冻8浣嶏紝鍒欏湪鍚庨潰鐢0琛ラ綈銆.8f锛氳〃绀鸿緭鍑轰竴涓诞鐐规暟锛屽皬鏁扮偣鍚庝繚鐣8浣嶏紝鎬诲搴︿笉瀹氾紝鏍规嵁瀹為檯鏁板肩殑澶у皬鏉ヨ嚜閫傚簲璋冩暣瀹藉害銆傚洜姝わ紝涓...
绛旓細// 鍔犱簡fixed鎰忓懗鐫鏄浐瀹氱偣鏂瑰紡鏄剧ず锛屾墍浠ヨ繖閲岀殑绮惧害鎸囩殑鏄灏忔暟浣锛岃緭鍑轰负12.3457cout << value << endl; // fixed鍜宻etprecision鐨勪綔鐢ㄨ繕鍦紝渚濈劧鏄剧ず12.3457cout.unsetf( ios::fixed ); // 鍘绘帀浜唂ixed锛屾墍浠ョ簿搴︽仮澶嶆垚鏁翠釜鏁板肩殑鏈夋晥浣嶆暟锛屾樉绀轰负12.35cout << value << endl;cout.precision...
绛旓細include<stdio.h>int main(){int i,a[50],s,b;double t;/*灏忔暟鐐8浣 鍗曠簿搴︽渶澶氱簿纭埌6鍒7浣 瑕绮剧‘鍒8浣 瑕佺敤鍙岀簿搴*/s = 0;/*鍙岀瓑鍙==鏄昏緫杩愮畻绗 = 鎵嶆槸璧嬪艰繍绠楃*/for(b=0;b<50;b++) { scanf("%d",&a[b]);/*寰幆杈撳叆*/ if(a[b] == -1)/*...
绛旓細浣跨敤杈撳嚭鏍煎紡璇存槑绗︽潵鎸囧畾绮剧‘鍒板皬鏁扮偣浣嶆暟銆傚锛歷oid main(){ float a=345.234678锛沺rintf("%.3f\n", a) ;} 鍏朵腑%.3f閲岀殑3灏辫〃绀鸿緭鍑绮剧‘鍒板皬鏁扮偣鍚3浣嶃傛墍浠ュ彲鍙傝冪殑褰㈠紡鏄痯rintf("%m.nf",p)锛沵.nf,鎸囧畾杈撳嚭鐨勬暟鎹叡鍗爉鍒楋紝鍏朵腑鏈塶浣嶆槸灏忔暟銆傚鏋滄暟鍊奸暱搴﹀皬浜巑锛屽垯宸︾琛ョ┖鏍硷紝鑻ユ暟鍊...
绛旓細搴旇鏄0.8f%鈥濊繖鏍风殑鍚э紝杩欐槸C璇█涓鐨勬牸寮忓寲瀛楃涓茬殑鏍煎紡锛0.8琛ㄧず绮惧害涓灏忔暟鐐瑰悗8浣锛屼緥濡傦細1.123456789浼氭樉绀轰负1.12345678锛屼竴鑸彧鏈夋诞鐐规暟鐨勬牸寮忓寲瀛楃涓叉墠杩欎箞鐢紱0.8涓殑灏忔暟鐐瑰墠鐨勬暟瀛楄〃绀烘诲叡澶氬皯浣嶏紝0琛ㄧず娌￠檺鍒讹紱灏忔暟鐐瑰悗鐨勬暟瀛楄〃绀烘诞鐐规暟绮惧害鏄殑澶氬皯浣嶏紝涔熷氨娴偣鏁扮殑灏忔暟鐐瑰悗鍑犱綅锛...
绛旓細灏忔暟鐐圭畻涓浣嶏紝8浣浠ュ鐨勪笉鍑嗙‘ 8.2f--- 123.46 杈撳嚭8浣嶏紝灏忔暟鐐瑰悗闈2浣嶏紝濡傛灉鍔犱笂灏忔暟鐐规诲叡灏忎簬8浣嶏紝宸﹁竟琛ョ┖鏍硷紝骞朵笖灏忔暟浣鏈夊洓鑸嶄簲鍏ョ殑鏁堟灉 .2f---123.46 杈撳嚭瀹為檯浣嶆暟锛屽皬鏁颁綅2浣嶏紝鍥犱负娌℃湁鍩熷鎺у埗绗︼紝鎵浠ヤ笉鐢ㄨˉ绌烘牸 --- 鏁堟灉鍥惧涓:...
绛旓細鍦╯canf涓紝%f鍜%8f閮借〃绀鸿緭鍏loat鍨嬫暟鎹紝%f榛樿鍙灏忔暟鐐瑰悗6浣嶆湁鏁堟暟锛%8f鍒欓檺瀹氬彧鍙栬緭鍏ユ暟鎹殑鍓8浣(鍚皬鏁扮偣)锛屽浣欑殑琚暀鍦ㄨ緭鍏ョ紦鍐插尯銆傚嵆鏈灏忓搴︿负8浣嶏紙鏈灏戝崰8鏍硷級锛屽皬鏁颁笉瓒崇殑宸﹁竟琛ョ┖鏍笺&锛 涓哄彇鍦板潃杩愮畻绗 scanf()锛屽叾璋冪敤鏍煎紡涓: scanf("<鏍煎紡鍖栧瓧绗︿覆>"锛<鍦板潃琛>);濡...
