ONLINE_JUDGE

POJ上已经定义了ONLINE_JUDGE. 所以要用"ifndef", 本地IDE中的宏定义删了. scanf: %f小数点后6位 %G和%g 小数点后2位,但是自动会去除末尾的0

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#include "stdio.h"   int main(void) {     float c;     float result=0.0;     #ifndef ONLINE_JUDGE     freopen("in.txt","r",stdin);     #else     #endif     while((scanf("%G",&c))!=EOF){           //printf("%Gn",c);          result = result + c;          //printf("%Gn",result);     }       printf("$%G",result/12);     #ifndef ONLINE_JUDGE     fclose(stdin);     #else     #endif     return 0; }