[1] 授業単元：C言語
[2] 問題文(含コード&リンク)： #include <stdio.h> struct man1{ char name[20];double kokugo;double sansu; }; strut man2{char name[20];double kokugo; double sansu;};struct man3{char name[20]double kokugo;double sansu;}; main()
{ struct man1 student1;
struct man2 student2;
struct man3 student3;
strcpy(student1.name,"SHARON" );
student1.kokugo=80;
student1.sansu=75;
printf("氏名:%s\n",student1.name );
printf("国語:%f\n",student1.kokugo );
printf("算数:%6.2f\n",student1.sansu );
strcpy(student2.name,"SATOH" );
student2.kokugo=81;
student2.sansu=76;
printf("氏名:%s\n",student2.name );
printf("国語:%f\n",student2.kokugo );
printf("算数:%6.2f\n",student2.sansu );
strcpy(student3.name,"SAKAI" );
student3.kokugo=86;
student3.sansu=73;
printf("氏名:%s\n",student3.name );
printf("国語:%f\n",student3.kokugo );
printf("算数:%6.2f\n",student3.sansu ); }このプログラムを改造する
１．出力で３人の国語の平均点と３人の算数の平均点を出す
[3] 環境
　[3.1] OS：Windows 7
　[3.2] コンパイラ名とバージョン：Visual Studio 2010
　[3.3] 言語： C
[4] 期限：2010年11月29日