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6.c

@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <string.h>
+int cnt=0;
+struct student{
+	int clas,modified;
+    char id[20],name[20];
+    double score1,score2,score3,total;
+}s[10];
+
+void input(){
+	int i,j;
+	for(i=0;i<3;i++){
+		scanf("%s%d%s%lf%lf%lf",s[i].id,&s[i].clas,s[i].name,&s[i].score1,&s[i].score2,&s[i].score3);
+		s[i].modified=0;
+		cnt++;
+		s[i].total=s[i].score1+s[i].score2+s[i].score3;
+	}
+}
+
+void modify(){
+	char str[20];
+	scanf("%s",str);
+	int i=find(str);
+	if(i!=-1){
+		scanf("%d%s%lf%lf%lf",&s[i].clas,s[i].name,&s[i].score1,&s[i].score2,&s[i].score3);
+		s[i].total=s[i].score1+s[i].score2+s[i].score3;
+		s[i].modified=1;
+	}
+}
+
+int find(char str[]){
+	int i;
+	for(i=0;i<cnt;i++){
+		if(strcmp(s[i].id,str)==0||strcmp(s[i].name,str)==0){
+			return i;
+		}
+	}
+	return -1;
+}
+
+void order(){
+	int i,j;
+	for(i=0;i<cnt-1;i++){
+		for(j=0;j<cnt-i-1;j++){
+			if(s[j].clas>s[j+1].clas||(s[j].clas==s[j+1].clas&&s[j].total<s[j+1].total)){
+				struct student t;
+				t=s[j];
+				s[j]=s[j+1];
+				s[j+1]=t;
+			}
+		}
+	}	
+}
+
+void output(){
+	int i;
+	for(i=0;i<cnt;i++){
+		if(i==0||s[i].clas!=s[i-1].clas) printf("%d ",s[i].clas);
+		else printf("   ");
+		printf("%s %s %.1f %.1f %.1f",s[i].id,s[i].name,s[i].score1,s[i].score2,s[i].score3);
+		if(s[i].modified==1) printf(" modified");
+		printf("\n");
+	}
+}
+
+int main(){
+	input();
+	modify();
+	order();
+	output();
+	return 0;
+}
+//10001 11 Zhang 99.5 88.5 89.5
+//10002 12 Yang 77.9 56.5 87.5
+//10003 11 Liang 92.5 99.0 60.5
+//10001 11 Zhang 99 88 89