Whitewater High School has contracted you to write a program that will
read a file of student names and test scores in the formation FIRST
NAME LAST NAME: SCORE1 SCORE2 SCORE3, where each of the scores is an
integer. Then your program is to print a report, sorted by last name
with each of the last names fully capitalized (that is, if you read in
Wilkinson you print WILKINSON) followed by a comma, then the first
name, then a colon, then the scores, then the average for the student,
and lastly a letter grade (based upon 90 percent or greater being an
"A," 80 percent or greater being a "B," and so forth). At the end of
the report the averages for each test are to be printed also. Needless
to say, the report must be written to a file and must be "pretty" (in
proper columns and such). (HINT: Read in the whole line as a string,
switch the first and last name, sort the names, then compute the math)
Data file: data.txt
You must turn in print outs of your report and the documented program
on Wednesday, May 30, 2007.

[CODE]#include <fstream>
#include <sstream>
#include <string>
#include <iostream>
#include <vector>
#include <algorithm>
#include <cassert>
using namespace std;
typedef vector<string>::iterator iter;
int main(){
vector<string> svec;
//read file
ifstream fin("data.dat");
assert(fin);
string strLine;
while (getline(fin,strLine))
svec.push_back(strLine);
//rebulid name and process the scores
string firstName,lastName;
int score1,score2,score3,sum1 = 0,sum2 = 0,sum3 = 0;
for (iter p = svec.begin();p != svec.end();++p){
istringstream strm_in(*p);
strm_in >> firstName >> lastName
>> score1 >> score2 >> score3;
ostringstream strm_out;
strm_out << score1 << " " << score2 << " " << score3;
//reset position of name
lastName.erase(--lastName.end()); //remove the ':' at end
//make last name to uppercase
string::iterator q = lastName.begin();
while (q != lastName.end()){
*q = toupper(*q);
++q;
}
//compute average for each student
int avg = (score1 + score2 + score3) / 3;
strm_out << "\t" << avg;
if (avg >= 90) strm_out << "\tA";
else if (avg >= 80) strm_out << "\tB";
else if (avg >= 70) strm_out << "\tC";
else strm_out << "\tD";
//compute sum
sum1 += score1;
sum2 += score2;
sum3 += score3;
//relink the data
*p = lastName + " , " + firstName + " : " + strm_out.str();
}
//sort the data base on last name
sort(svec.begin(),svec.end());
//print result
for (iter p = svec.begin();p != svec.end();++p)
cout << *p << endl;
cout << sum1 / svec.size() << endl;
cout << sum2 / svec.size() << endl;
cout << sum3 / svec.size() << endl;
}[/CODE]

不知道是不是符合题目意思，你凑合看看先。
环境：vc++2005

[此贴子已经被作者于2007-5-29 10:28:13编辑过]