没关系！我得到了它的工作感谢你们所有人的帮助。我会在我回来后立即发布解决方案。
基本上，我只是想根据结构数据库的用户输入值来查找类平均值。一切正常，除非我似乎无法获得特定任务的类平均值的正确输出。
这是我正在努力的功能：
编辑（我更改了该功能，但旧版本仍在完整的代码段中。）
例如我会输入： 001 100 100 100
002 50 50 50
-1 0 0 0（终止）
输出结果为：
课堂作业平均分为150.00。
（但应该是75.00）
void classavg（struct grade record [200]） {
int i;
char assign[30];
double classavghw = 0, classavge1 = 0, classavge2 = 0, totalhw = 0, totale1 = 0, totale2 = 0;
i = 0;
while(record[i].euid != -1)
{
totalhw += record[i].hwavg;
totale1 += record[i].exam1;
totale2 += record[i].exam2;
classavghw = totalhw/i;
classavge1 = totale1/i;
classavge2 = totale2/i;
i++;
}
printf("Enter the assignment: (homework, exam1, exam2)\n");
scanf("%s", assign);
if(strcmp(assign, "homework") == 0)
{
printf("The class homework average is: %.2lf\n", classavghw);
}
else if(strcmp(assign, "exam1") == 0)
{
printf("The class exam1 average is: %.2lf\n", classavge1);
}
else if(strcmp(assign, "exam2") == 0)
{
printf("The class exam2 average is: %.2lf\n", classavge2);
}
else
printf("Not a valid input!\n");
}
这是完整的代码：
/*
CSCE Homework 05:
HEADER:
Author: Laura Kent (LauraKent@my.unt.edu) lek0073
Date: 11/9/2014
CSCE 1030
Purpose:
*/
#include <stdio.h>
struct Grade
{
int euid;
double hwavg;
double exam1;
double exam2;
};
void headerinfo(void);
void menu(void);
void database(struct Grade record[200]);
void studentinfo(struct Grade record[200]);
void studentavg(struct Grade record[200]);
void letteravg(int);
void classavg(struct Grade record[200]);
int main()
{
struct Grade record[200];
headerinfo();
char assign[30];
database(record);
int input;
while(1)
{
menu();
scanf("%d",&input);
switch(input)
{
case 1:
studentinfo(record);
break;
case 2:
studentavg(record);
break;
case 3:
classavg(record);
break;
case 4:
printf("Terminating program: Bye-bye!\n");
return 0;
break;
default:
printf("Error! Invalid input.\n\n");
}
}
}
void headerinfo(void)
{
printf("Program: Homwork05.c\nAuthor: Laura Kent (LauraKent@my.unt.edu) lek0073\nCSCE 1030\n");
}
void menu(void)
{
printf("Select one of the following:\n 1. Student grade data \n 2. Student grade average \n 3. Class average for assignment \n 4. Exit\n");
}
void database(struct Grade record[200])
{
int i;
printf("Input each student's EUID, homework average, exam 1 grade, and exam 2 grade: \n\n");
printf("To terminate input '-1' as the student EUID, along with throwaway values for the average and grades.\n");
for(i=0; i<200; ++i)
{
scanf("%d %lf %lf %lf", &record[i].euid, &record[i].hwavg, &record[i].exam1, &record[i].exam2);
if(record[i].euid == -1)
{
break;
}
}
}
void studentinfo(struct Grade record[200])
{
int i, x;
printf("Enter the student's EUID:\n");
scanf("%d", &x);
i = 0;
while(record[i].euid != -1 && record[i].euid != x)
{
i++;
}
printf("EUID:%d Homework: %.2f Exam 1:%.0f Exam2: %.0f\n", record[i].euid, record[i].hwavg, record[i].exam1, record[i].exam2);
}
void studentavg(struct Grade record[200])
{
int i, x;
float gradeavg;
printf("Enter the student's EUID:\n");
scanf("%d", &x);
i = 0;
while(record[i].euid != -1 && record[i].euid !=x)
{
i++;
}
gradeavg = (record[i].hwavg * 0.5) + (record[i].exam1 * 0.25) + (record[i].exam2 * 0.25);
printf("EUID:%d Grade average:%.2lf\n", record[i].euid, gradeavg);
letteravg(gradeavg);
}
void letteravg(average)
{
char letter;
if(average > 89.50)
{
letter = 'A';
}
else if(average <= 89.4999 && average > 79.50)
{
letter = 'B';
}
else if(average <= 79.4999 && average > 69.50)
{
letter = 'C';
}
else if(average <= 69.4999 && average > 59.50)
{
letter = 'D';
}
else
{
letter = 'F';
}
printf("Letter grade:%c\n", letter);
}
void classavg(struct Grade record[200])
{
int i;
char assign[30];
double classavghw = 0, classavge1 = 0, classavge2 = 0, totalhw = 0, totale1 = 0, totale2 = 0;
i = 0;
while(record[i].euid != -1)
{
totalhw += record[i].hwavg;
totale1 += record[i].exam1;
totale2 += record[i].exam2;
classavghw = totalhw/i;
classavge1 = totale1/i;
classavge2 = totale2/i;
i++;
}
printf("Enter the assignment: (homework, exam1, exam2)\n");
scanf("%s", assign);
if(strcmp(assign, "homework") == 0)
{
printf("The class homework average is: %.2lf\n", classavghw);
}
else if(strcmp(assign, "exam1") == 0)
{
printf("The class exam1 average is: %.2lf\n", classavge1);
}
else if(strcmp(assign, "exam2") == 0)
{
printf("The class exam2 average is: %.2lf\n", classavge2);
}
else
printf("Not a valid input!\n");
}
答案 0 :(得分：0)
你没有发布整个代码，但初看起来，似乎你的问题是你从未初始化
double classavghw, classavge1, classavge2, totalhw, totale1, totale2;
这些变量。
此外，在您的代码中，在while()循环中，您过早地递增i [除非这是设计要求，否则无法在没有完整代码的情况下确定]。通常，在循环执行添加后，索引i应该递增。
如果您编辑并添加更多信息，我们可以提供更多线索。