Why My C program got error???

[no3l2001]

这是题目：
---------------------------------------------------------------------
Write an interactive C program which will process test, assignment and final exam marks for the Java programming course. Full marks for test is 20%, assignment 20% and final exam is 60%. Enter the students name and their marks for the continuous assessment above repetitively. The marks’ grade are shown in the table below:
Grade marks
A 80-100
B+ 75-79
B 70-74
B- 65-69
C+ 60-64
C 55-59
C- 50-54
D 40-49
E 35-39
F 0-34

(a) Count and display total number of students
(b) For each assignment, test and final exam component, which have been obtained by the class, determine:
• Total marks for assignment, total marks for test and total marks for final exam
• Average marks for assignment, total marks for test and total marks for final exam

For every student, display the following information:
(i) Student name, total marks for assignment, test and final exam for every student (marks over hundred)
(ii) Mark’s grade Use array concept to solve the problem above.. Make sure the labels for output are clear.

---------------------------------------------------------------------

这是我的答案：

#include<stdio.h>
#include<string.h>
#define no 2
main()
{
int i,test[no],assign[no],exam[no],total_marks[no];
char stud_name[no],grade[no];
int total_test=0;
int total_assign=0;
int total_exam=0;
float ave_assign,ave_test,ave_exam;

clrscr();
for(i=0;i<no;i++)
{ printf("\nStudent's Name > ");
gets(stud_name[i]);
printf("Assignment Marks (20%) > ");
scanf("%d", &assign[i]);
printf("Test Marks (20%) > ");
scanf("%d", &test[i]);
printf("Final Exam Marks (60%) > ");
scanf("%d", &exam[i]);

total_test+=test[i];
total_assign+=assign[i];
total_exam+=exam[i];
total_marks[i]=test[i]+assign[i]+exam[i];

if(total_marks[i]>=80 && total_marks[i]<=100)
strcpy(grade[i],"A");
else if(total_marks[i]>=75 && total_marks[i]<=79)
strcpy(grade[i],"B+");
else if(total_marks[i]>=70 && total_marks[i]<=74)
strcpy(grade[i],"B");
else if(total_marks[i]>=65 && total_marks[i]<=69)
strcpy(grade[i],"B-");
else if(total_marks[i]>=60 && total_marks[i]<=64)
strcpy(grade[i],"C+");
else if(total_marks[i]>=55 && total_marks[i]<=59)
strcpy(grade[i],"C");
else if(total_marks[i]>=50 && total_marks[i]<=54)
strcpy(grade[i],"C-");
else if(total_marks[i]>=40 && total_marks[i]<=49)
strcpy(grade[i],"D");
else if(total_marks[i]>=35 && total_marks[i]<=39)
strcpy(grade[i],"E");
else if(total_marks[i]>=0 && total_marks[i]<=34)
strcpy(grade[i],"F");
else
strcpy(grade[i],"Error");

}
ave_test=(float)total_test/no;
ave_assign=(float)total_assign/no;
ave_exam=(float)total_exam/no;

printf("\nTotal Number of Students >> %d",no);
printf("\nTotal Marks for Assignment >> %d",total_assign);
printf("\nTotal Marks for Test >> %d",total_test);
printf("\nTotal Marks for Final Exam >> %d",total_exam);
printf("\n\nAverage Marks for Assignment >> %.2f",ave_assign);
printf("\nAverage Marks for Test >> %.2f",ave_test);
printf("\nAverage Marks for Final Exam >> %.2f",ave_exam);

printf("\n---------------------------------------------------------");
printf("\n no Student Name Assignment Test Exam Total Grade");
printf("\n---------------------------------------------------------");
for(i=0;i<no;i++)
{
printf("\n %d %s %d %d %d %d %s",i+1,stud_name[i],assign[i],test[i],exam[i],total_marks[i],grade[i]);
}
getch();

}




为何当我RUN时，输入第一人的资料后就有问题了，直接就打印答案?

[Arthur_]

emit //ignore

[no3l2001]

oic...
so my program cannot changed to user key in no?
because of that, i put a define no 2 there...


你们获得得分有什么好处？

[Arthur_]

much more recognition

[no3l2001]

ic.
u r student or ?

here is a good place... i post the question and immediately got response. you ppl r good..

[Arthur_]

so my program cannot changed to user key in no?
=====================================
you can make it by pointer as follows:


int *test;

/*key in code area */
test=(int *)malloc(sizeof(int)*no);

[no3l2001]

i am not very good in this:

int *test;

/*key in code area */ <---------------- key in what code here?
test=(int *)malloc(sizeof(int)*no);

[Arthur_]

a book called <pointer on c> may help you ,try

[no3l2001]

i have a data structure book. just sometimes, when i use the sample coding to run, it comes out with error...

[Arthur_]

int *test;

/*key in code area */ <---------------- key in what code here?
test=(int *)malloc(sizeof(int)*no);

=====================================
printf(" how many students > ")
scanf("%d", no);

[Arthur_]

first you should have a better compiler, i suggest "gcc" or "dev c++"
next you should got a better book like <c pointer on c> or<c_expert>
but i think you should read <c pointer on c> first

[no3l2001]

got error...

main()
{
int i,test[no],assign[no],exam[no],total_marks[no];
char stud_name[no],grade[no];
int total_test=0;
int total_assign=0;
int total_exam=0;
float ave_assign,ave_test,ave_exam;
char c;
int *p; <--------------------------i put here

clrscr();
p=(int *)malloc(sizeof(int)*no); <--------------------------i put here
printf(" how many students > ") <--------------------------i put here
scanf("%d", no); <--------------------------i put here
for(i=0;i<no;i++)
{ printf("\nStudent's Name > ");
gets(stud_name[i]);
printf("Assignment Marks (20%) > ");
scanf("%d", &assign[i]);
while((c=getchar())!='\n');
printf("Test Marks (20%) > ");
scanf("%d", &test[i]);
while((c=getchar())!='\n');
printf("Final Exam Marks (60%) > ");
scanf("%d", &exam[i]);
while((c=getchar())!='\n');
total_test+=test[i];
total_assign+=assign[i];
total_exam+=exam[i];
total_marks[i]=test[i]+assign[i]+exam[i];

if(total_marks[i]>=80 && total_marks[i]<=100)
strcpy(grade[i],"A");

[Arthur_]

int total_assign=0;
int total_exam=0;
float ave_assign,ave_test,ave_exam;
char c;
int *p; <--------------------------i put here

clrscr();
<--------------------------i put here
printf(" how many students > ") <--------------------------i put here
scanf("%d", no); <--------------------------i put here
p=(int *)malloc(sizeof(int)*no);
for(i=0;i<no;i++)
{ printf("\nStudent's Name > ");
gets(stud_name[i]);
printf("Assignment Marks (20%) > ");
scanf("%d", &assign[i]);

[no3l2001]

but the declaration up there eg: int i,test[no],assign[no],exam[no],total_marks[no];
got error

[Arthur_]

delete all
use int *test,*assign,....,instead

[no3l2001]

i try first

[no3l2001]

got problem after running:

#include<stdio.h>
#include<string.h>
/*#define no 2*/
main()
{
int i,*test,*assign,*exam,*total_marks;
char *stud_name,*grade;
int total_test=0;
int total_assign=0;
int total_exam=0;
float ave_assign,ave_test,ave_exam;
char c;
int *p;
int no;
clrscr();

printf(" how many students > ");
scanf("%d", no);
p=(int *)malloc(sizeof(int)*no);
for(i=0;i<no;i++)
{ printf("\nStudent's Name > ");
gets(stud_name[i]);
printf("Assignment Marks (20%) > ");
scanf("%d", &assign[i]);
while((c=getchar())!='\n');
printf("Test Marks (20%) > ");
scanf("%d", &test[i]);
while((c=getchar())!='\n');
printf("Final Exam Marks (60%) > ");
scanf("%d", &exam[i]);
while((c=getchar())!='\n');
total_test+=test[i];
total_assign+=assign[i];
total_exam+=exam[i];
total_marks[i]=test[i]+assign[i]+exam[i];

if(total_marks[i]>=80 && total_marks[i]<=100)
strcpy(grade[i],"A");
else if(total_marks[i]>=75 && total_marks[i]<=79)
strcpy(grade[i],"B+");
else if(total_marks[i]>=70 && total_marks[i]<=74)
strcpy(grade[i],"B");
else if(total_marks[i]>=65 && total_marks[i]<=69)
strcpy(grade[i],"B-");
else if(total_marks[i]>=60 && total_marks[i]<=64)
strcpy(grade[i],"C+");
else if(total_marks[i]>=55 && total_marks[i]<=59)
strcpy(grade[i],"C");
else if(total_marks[i]>=50 && total_marks[i]<=54)
strcpy(grade[i],"C-");
else if(total_marks[i]>=40 && total_marks[i]<=49)
strcpy(grade[i],"D");
else if(total_marks[i]>=35 && total_marks[i]<=39)
strcpy(grade[i],"E");
else if(total_marks[i]>=0 && total_marks[i]<=34)
strcpy(grade[i],"F");
else
strcpy(grade[i],"Error");

}
ave_test=(float)total_test/no;
ave_assign=(float)total_assign/no;
ave_exam=(float)total_exam/no;

printf("\nTotal Number of Students >> %d",no);
printf("\nTotal Marks for Assignment >> %d",total_assign);
printf("\nTotal Marks for Test >> %d",total_test);
printf("\nTotal Marks for Final Exam >> %d",total_exam);
printf("\n\nAverage Marks for Assignment >> %.2f",ave_assign);
printf("\nAverage Marks for Test >> %.2f",ave_test);
printf("\nAverage Marks for Final Exam >> %.2f",ave_exam);

printf("\n---------------------------------------------------------");
printf("\n no Student Name Assignment Test Exam Total Grade");
printf("\n---------------------------------------------------------");
for(i=0;i<no;i++)
{
printf("\n %d %s %d %d %d %d %s",i+1,stud_name[i],assign[i],test[i],exam[i],total_marks[i],grade[i]);
}
getch();

}

[Arthur_]

int i,*test,*assign,*exam,*total_marks;
char *stud_name,*grade;
int total_test=0;
int total_assign=0;
int total_exam=0;
float ave_assign,ave_test,ave_exam;
char c;
int no;
clrscr();

printf(" how many students > ");
scanf("%d", no);
test=(int *)malloc(sizeof(int)*no);
assign=(int *)malloc(sizeof(int)*no);
...

[no3l2001]

did u run it?
i think cannot work.

[Arthur_]

i didn't ,because you problem still have other problems
for example
1 you should use include a file "#include<stdlib.h>"
2.gets(stud_name[i]); stud_name is a "char" but gets() function need a "char *"
and so on ...

please read someting about "pointer"

[no3l2001]

2.gets(stud_name[i]); stud_name is a "char" but gets() function need a "char *"
and so on ...
=======================================================

how to implement it?

i am sorry to trouble you..... i will work harder...

i have object oriented question to ask and it is about Use Case Diagram... but i think here cannot upload picture rite?