How can I write this Objective C program correctly? [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 11 years ago.

In need some help with this little programming .. I just got 3 errors ..

:'(

**[

#include <stdio.h>
int main (void)
{
char A , B , C , D , E , F;
float id1[]; <<< *Definition of variable with array type needs an explicit size or an initializer*
float grade[]; <<< *Definition of variable with array type needs an explicit size or an initializer*
float marks[]; <<< *Definition of variable with array type needs an explicit size or an initializer*
float average;
float num1, kk=0;
/********* Jami, Abdulrahman *********/
printf("Enter The Student ID: ");
scanf("%d", &num1);
for (kk=0; kk<num1; kk++);
{
scanf("%d", &id1[kk]);
scanf("%d", &grade[kk]);
}
for (kk=0; kk<num1; kk++);
{
if (grade [kk]>85 &grade [kk]<=100);
A=A+1;

if (grade [kk]>70 &grade [kk]<85);
B=B+1;

if (grade [kk]>55 &grade [kk]<70);
C=C+1;

if (grade [kk]>40 &grade [kk]<55)开发者_开发技巧;
D=D+1;

if (grade [kk]>25 &grade [kk]<40);
E=E+1;

if (grade [kk]>=0 &grade [kk]<25);
F=F+1;
}
/********* Jami, Abdulrahman *********/
float aveerage;
float avrg, sum, lk;

sum = sum + marks[lk];
average = sum / num1;

for (lk=0; lk<num1; lk++);

return average;
}

]**

---

You must give it a size like 3 (it can be any integer though) or something:

For example:

float id1[];
//Should be:
float id1[3]; //Or whatever number you want.

Or you can do:

float id1[] = { 0, 0, 0 }; //To get the same effect as id1[3] where they would all be initialized at zero.

Or even better:

float id1[3] = { }; //Initialize all 3 elements to zero.

---

The error tells you that you need to set a size on these arrays. Try defining them as float myArray[maxMarks]; Of course maxMarks is the maximal number of marks, not the highest mark...

---

Try something like

float *id1;

or

float id1[100];

or

float id1[] = { 1.0, 2.0, 3.3, 7.2, 9.1, 1.5, 4.1 };

The [] can only be empty if you initialize the array with values. if you use float *id1;, you'll have to malloc() memory to use it. The other two are real arrays.

As other said: read the error messages you get and think about what they could mean.