used without being initialized

it says stu_id is used without being initialized. What should I do about it?

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  void print_all_courses_all_students(struct student student_list[],int *stu_count)
{


       // int i;
		 char course_name[7];
        int temp=0;
        int i, stu_index;
       // struct class1 *p1;
        struct class1 *p1;
        for (i=0; i<*stu_count; i++)
			 if (student_list[i].id != -1) 
                        cout<<student_list[i].id<<"\n";//cout<< "Student "<<stu_id<< "does not exist.";

        for (i=0; i< *stu_count; i++)    
		{
			int stu_id;
			if (stu_id == student_list[i].id) stu_index = i;}
                       
         class1* head = student_list[stu_index].p_class_from_student;
         class1* tmp = head;
         while(tmp != NULL){
                        class1 *A, *B;
            A = head; 
            B = A->p_class;
            while(B != NULL){
               int result = strcmp (A->course_name, B->course_name);           
               //If value is less than 0 then perform swap function to rearrange                
                if (result > 0){
                     char tmp[7];
                                         strcpy(tmp, A->course_name);
                                         strcpy(A->course_name, B->course_name);
                                         strcpy(B->course_name, tmp);
                                        
                }
                                A = A->p_class;
                                B = A->p_class;
                                        
           }
           tmp = tmp->p_class;
        }

                if (student_list[i].id != -1) {
                       // cout<<"\nThe course(s) of student with ID %d: \n\n", student_list[i].id;
						  cout<<"\nThe course(s) of student with ID "<<student_list[i].id<< ": \n\n";
                        cout<<"Course Name   Section No.   No. of Credit(s) \n";
                        p1 = student_list[i].p_class_from_student;
                        while (p1 != NULL) {

                                        cout << p1->course_name << "            " << p1->section << "                " << p1->credit<<"\n";
                                p1 = p1->p_class;
                        }
                }
} 
┬┐initialize it?
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			int stu_id;
			if (stu_id == student_list[i].id)
┬┐what do you expect to happen there?
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