'temp' is undeclared, first use this function - c++

Question

#include<iostream>
#include<conio.h>
#include<string>
#include<cstring>
#include<stdlib.h>
using namespace std;
bool rgstr_stdnt(struct student *stud,struct list *ls);
double calculate_aggregate(struct student *);
void srch_student(struct student * next);
void addToList(struct student *stud, struct list *l);
void display(struct student *stud, struct list *l);
struct student
{
char name[20];
int matric_marks, inter_marks, aptitude_marks;
int temp;
student *next;
};
struct list
{
char name[20];
double aggr;
list *next;
};
this is where the problem shows up, it says temp undeclared, first use this function and I'm not able to rectify it
void srch_stdnt(struct student *stud)
{
char name[60];
cout << "Enter Student to search :";
cin>>name;
cout << name;
//down here, the error comes and whatever i knew, i have tried to solve it but could not
while (temp!=NULL){
if(strcmp(temp->name, name)==0){
}
temp = temp->next;
}
cout << "No match found";
}
int main()
{
student * temp=new student();
student *s;
s = (struct student *) malloc(sizeof(struct student));
struct list *ls;
ls = (struct list *) malloc(sizeof(struct list));
strcpy(ls->name,"");
ls->aggr = 0;
ls->next= NULL;
do
{
cout<<" STUDENT ENROLLMENT AND RECORDS MANAGEMENT"<<endl;
cout<<"1- To Enroll A New Sudent."<<endl;
cout<<"2- To View The Enrolled Students."<<endl;
cout<<"3- To Search Through The Already Enrolled Students."<<endl;
cout<<"4- Exit."<<endl;
int input;
cin>>input;
if (input == 1)
{
rgstr_stdnt(s, ls);
}
else if (input == 2)
{
display(s, ls);
}
else if(input == 3)
{
void srch_student(struct student * stud);
}
else if (input == 4)
exit(0);
cout<<endl;
} while(1);
getch();
}
bool rgstr_stdnt(struct student *stud,struct list *ls)
{
student *s = stud;
cout<<"Enter Name Of The Student: "<<endl;
cin>>s->name;
cout<<"Enter Percentage in 10th Grade: "<<endl;
cin>>s->matric_marks;
cout<<"Enter Intermediate Percentage:"<<endl;
cin>>s->inter_marks;
cout<<"Enter Percentage In Aptitude Test: "<<endl;
cin>>s->aptitude_marks;
double aggregate;
aggregate = calculate_aggregate(s);
cout<<"Aggregate Percentage Is: "<< aggregate<<"%"<<endl;
if (aggregate >= 70)
{
cout<<"-> Student Enrolled In BSCS. <-"<<endl;
addToList(s,ls);
return true;
}
else if (aggregate >= 60)
{
cout<<"-> Student Enrolled In BE. <-"<<endl;
addToList(s,ls);
return true;
}
else if (aggregate >=50)
{
cout<<"-> Student Enrolled In MS. <-"<<endl;
addToList(s,ls);
return true;
}
else
{
cout<<"Sorry, Low Percentage. Student Can't Be Enrolled!"<<endl;
return false;
}
}
double calculate_aggregate(struct student *stud)
{
student *s = stud;
double aggr;
aggr = s->matric_marks * 10/100 + s->inter_marks * 50/100 +
s->aptitude_marks * 40/100;
return aggr;
}
void addToList(struct student *stud, struct list *l)
{
list *pointer = l;
while (pointer->next != NULL)
{
pointer = pointer->next;
}
pointer->next = (struct list *) malloc(sizeof(struct list));
pointer = pointer->next;
strcpy(pointer->name , stud->name);
pointer->aggr = calculate_aggregate(stud);
pointer->next = NULL;
}
void display(struct student *stud, struct list *l)
{
list *pointer = l;
if (pointer->next == NULL)
cout<<"No Students Enrolled Yet."<<endl;
else
{
cout<<" !- - - - - - - - -. STUDENTS RECORDS .- - - - - - - - - -! "
<<endl;
while (pointer->next != NULL)
{
pointer = pointer->next;
cout<<"Name Of Student: "<<pointer->name<<endl;
cout<<"Aggregate Is: "<<pointer->aggr<<endl;
if (pointer->aggr >= 70)
cout<<"-> Student Enrolled In BSCS. <-"<<endl;
else if(pointer->aggr >=60)
cout<<"-> Student Enrolled In BE. <-"<<endl;
else
cout<<"-> Student Enrolled In MS. <-"<<endl;
cout<<endl;
}
}
}
Any who could help me solve this, i'd really be grateful.

Answer 1

As the error message states, you're using a variable called temp that you haven't declared yet. You need to declare it and give it an initial value:
struct student *temp = stud;
while (temp!=NULL){
...

Answer 2

//down here, the error comes and whatever i knew, i have tried to solve it but could not
while (temp!=NULL){
You have not declared temp in the function. That explains the compiler error.
Perhaps you meant to use:
struct student* temp = stud;
while ( temp != NULL )
Since you are in C++ land, discard the struct and use:
student* temp = stud;
while ( temp != NULL )
That change change can be made in rest of your code too.