C Typedef

#include <stdio.h>
int main()
{
typedef int rectangle; //creating new data type name rectangle using typedef
rectangle length, breadth, area;//declaring variables using new data type name rectangle
printf("\nEnter length and breath of the rectangle ");
scanf("%d %d ", &length, &breadth);
area = length * breadth;
printf("\nArea = %d ", area);
return 0;
}

#include <stdio.h>
int main()
{
typedef struct {
char name[30];
int rollNo;
}list;
list stud1; //Declaring variable using new struct data type name list
printf("\nEnter the name of the student : ");
scanf("%s", stud1.name);
printf("\nEnter the Roll number of the student : ");
scanf("%d",&stud1.rollNo);
printf("\nName: %s \nRoll No.: %d ", stud1.name, stud1.rollNo);
return 0;
}