Summary - Structs

Combine struct, typedef and struct array to write a student database.

Summary - Structs

In this group you learned the basics of structs. struct unites different types; . accesses members. typedef gives a short name; a struct array holds multiple records; nested structs build complex models.

struct Point { int x; int y; };
typedef struct { int id; int grade; } Student;
struct Student students[2];
r.topleft.x

These concepts are the basis of data modeling in C. Without structs, real projects are very hard to write. Now you will do an exercise that combines all of them.

Exercise Average grade of two students

Define struct Student (int id, int grade). Create a two-student array: {{1, 85}, {2, 90}}. Use a for loop to sum the grades; print the total with printf.

Show example solution

struct Student { int id; int grade; };
struct Student students[2] = {{1, 85}, {2, 90}};
int total = 0;
for (int i = 0; i < 2; i++) {
    total += students[i].grade;
}
printf("%d\n", total);

Test yourself

Match concept to usage

struct

Groups data
.

Member access
typedef

Gives short name
struct[3]

Three-element array
How is a variable declared after a typedef struct?
- struct Point p;
- typedef Point p;
- new Point()
- Point p;
Show answer

Point p; — After typedef you write only Point p;

Fill in the blank: array element

printf("%d
", students[0]____);

Show answer

printf("%d
", students[0].grade);

Next lesson: Stack and heap

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