Try It Yourself - SyntaxStudy Editor

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#include <stdio.h>
#include <string.h>

/* Struct with typedef */
typedef struct {
    double x;
    double y;
} Point;

typedef struct {
    char   name[64];
    int    id;
    double salary;
} Employee;

/* Pass by pointer for efficiency */
void give_raise(Employee *emp, double percent)
{
    emp->salary *= (1.0 + percent / 100.0);
}

double distance(Point a, Point b)
{
    double dx = a.x - b.x;
    double dy = a.y - b.y;
    /* Approximation without <math.h> for brevity */
    double sq = dx * dx + dy * dy;
    /* Newton-Raphson sqrt approximation */
    double r = sq;
    for (int i = 0; i < 20; i++)
        r = (r + sq / r) / 2.0;
    return r;
}

int main(void)
{
    Point p1 = {0.0, 0.0};
    Point p2 = {3.0, 4.0};
    printf("Distance: %.2f
", distance(p1, p2));  /* 5.00 */

Employee emp;
    strncpy(emp.name, "Alice", sizeof(emp.name) - 1);
    emp.id     = 101;
    emp.salary = 50000.0;

printf("Before raise: %.2f
", emp.salary);
    give_raise(&emp, 10.0);
    printf("After 10%% raise: %.2f
", emp.salary);

/* Struct assignment (shallow copy) */
    Employee copy = emp;
    copy.salary = 1.0;
    printf("Original salary unchanged: %.2f
", emp.salary);

return 0;
}