C言語の構造体（struct）｜宣言・初期化・typedef

C言語の構造体（struct）｜宣言・初期化・typedef (c言語 構造体): practical C programming guide with runnable standard C17 source code that you can edit, compile, and test directly in your browser.

1. C言語の構造体（struct）｜宣言・初期化・typedef

This guide covers c言語 構造体 in standard C (C17) with clear syntax rules and practical compiler patterns. You can run and modify the complete C program below in the online GCC compiler without installing a local IDE.

2. c言語 構造体 — Syntax & Best Practices

When working with c言語 構造体, always compile with -Wall -Wextra, initialize variables before reading them, and verify input/boundary conditions to prevent undefined behavior.

#include <stdio.h>

typedef struct {
    int id;
    double score;
} Student;

int main(void) {
    Student s = {101, 94.5};
    printf("ID: %d | Score: %.1f\n", s.id, s.score);
    return 0;
}