C言語のポインタをわかりやすく解説｜図解とサンプル

C言語のポインタをわかりやすく解説｜図解とサンプル (c言語 ポインタ): practical C programming guide with runnable standard C17 source code that you can edit, compile, and test directly in your browser.

1. C言語のポインタをわかりやすく解説｜図解とサンプル

This guide covers c言語 ポインタ 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 ポインタ — Syntax & Best Practices

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

#include <stdio.h>

int main(void) {
    int value = 42;
    int *ptr = &value;
    printf("Value = %d, Dereferenced = %d\n", value, *ptr);
    *ptr = 99;
    printf("Updated value = %d\n", value);
    return 0;
}