C言語のswitch文｜case・break・default

C言語のswitch文｜case・break・default (c言語 switch): 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switch文｜case・break・default

This guide covers c言語 switch 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 switch — Syntax & Best Practices

When working with c言語 switch, 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 option = 2;
    switch (option) {
        case 1:
            printf("Option 1\n");
            break;
        case 2:
            printf("Option 2\n");
            break;
        default:
            printf("Other\n");
            break;
    }
    return 0;
}