C言語で始めるタイマーの作り方！5つのステップと10のサンプルコード

#include <stdio.h>
#include <time.h>

int main() {
    clock_t start_time;
    start_time = clock();
}

#include <stdio.h>
#include <time.h>

int main() {
    clock_t start_time, current_time;
    start_time = clock();

    while(1) {
        current_time = clock();
        if((current_time - start_time) / CLOCKS_PER_SEC >= 1) {
            printf("1秒経過\n");
            start_time = current_time;
        }
    }
}

#include <stdio.h>
#include <time.h>

int main() {
    time_t start_time, current_time;
    int pause_flag = 0;
    double elapsed_time;

    printf("タイマーをスタートします。\\n");
    start_time = time(NULL);

    while(1) {
        if(pause_flag == 0){
            current_time = time(NULL);
            elapsed_time = difftime(current_time, start_time);
            printf("経過時間: %.2f 秒\\n", elapsed_time);
        }
        if(elapsed_time > 5){
            pause_flag = 1;
            printf("タイマーを一時停止します。\\n");
            break;
        }
    }
    return 0;
}

#include <stdio.h>
#include <time.h>

int main() {
    time_t start_time, current_time, pause_time;
    int pause_flag = 0;
    double elapsed_time;

    printf("タイマーをスタートします。\\n");
    start_time = time(NULL);

    while(1) {
        if(pause_flag == 0){
            current_time = time(NULL);
            elapsed_time = difftime(current_time, start_time);
            printf("経過時間: %.2f 秒\\n", elapsed_time);
        }
        if(elapsed_time > 5){
            pause_flag = 1;
            pause_time = current_time;
            printf("タイマーを一時停止します。\\n");
            break;
        }
    }

    printf("タイマーを再開します。\\n");
    pause_flag = 0;
    start_time += difftime(time(NULL), pause_time);

    while(1) {
        if(pause_flag == 0){
            current_time = time(NULL);
            elapsed_time = difftime(current_time, start_time);
            printf("経過時間: %.2f 秒\\n", elapsed_time);
        }
        if(elapsed_time > 10){
            printf("タイマーを停止します。\\n");
            break;
        }
    }

    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>

volatile int timer_fired = 0;

void timer_handler(int signum) {
    timer_fired = 1;
}

void stop_timer(timer_t timerid) {
    timer_delete(timerid);
}

int main() {
    struct sigaction sa;
    struct sigevent sev;
    struct itimerspec its;
    timer_t timerid;

    // タイマーのハンドラを設定
    sa.sa_flags = SA_SIGINFO;
    sa.sa_sigaction = timer_handler;
    sigemptyset(&sa.sa_mask);
    if (sigaction(SIGRTMIN, &sa, NULL) == -1) {
        printf("sigaction failed\n");
        exit(EXIT_FAILURE);
    }

    // タイマーの設定
    sev.sigev_notify = SIGEV_SIGNAL;
    sev.sigev_signo = SIGRTMIN;
    sev.sigev_value.sival_ptr = &timerid;
    if (timer_create(CLOCK_REALTIME, &sev, &timerid) == -1) {
        printf("timer_create failed\n");
        exit(EXIT_FAILURE);
    }

    // タイマーの開始
    its.it_value.tv_sec = 10;
    its.it_value.tv_nsec = 0;
    its.it_interval.tv_sec = 0;
    its.it_interval.tv_nsec = 0;
    if (timer_settime(timerid, 0, &its, NULL) == -1) {
        printf("timer_settime failed\n");
        exit(EXIT_FAILURE);
    }

    // タイマーの停止
    stop_timer(timerid);

    exit(EXIT_SUCCESS);
}

#include <stdio.h>
#include <unistd.h>

int main() {
    // タイマーの初期設定
    int timer1 = 0, timer2 = 0;
    // タイマーが動作しているかどうかを管理するフラグ
    int timer1Running = 0, timer2Running = 0;

    // タイマー1の開始
    timer1Running = 1;

    // 1秒ごとに繰り返し処理
    for (int i = 0; i < 10; i++) {
        if (timer1Running) {
            timer1++;
            printf("タイマー1: %d秒経過\n", timer1);
        }

        // タイマー2は3秒後に開始
        if (i == 2) {
            timer2Running = 1;
        }

        if (timer2Running) {
            timer2++;
            printf("タイマー2: %d秒経過\n", timer2);
        }

        sleep(1);
    }

    return 0;
}

#include <stdio.h>
#include <unistd.h>

int main() {
    // タイマーの初期設定（10からスタート）
    int timer = 10;

    // 1秒ごとに繰り返し処理
    while (timer > 0) {
        printf("残り%d秒\n", timer);
        timer--;
        sleep(1);
    }

    printf("時間切れです！\n");

    return 0;
}

#include <stdio.h>
#include <unistd.h>

void alarm() {
    printf("アラーム：時間です！\n");
}

int main() {
    // タイマーの初期設定
    int timer = 5;

    // タイマーが動作している間
    while (timer > 0) {
        printf("残り%d秒\n", timer);
        timer--;
        sleep(1);
    }

    // アラームを鳴らす
    alarm();

    return 0;
}

#include <stdio.h>
#include <time.h>

int main() {
    time_t start, end;
    double elapsed;
    char c;

    printf("Enter any key to start the game: ");
    scanf("%c", &c);

    start = time(NULL);

    printf("Game started. Press any key to stop: ");
    scanf("%c", &c);

    end = time(NULL);

    elapsed = difftime(end, start);

    printf("You took %.2f seconds. This is your score.\n", elapsed);

    return 0;
}

Enter any key to start the game: 
Game started. Press any key to stop: 
You took 2.00 seconds. This is your score.

#include <stdio.h>
#include <time.h>

struct Task {
    char name[50];
    time_t start;
    time_t end;
};

void startTask(struct Task *task, const char *name) {
    strcpy(task->name, name);
    task->start = time(NULL);
    printf("Started task: %s\n", task->name);
}

void endTask(struct Task *task) {
    task->end = time(NULL);
    printf("Ended task: %s\n", task->name);
}

void showTaskTime(const struct Task *task) {
    double elapsed = difftime(task->end, task->start);
    printf("Task %s took %.2f seconds.\n", task->name, elapsed);
}

int main() {
    struct Task task;

    startTask(&task, "Project A");
    sleep(5);
    endTask(&task);

    showTaskTime(&task);

    return 0;
}

Started task: Project A
Ended task: Project A
Task Project A took 5.00 seconds.