C语言函数大全--s 开头的函数（3）

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

int main()
{
    printf("Start sleeping...\n");
    sleep(5);
    printf("Wake up!\n");

    return 0;
}

#include <stdio.h>
#include <Windows.h>

int main()
{
    printf("Start sleeping...\n");
    Sleep(5000); // 暂停 5 秒钟
    printf("Wake up!\n");

    return 0;
}

#include <stdio.h>
#include <fcntl.h>
#include <io.h>
#include <sys/stat.h>

#define _SH_DENYNO 0x40

int main()
{
    int handle;
    char buffer[1024];

    // 打开文件并读取数据
    handle = sopen("output.bin", _O_RDONLY, _SH_DENYNO, _S_IREAD);
    if (handle == -1) 
    {
        printf("Failed to open file!\n");
        return 1;
    }
    read(handle, buffer, sizeof(buffer));
    printf("File content: %s\n", buffer);

    // 关闭文件句柄
    close(handle);

    return 0;
}

#define _SH_DENYRW 0x10
#define _SH_DENYWR 0x20
#define _SH_DENYRD 0x30
#define _SH_DENYNO 0x40

#include <stdio.h>
#include <windows.h>

int main() 
{
    printf("Playing sound...\n");
    sound(1000); // 发出 1000 Hz 音调
    Sleep(5000); // 等待 5 秒钟
    nosound();   // 停止发声
    printf("Sound stopped.\n");
    return 0;
}

#include <stdio.h>
#include <windows.h>

int main() 
{
    printf("Playing sound...\n");
    Beep(1000, 5000); // 发出 1000 Hz 音调，持续 5 秒钟
    printf("Sound stopped.\n");
    return 0;
}

#include <stdio.h>

int main()
{
    printf("Hello World\n");
    return 0;
}

#include <process.h>
#include <stdio.h>

int main(void)
{
    int result;

    // 要执行的程序名和参数列表
    const char* cmdname = "test.exe";
    const char* arg0 = NULL;

    // 执行程序
    result = spawnl(P_WAIT, cmdname, cmdname, arg0, NULL);
    if (result == -1)
    {
        perror("Error from spawnl");
        exit(1);
    }
    return 0;
}

#include <process.h>
#include <processenv.h>
#include <stdio.h>

int main(int argc, char *argv[], char **envp)
{
    printf("SubEnvTest Command line arguments:\n");
    for (int i=0; i<argc; i++)
        printf("[%d] : %s\n", i, argv[i]);
    printf("exec %s, Hello, %s\n", argv[0], argv[1]);

    for (int i = 0; envp[i] != NULL; i++)
    {
        printf("%s\n", envp[i]);
    }
    return 0;
} 

#include <stdio.h>
#include <stdlib.h>
#include <process.h>

int main(int argc, char *argv[], char *envp[]) 
{
    int result;

    // 启动 SubEnvTest.exe，并传递当前环境变量
    result = spawnle(P_WAIT, "SubEnvTest.exe", "SubEnvTest.exe", NULL, envp);
    if (result == -1) 
    {
        printf("Error: %d\n", errno);
        return 1;
    }

    return 0;
}

#include <stdio.h>

int main() 
{
    char buffer[128];
    int value = 123;

    // 将整数转换为字符串并保存到 buffer 中
    sprintf(buffer, "The value is %d.", value);
    printf("%s\n", buffer);

    return 0;
}

#include <stdio.h>

int main() 
{
    char buffer[5];
    int value = 123456;

    // 将整数转换为字符串并保存到 buffer 中，最大可写入长度为 sizeof(buffer) - 1
    snprintf(buffer, sizeof(buffer), "%d", value);
    printf("%s\n", buffer); // 输出 "1234"

    return 0;
}

#include <stdio.h>
#include <math.h>

int main() 
{
    double x = 2.0;
    float y = 3.0f;
    long double z = 4.0L;

    printf("sqrt(%.1f) = %.2f\n", x, sqrt(x));
    printf("sqrtf(%.1f) = %.2f\n", y, sqrtf(y));
    printf("sqrtl(%.1Lf) = %.2Lf\n", z, sqrtl(z));

    return 0;
}

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

int main() 
{
    int i;

    // 使用当前时间作为种子值
    srand(time(NULL));

    // 生成 10 个随机数并输出到控制台
    for (i = 0; i < 10; i++) 
    {
        printf("%d ", rand());
    }
    printf("\n");

    return 0;
}

#include <stdio.h>

int main() 
{
    char str[] = "hello world 123";
    char buf[16];
    int num;

    // 从字符串中读取一个字符串和一个整数
    if (sscanf(str, "%s %*s %d", buf, &num) == 2) 
    {
        printf("String: %s\n", buf);
        printf("Number: %d\n", num);
    }

    return 0;
}

#include <stdio.h>
#include <sys/stat.h>

int main() 
{
    struct stat file_stat;

    // 获取文件属性信息
    if (stat("test.txt", &file_stat) == 0) {
        printf("File size: %ld bytes\n", file_stat.st_size);
        printf("Creation time: %ld\n", file_stat.st_ctime);
        printf("Modification time: %ld\n", file_stat.st_mtime);
    }

    return 0;
}

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

int main() 
{
    time_t t;

    // 获取当前时间
    time(&t);

    // 输出当前时间
    printf("Current time: %s", ctime(&t));

    // 设置系统时间为 2022 年 1 月 1 日
    struct tm new_time;
    new_time.tm_sec = 0;
    new_time.tm_min = 0;
    new_time.tm_hour = 0;
    new_time.tm_mday = 1;
    new_time.tm_mon = 0;
    new_time.tm_year = 122;
    new_time.tm_wday = 6;
    new_time.tm_yday = 0;
    new_time.tm_isdst = -1;

    t = mktime(&new_time);
    stime(&t);

    // 短暂等待，确保时间设置完成
    sleep(1);

    // 再次输出当前时间
    time(&t);
    printf("New time: %s", ctime(&t));

    return 0;
}

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

int main() 
{
    char src[] = "Hello world";
    char dest[32];

    char *end = stpcpy(dest, src);

    printf("Source string: %s\n", src);
    printf("Destination string: %s\n", dest);
    printf("End pointer: %p\n", end);

    return 0;
}

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

int main() 
{
    char str1[32] = "Hello";
    char str2[] = " world!";

    printf("Before: str1=%s str2=%s\n", str1, str2);

    strcat(str1, str2);

    printf("After: str1=%s\n", str1);

    return 0;
}

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

int main() 
{
    char str[] = "Hello world";
    char* p;

    p = strchr(str, 'o');

    if (p != NULL) {
        printf("Found character '%c' at position %ld\n", *p, p - str);
    }
    else {
        printf("Character not found.\n");
    }

    return 0;
}

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

int main() 
{
    char str1[] = "hello World";
    char str2[] = "hello world";

    int result = strcmp(str1, str2);

    if (result < 0) {
        printf("'%s' is less than '%s'\n", str1, str2);
    }
    else if (result 0) {
        printf("'%s' is greater than '%s'\n", str1, str2);
    }
    else {
        printf("'%s' is equal to '%s'\n", str1, str2);
    }

    return 0;
}

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

int main() {
    char src[] = "Hello world";
    char dest[32];

    strcpy(dest, src);

    printf("Source string: %s\n", src);
    printf("Destination string: %s\n", dest);

    return 0;
}

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

int main() 
{
    char str[] = "Hello world";
    char charset[] = "owd";

    size_t index = strcspn(str, charset);

    if (index != strlen(str)) 
    {
        printf("Found character '%c' at position %ld\n", str[index], index);
    }
    else 
    {
        printf("No matching characters found.\n");
    }

    return 0;
}