C语言函数大全--s 开头的函数（2）

#include <graphics.h>
#include <string.h>

/* the names of the line styles supported */
char *lname[] = {
   "SOLID_LINE",
   "DOTTED_LINE",
   "CENTER_LINE",
   "DASHED_LINE",
   "USERBIT_LINE"
   };

int main(void)
{
    int gdriver = DETECT, gmode;

    int style, midx, midy, userpat;
    char stylestr[40];

    initgraph(&gdriver, &gmode, "");

    midx = getmaxx() / 2;
    midy = getmaxy() / 2;

    userpat = 1;

    for (style=SOLID_LINE; style<=USERBIT_LINE; style++)
    {
        setlinestyle(style, userpat, 1);

        strcpy(stylestr, lname[style]);

        line(0, 0, midx-10, midy);

        rectangle(100, 100, getmaxx() - 100, getmaxy() - 100);

        outtextxy(midx, midy, stylestr);

        getch();
        cleardevice();
    }

    closegraph();
    return 0;
}

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

int main()
{
    char *str = (char *)malloc(10);  // 分配 10 字节的内存空间

    // 将 str 中的每个字节都设置为 'A'
    setmem(str, 10, 'A');

    printf("%s\n", str);

    free(str);

    return 0;
}

#include <stdio.h>
#include <fcntl.h>

int main()
{
    int result;
    result = setmode(fileno(stdin), O_TEXT);
    if (result == -1)
        perror("Mode not available\n");
    else
        printf("Mode successfully switched\n");
    return 0;
}

#include <graphics.h>

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    // 将第 5 种颜色设置为红色
    setpalette(5, RED);

    // 绘制一条红色的直线
    setcolor(5);
    line(100, 100, 200, 100);

    getch();
    closegraph();
    return 0;
}

#include <graphics.h>

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    setbkcolor(WHITE);
    cleardevice();

    // 将第 5 种颜色设置为蓝绿色
    setrgbpalette(5, 0, 128, 128);

    // 绘制一条蓝绿色的斜线
    setcolor(5);
    line(100, 100, 200, 200);

    getch();
    closegraph();
    return 0;
}

#include <graphics.h>

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    // 设置文本输出的对齐方式为居中对齐
    settextjustify(CENTER_TEXT, CENTER_TEXT);

    // 输出一行居中对齐的文本
    outtextxy(getmaxx() / 2, getmaxy() / 2, "Hello, world!");

    getch();
    closegraph();
    return 0;
}

#include <graphics.h>

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    // 设置文本输出的字体、方向和大小
    settextstyle(TRIPLEX_FONT, HORIZ_DIR, 4);

    // 输出一行文本
    outtextxy(100, 100, "Hello, world!");

    getch();
    closegraph();
    return 0;
}

#include <stdio.h>
#include <dos.h>

int main(void)
{
    struct  time t;

    gettime(&t);
    printf("The current minute is: %d\n", t.ti_min);
    printf("The current hour is: %d\n", t.ti_hour);
    printf("The current hundredth of a second is: %d\n", t.ti_hund);
    printf("The current second is: %d\n", t.ti_sec);

    t.ti_min++;
    settime(&t);

    return 0;
}

#include <graphics.h>

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    // 设置字符的大小为水平方向放大 2 倍、垂直方向放大 3 倍
    setusercharsize(2, 1, 3, 1);

    // 输出一行文本
    outtextxy(100, 100, "Hello, world!");

    getch();
    closegraph();
    return 0;
}

#include <stdio.h>

int main(void)
{
    FILE *input, *output;
    char bufr[512];

    input = fopen("file.in", "r+b");
    output = fopen("file.out", "w");

    if (setvbuf(input, bufr, _IOFBF, 512) != 0)
        printf("failed to set up buffer for input file\n");
    else
        printf("buffer set up for input file\n");

    if (setvbuf(output, NULL, _IOLBF, 132) != 0)
        printf("failed to set up buffer for output file\n");
    else
        printf("buffer set up for output file\n");

    fclose(input);
    fclose(output);
    return 0;
}

#include <graphics.h>

#define CLIP_ON 1

int main()
{
    int gd = DETECT, gm;
    initgraph(&gd, &gm, "");

    setcolor(RED);
    rectangle(100, 100, 300, 200);

    // 将视口范围设置为矩形 (150, 150) - (250, 250)
    setviewport(150, 150, 250, 250, CLIP_ON);

    setcolor(GREEN);
    rectangle(0, 0, 400, 300);

    getch();
    closegraph();
    return 0;
}

#include <graphics.h>

int main(void)
{
   int gdriver = EGA, gmode = EGAHI;
   int x, y, ht;

   initgraph(&gdriver, &gmode, "");

   x = getmaxx() / 2;
   y = getmaxy() / 2;
   ht = textheight("W");

   setactivepage(1);

   line(0, 0, getmaxx(), getmaxy());

   settextjustify(CENTER_TEXT, CENTER_TEXT);
   outtextxy(x, y, "This is page #1:");
   outtextxy(x, y+ht, "Press any key to halt:");

   setactivepage(0);

   outtextxy(x, y, "This is page #0.");
   outtextxy(x, y+ht, "Press any key to view page #1:");
   getch();

   setvisualpage(1);

   getch();
   closegraph();
   return 0;
}

#include <graphics.h>

int main()
{
   int gdriver = DETECT, gmode;
   int xmax, ymax;

   initgraph(&gdriver, &gmode, "");

   xmax = getmaxx();
   ymax = getmaxy();

   setwritemode(XOR_PUT);

   line(0, 0, xmax, ymax);
   getch();

   line(0, 0, xmax, ymax);
   getch();

   setwritemode(COPY_PUT);

   line(0, 0, xmax, ymax);

   getch();
   closegraph();
   return 0;
}

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

void sigint_handler(int sig) {
    printf("Caught signal %d\n", sig);
    exit(0);
}

int main() {
    signal(SIGINT, sigint_handler);

    while (1) {
        printf("Doing something...\n");
        getchar();
        // check for interrupt signal
        raise(SIGINT);
    }

    return 0;
}

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

int main()
{
    double x = 123.456789;
    float y = -2.5;

    printf("The significand of %lf is %lf\n", x, significand(x));
    printf("The significand of %f is %f\n", y, significandf(y));

    return 0;
}

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

int main()
{
    double x = M_PI / 6.0; // M_PI 圆周率
    float y = M_PI / 4.0L;
    long double z = M_PI / 3.0L;

    printf("sin(%lf) = %lf\n", x, sin(x));
    printf("sinf(%f) = %f\n", y, sinf(y));
    printf("sinl(%Lf) = %Lf\n", z, sinl(z));

    return 0;
}

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

int main()
{
    double x = M_PI / 6.0;
    float y = M_PI / 4.0L;
    long double z = M_PI / 3.0L;

    double sinVal, cosVal;
    float sinfVal, cosfVal;
    long double sinlVal, coslVal;

    sincos(x, &sinVal, &cosVal);
    sincosf(y, &sinfVal, &cosfVal);
    sincosl(z, &sinlVal, &coslVal);

    printf("sincos(%lf) = (%lf, %lf)\n", x, sinVal, cosVal);
    printf("sincosf(%f) = (%f, %f)\n", y, sinfVal, cosfVal);
    printf("sincosl(%Lf) = (%Lf, %Lf)\n", z, sinlVal, coslVal);

    return 0;
}

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

int main()
{
    double x = 1.0;
    float y = 2.0;
    long double z = 3.0;

    printf("sinh(%lf) = %lf\n", x, sinh(x));
    printf("sinhf(%f) = %f\n", y, sinhf(y));
    printf("sinhl(%Lf) = %Lf\n", z, sinhl(z));

    return 0;
}