C语言函数大全--s 开头的函数（1）

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

int main() {
    void *mem = sbrk(64);

    if (mem == (void *)-1) {
        perror("sbrk");
        return 1;
    }

    printf("Allocated 64 bytes at address %p\n", mem);

    return 0;
}

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

int main() {
    double x = 3.14159265359;
    double y = scalb(x, 10);

    printf("Before: %lf\n", x);
    printf("After: %lf\n", y);

    return 0;
}

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

int main() {
    double x = 1.5;
    float y = 2.25f;
    long double z = 3.75l;
    long int n = 3;
    // 将x乘以2的3次幂
    double result = scalbln(x, n);
    printf("scalbln(%lf, %ld) = %lf\n", x, n, result);

    float resultf = scalblnf(y, n);
    printf("scalblnf(%f, %ld) = %f\n", y, n, resultf);

    long double resultL = scalblnl(z, n);
    printf("scalblnl(%Lf, %ld) = %Lf", z, n, resultL);

    return 0;
}

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

int main()
{
    double x = 3.1415926;
    float y = 3.1415926f;
    long double z = 3.1415926L;
    int n = 5;

    printf("scalbn(%lf, %d) = %.20lf\n", x, n, scalbn(x, n));
    printf("scalbnf(%f, %d) = %.20f\n", y, n, scalbnf(y, n));
    printf("scalbnl(%Lf, %d) = %.20Lf\n", z, n, scalbnl(z, n));

    return 0;
}

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

int main()
{
    char name[20];

    scanf("%s", name);

    printf("Welcome, %s", name);

    return 0;
}

#include <graphics.h>

int main(void)
{
   int gdriver = DETECT, gmode;
   int midx, midy, i;
   int stangle = 45, endangle = 135;
   int xrad = 100, yrad = 50;

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

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

   for (i=EMPTY_FILL; i<USER_FILL; i++)
   {
      setfillstyle(i, getmaxcolor());

      sector(midx, midy, stangle, endangle, xrad, yrad);

      getch();
   }

   closegraph();
   return 0;
}

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

int main() {
    struct SREGS regs;
    segread(&regs);  // 读取段寄存器的值
    printf("Data segment: %04X\n", regs.ds);
    printf("Code segment: %04X\n", regs.cs);
    printf("Stack segment: %04X\n", regs.ss);
    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>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

int main(void)
{
    int gdriver = DETECT, gmode;
    struct palettetype pal, copypal;
    int color, ht;
    int y = 10;
    char msg[80];

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

    ht = 2 * textheight("W");

    getpalette(&pal);

    for (color = 1; color <= MAXCOLORS; color++)
    {
        sprintf(msg, "old colors[%d]: %d", color, pal.colors[color]);
        outtextxy(1, y, msg);
        y += ht;
    }

    for (color = 1; color <= MAXCOLORS; color++)
    {
        setpalette(color, BLACK);
    }

    getpalette(&copypal);

    getch();

    y = 10;
    for (color = 1; color <= MAXCOLORS; color++)
    {
        sprintf(msg, "new colors[%d]: %d", color, copypal.colors[color]);
        outtextxy(150, y, msg);
        y += ht;
    }

    getch();
    // 重置调色板
    setallpalette(&pal);

    getpalette(&pal);

    y = 10;
    for (color = 1; color <= MAXCOLORS; color++)
    {
        sprintf(msg, "old colors[%d]: %d", color, pal.colors[color]);
        outtextxy(300, y, msg);
        y += ht;
    }

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

#include <graphics.h>

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

    // 设置水平和垂直缩放比例为 2:1
    setaspectratio(2, 1);

    // 在图形窗口中绘制一个正方形
    rectangle(100, 100, 200, 200);

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

#include <graphics.h>

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

    // 设置背景色为蓝色
    setbkcolor(BLUE);

    // 清除先前绘制的图形
    cleardevice();

    // 在图形窗口中绘制一条线段
    line(100, 100, 200, 200);

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

#include <stdio.h>

int main()
{
    FILE *fp;

    // 打开文件，并设置为不带缓冲
    fp = fopen("test.txt","w");
    setbuf(fp, NULL);

    // 写入数据到文件中
    fprintf(fp, "This is a line of text.");

    // 关闭文件
    fclose(fp);

    return 0;
}

#include <graphics.h>

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

    setbkcolor(WHITE);

    cleardevice();

    // 设置绘画颜色为红色
    setcolor(RED);

    // 在图形窗口中绘制一条直线
    line(100, 100, 200, 200);

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

#include <graphics.h>

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

    char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00};

    // 初始化图形模式
    initgraph(&gdriver, &gmode, "");

    // 获取屏幕的最大 X 和 Y 坐标
    maxx = getmaxx();
    maxy = getmaxy();

    // 设置当前颜色为最大颜色值
    setcolor(getmaxcolor());

    // 设置填充图案
    setfillpattern(pattern, getmaxcolor());

    // 用填充图案填满整个窗口
    bar(0, 0, maxx, maxy);

    // 等待用户按下任意键后关闭窗口
    getch();
    closegraph();

    return 0;
}

#include <stdio.h>

int main() {
    char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00};

    for (int i = 0; i < 8; i++) {
        for (int j = 0; j < 8; j++) {
            if (pattern[i] & (1 << (7 - j))) {
                printf("*");
            } else {
                printf(" ");
            }
        }
        printf("\n");
    }

    return 0;
}

#include <graphics.h>

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

    // 设置填充样式为斜线筛子图案，颜色为红色
    setfillstyle(SLASH_FILL, RED);

    // 在图形窗口中填充一个矩形
    rectangle(100, 100, 200, 200);
    floodfill(150, 150, getmaxcolor());

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

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

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

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

    x = getmaxx() / 2;
    y = getmaxy() / 2;

    settextjustify(CENTER_TEXT, CENTER_TEXT);
    outtextxy(x, y, "Press any key to exit graphics:");
    getch();

    // 将图形模式恢复到文本模式
    restorecrtmode();
    printf("We're now in text mode.\n");
    printf("Press any key to return to graphics mode:");
    getch();

    // 返回图形模式
    setgraphmode(getgraphmode());

    settextjustify(CENTER_TEXT, CENTER_TEXT);
    outtextxy(x, y, "We're back in graphics mode.");
    outtextxy(x, y+textheight("W"), "Press any key to halt:");

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

#include <stdio.h>
#include <setjmp.h>

jmp_buf buf;

void foo()
{
    printf("foo() before longjmp()\n");
    longjmp(buf, 1);
    printf("foo() after longjmp()\n");
}

int main()
{
    int ret = setjmp(buf);

    if (ret == 0) {
        printf("main() before foo()\n");
        foo();
    } else {
        printf("main() after longjmp()\n");
    }

    return 0;
}