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c语言基本的应用便于初学者学习使用 简单易懂

        { <br>
        &nbsp;&nbsp; textmode(BW40); <br>
        &nbsp;&nbsp; cprintf(&quot;ABC&quot;); <br>
        &nbsp;&nbsp; getch(); </p>
        <p>&nbsp;&nbsp; textmode(C40); <br>
        &nbsp;&nbsp; cprintf(&quot;ABC&quot;); <br>
        &nbsp;&nbsp; getch(); </p>
        <p>&nbsp;&nbsp; textmode(BW80); <br>
        &nbsp;&nbsp; cprintf(&quot;ABC&quot;); <br>
        &nbsp;&nbsp; getch(); </p>
        <p>&nbsp;&nbsp; textmode(C80); <br>
        &nbsp;&nbsp; cprintf(&quot;ABC&quot;); <br>
        &nbsp;&nbsp; getch(); </p>
        <p>&nbsp;&nbsp; textmode(MONO); <br>
        &nbsp;&nbsp; cprintf(&quot;ABC&quot;); <br>
        &nbsp;&nbsp; getch(); </p>
        <p>&nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: textwidth <br>
        功&nbsp; 能: 返回以像素为单位的字符串宽度
        <br>
        用&nbsp; 法: int far textwidth(char far *textstring); <br>
        程序例: </p>
        <p>#include &lt;graphics.h&gt; <br>
        #include &lt;stdlib.h&gt; <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;conio.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; /* request auto detection */ <br>
        &nbsp;&nbsp; int gdriver = DETECT, gmode, errorcode; <br>
        &nbsp;&nbsp; int x = 0, y = 0; <br>
        &nbsp;&nbsp; int i; <br>
        &nbsp;&nbsp; char msg[80]; </p>
        <p>&nbsp;&nbsp; /* initialize graphics and local
        variables */ <br>
        &nbsp;&nbsp; initgraph(&amp;gdriver, &amp;gmode,
        &quot;&quot;); </p>
        <p>&nbsp;&nbsp; /* read result of initialization */ <br>
        &nbsp;&nbsp; errorcode = graphresult(); <br>
        &nbsp;&nbsp; if (errorcode != grOk)&nbsp; /* an error
        occurred */ <br>
        &nbsp;&nbsp; { <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf(&quot;Graphics
        error: %s\n&quot;, grapherrormsg(errorcode)); <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf(&quot;Press any key
        to halt:&quot;); <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; getch(); <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1); /* terminate with
        an error code */ <br>
        &nbsp;&nbsp; } </p>
        <p>&nbsp;&nbsp; y = getmaxy() / 2; </p>
        <p>&nbsp;&nbsp; settextjustify(LEFT_TEXT, CENTER_TEXT); <br>
        &nbsp;&nbsp; for (i=1; i&lt;11; i++) <br>
        &nbsp;&nbsp; { <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* select the text style,
        direction, and size */ <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; settextstyle(TRIPLEX_FONT,
        HORIZ_DIR, i); </p>
        <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* create a message
        string */ <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sprintf(msg, &quot;Size:
        %d&quot;, i); </p>
        <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* output the message
        */ <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; outtextxy(x, y, msg); </p>
        <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /* advance to the end
        of the text */ <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; x += textwidth(msg); <br>
        &nbsp;&nbsp; } </p>
        <p>&nbsp;&nbsp; /* clean up */ <br>
        &nbsp;&nbsp; getch(); <br>
        &nbsp;&nbsp; closegraph(); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: time <br>
        功&nbsp; 能: 取一天的时间 <br>
        用&nbsp; 法: logn time(long *tloc); <br>
        程序例: </p>
        <p>#include &lt;time.h&gt; <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;dos.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; time_t t; </p>
        <p>&nbsp;&nbsp; t = time(NULL); <br>
        &nbsp;&nbsp; printf(&quot;The number of seconds since
        January 1, 1970 is %ld&quot;,t); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: tmpfile <br>
        功&nbsp; 能: 以二进制方式打开暂存文件 <br>
        用&nbsp; 法: FILE *tmpfile(void); <br>
        程序例: </p>
        <p>#include &lt;stdio.h&gt; <br>
        #include &lt;process.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; FILE *tempfp; </p>
        <p>&nbsp;&nbsp; tempfp = tmpfile(); <br>
        &nbsp;&nbsp; if (tempfp) <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf(&quot;Temporary
        file created\n&quot;); <br>
        &nbsp;&nbsp; else <br>
        &nbsp;&nbsp; { <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf(&quot;Unable to
        create temporary file\n&quot;); <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1); <br>
        &nbsp;&nbsp; } </p>
        <p>&nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: tmpnam <br>
        功&nbsp; 能: 创建一个唯一的文件名 <br>
        用&nbsp; 法: char *tmpnam(char *sptr); <br>
        程序例: </p>
        <p>#include &lt;stdio.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; char name[13]; </p>
        <p>&nbsp;&nbsp; tmpnam(name); <br>
        &nbsp;&nbsp; printf(&quot;Temporary name: %s\n&quot;,
        name); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: tolower <br>
        功&nbsp; 能: 把字符转换成小写字母 <br>
        用&nbsp; 法: int tolower(int c); <br>
        程序例: </p>
        <p>#include &lt;string.h&gt; <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;ctype.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; int length, i; <br>
        &nbsp;&nbsp; char *string = &quot;THIS IS A STRING&quot;;
        </p>
        <p>&nbsp;&nbsp; length = strlen(string); <br>
        &nbsp;&nbsp; for (i=0; i&lt;length; i++) <br>
        &nbsp;&nbsp; { <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; string[i] =
        tolower(string[i]); <br>
        &nbsp;&nbsp; } <br>
        &nbsp;&nbsp; printf(&quot;%s\n&quot;,string); </p>
        <p>&nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: toupper <br>
        功&nbsp; 能: 把字符转换成大写字母 <br>
        用&nbsp; 法: int toupper(int c); <br>
        程序例: </p>
        <p>#include &lt;string.h&gt; <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;ctype.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; int length, i; <br>
        &nbsp;&nbsp; char *string = &quot;this is a string&quot;;
        </p>
        <p>&nbsp;&nbsp; length = strlen(string); <br>
        &nbsp;&nbsp; for (i=0; i&lt;length; i++) <br>
        &nbsp;&nbsp; { <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; string[i] =
        toupper(string[i]); <br>
        &nbsp;&nbsp; } </p>
        <p>&nbsp;&nbsp; printf(&quot;%s\n&quot;,string); </p>
        <p>&nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: tzset <br>
        功&nbsp; 能: UNIX时间兼容函数 <br>
        用&nbsp; 法: void tzset(void); <br>
        程序例: </p>
        <p>#include &lt;time.h&gt; <br>
        #include &lt;stdlib.h&gt; <br>
        #include &lt;stdio.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; time_t td; </p>
        <p>&nbsp;&nbsp; putenv(&quot;TZ=PST8PDT&quot;); <br>
        &nbsp;&nbsp; tzset(); <br>
        &nbsp;&nbsp; time(&amp;td); <br>
        &nbsp;&nbsp; printf(&quot;Current time = %s\n&quot;,
        asctime(localtime(&amp;td))); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; </p>
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