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各种各样的源代码

        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; struct tm t; <br>
        &nbsp;&nbsp; char str[80]; </p>
        <p>&nbsp;&nbsp; /* sample loading of tm structure&nbsp;
        */ </p>
        <p>&nbsp;&nbsp; t.tm_sec&nbsp;&nbsp;&nbsp; = 1;&nbsp; /*
        Seconds */ <br>
        &nbsp;&nbsp; t.tm_min&nbsp;&nbsp;&nbsp; = 30; /* Minutes
        */ <br>
        &nbsp;&nbsp; t.tm_hour&nbsp;&nbsp; = 9;&nbsp; /* Hour */ <br>
        &nbsp;&nbsp; t.tm_mday&nbsp;&nbsp; = 22; /* Day of the
        Month&nbsp; */ <br>
        &nbsp;&nbsp; t.tm_mon&nbsp;&nbsp;&nbsp; = 11; /* Month */
        <br>
        &nbsp;&nbsp; t.tm_year&nbsp;&nbsp; = 56; /* Year - does
        not include century */ <br>
        &nbsp;&nbsp; t.tm_wday&nbsp;&nbsp; = 4;&nbsp; /* Day of
        the week&nbsp; */ <br>
        &nbsp;&nbsp; t.tm_yday&nbsp;&nbsp; = 0;&nbsp; /* Does not
        show in asctime&nbsp; */ <br>
        &nbsp;&nbsp; t.tm_isdst&nbsp; = 0;&nbsp; /* Is Daylight
        SavTime; does not show in asctime */ </p>
        <p>&nbsp;&nbsp; /* converts structure to null terminated <br>
        &nbsp;&nbsp; string */ </p>
        <p>&nbsp;&nbsp; strcpy(str, asctime(&amp;t)); <br>
        &nbsp;&nbsp; printf(&quot;%s\n&quot;, str); </p>
        <p>&nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: asin <br>
        功&nbsp; 能: 反正弦函数 <br>
        用&nbsp; 法: double asin(double x); <br>
        程序例: <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;math.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; double result; <br>
        &nbsp;&nbsp; double x = 0.5; </p>
        <p>&nbsp;&nbsp; result = asin(x); <br>
        &nbsp;&nbsp; printf(&quot;The arc sin of %lf is
        %lf\n&quot;, x, result); <br>
        &nbsp;&nbsp; return(0); <br>
        } <br>
        &nbsp; <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: assert <br>
        功&nbsp; 能: 测试一个条件并可能使程序终止
        <br>
        用&nbsp; 法: void assert(int test); <br>
        程序例: <br>
        #include &lt;assert.h&gt; <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;stdlib.h&gt; </p>
        <p>struct ITEM { <br>
        &nbsp;&nbsp; int key; <br>
        &nbsp;&nbsp; int value; <br>
        }; </p>
        <p>/* add item to list, make sure list is not null */ <br>
        void additem(struct ITEM *itemptr) { <br>
        &nbsp;&nbsp; assert(itemptr != NULL); <br>
        &nbsp;&nbsp; /* add item to list */ <br>
        } </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; additem(NULL); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: atan <br>
        功&nbsp; 能: 反正切函数 <br>
        用&nbsp; 法: double atan(double x); <br>
        程序例: <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;math.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; double result; <br>
        &nbsp;&nbsp; double x = 0.5; </p>
        <p>&nbsp;&nbsp; result = atan(x); <br>
        &nbsp;&nbsp; printf(&quot;The arc tangent of %lf is
        %lf\n&quot;, x, result); <br>
        &nbsp;&nbsp; return(0); <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: atan2 <br>
        功&nbsp; 能: 计算Y/X的反正切值 <br>
        用&nbsp; 法: double atan2(double y, double x); <br>
        程序例: <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;math.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; double result; <br>
        &nbsp;&nbsp; double x = 90.0, y = 45.0; </p>
        <p>&nbsp;&nbsp; result = atan2(y, x); <br>
        &nbsp;&nbsp; printf(&quot;The arc tangent ratio of %lf is
        %lf\n&quot;, (y / x), result); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: atexit <br>
        功&nbsp; 能: 注册终止函数 <br>
        用&nbsp; 法: int atexit(atexit_t func); <br>
        程序例: <br>
        #include &lt;stdio.h&gt; <br>
        #include &lt;stdlib.h&gt; </p>
        <p>void exit_fn1(void) <br>
        { <br>
        &nbsp;&nbsp; printf(&quot;Exit function #1
        called\n&quot;); <br>
        } </p>
        <p>void exit_fn2(void) <br>
        { <br>
        &nbsp;&nbsp; printf(&quot;Exit function #2
        called\n&quot;); <br>
        } </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; /* post exit function #1 */ <br>
        &nbsp;&nbsp; atexit(exit_fn1); <br>
        &nbsp;&nbsp; /* post exit function #2 */ <br>
        &nbsp;&nbsp; atexit(exit_fn2); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: atof <br>
        功&nbsp; 能: 把字符串转换成浮点数 <br>
        用&nbsp; 法: double atof(const char *nptr); <br>
        程序例: <br>
        #include &lt;stdlib.h&gt; <br>
        #include &lt;stdio.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; float f; <br>
        &nbsp;&nbsp; char *str = &quot;12345.67&quot;; </p>
        <p>&nbsp;&nbsp; f = atof(str); <br>
        &nbsp;&nbsp; printf(&quot;string = %s float = %f\n&quot;,
        str, f); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: atoi <br>
        功&nbsp; 能: 把字符串转换成长整型数 <br>
        用&nbsp; 法: int atoi(const char *nptr); <br>
        程序例: <br>
        #include &lt;stdlib.h&gt; <br>
        #include &lt;stdio.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; int n; <br>
        &nbsp;&nbsp; char *str = &quot;12345.67&quot;; </p>
        <p>&nbsp;&nbsp; n = atoi(str); <br>
        &nbsp;&nbsp; printf(&quot;string = %s integer =
        %d\n&quot;, str, n); <br>
        &nbsp;&nbsp; return 0; <br>
        } <br>
        &nbsp; <br>
        &nbsp; </p>
        <p>函数名: atol <br>
        功&nbsp; 能: 把字符串转换成长整型数 <br>
        用&nbsp; 法: long atol(const char *nptr); <br>
        程序例: </p>
        <p>#include &lt;stdlib.h&gt; <br>
        #include &lt;stdio.h&gt; </p>
        <p>int main(void) <br>
        { <br>
        &nbsp;&nbsp; long l; <br>
        &nbsp;&nbsp; char *str = &quot;98765432&quot;; </p>
        <p>&nbsp;&nbsp; l = atol(lstr); <br>
        &nbsp;&nbsp; printf(&quot;string = %s integer =
        %ld\n&quot;, str, l); <br>
        &nbsp;&nbsp; return(0); <br>
        } <br>
        &nbsp; </p>
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