PHP练习题(二)
程序6.
题目： 假设某人有100,000现金，每经过一次路口需要进行一次交费交费规则为当他现金大于50,000时每次需要交%5,如果现金小于等于50,000时每次交5,000.问此人可以经过多少次这个路口。
<span style="color: #008080;"> 1</span> <span style="color: #800080;">$money</span> = 100000<span style="color: #000000;">;</span><span style="color: #008080;"> 2</span> <span style="color: #800080;">$i</span> = 0<span style="color: #000000;">;</span><span style="color: #008080;"> 3</span> <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$money</span> >= 5000<span style="color: #000000;">) {</span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">if</span>( <span style="color: #800080;">$money</span> > 50000<span style="color: #000000;">) {</span><span style="color: #008080;"> 5</span> <span style="color: #800080;">$money</span> *= 95/100<span style="color: #000000;">;</span><span style="color: #008080;"> 6</span> } <span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span>( <span style="color: #800080;">$money</span> ) {<span style="color: #008080;"> 7</span> <span style="color: #800080;">$money</span> -= 5000<span style="color: #000000;">;</span><span style="color: #008080;"> 8</span> <span style="color: #000000;"> }</span><span style="color: #008080;"> 9</span> <span style="color: #800080;">$i</span>++<span style="color: #000000;">;</span><span style="color: #008080;">10</span> <span style="color: #000000;">}</span><span style="color: #008080;">11</span> <span style="color: #0000ff;">echo</span> '可以经过' . <span style="color: #800080;">$i</span> . '次路口<br>';
程序7.
题目： 打印九九乘法表
<span style="color: #008080;">1</span> <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span> = 1; <span style="color: #800080;">$i</span> $i++<span style="color: #000000;">) {</span><span style="color: #008080;">2</span> <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$j</span> = 1; <span style="color: #800080;">$j</span> $i; <span style="color: #800080;">$j</span>++<span style="color: #000000;">) {</span><span style="color: #008080;">3</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$j</span> . 'x' . <span style="color: #800080;">$i</span> . '=' . <span style="color: #800080;">$i</span>*<span style="color: #800080;">$j</span> . ' '<span style="color: #000000;">;</span><span style="color: #008080;">4</span> <span style="color: #000000;"> }</span><span style="color: #008080;">5</span> <span style="color: #0000ff;">echo</span> '<br>'<span style="color: #000000;">;</span><span style="color: #008080;">6</span> }
程序8.
题目： 百钱百鸡, 公鸡5文钱一只，母鸡3文钱一只，小鸡1文钱三只，用100文钱买100只， 问，公鸡，母鸡，小鸡各几只？
<span style="color: #008080;"> 1</span> <span style="color: #800080;">$x1</span> = 0; <span style="color: #008000;">//</span><span style="color: #008000;">公鸡个数</span><span style="color: #008080;"> 2</span> <span style="color: #800080;">$x2</span> = 0; <span style="color: #008000;">//</span><span style="color: #008000;">母鸡个数</span><span style="color: #008080;"> 3</span> <span style="color: #800080;">$x3</span> = 0; <span style="color: #008000;">//</span><span style="color: #008000;">小鸡个数</span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">for</span>( <span style="color: #800080;">$x1</span> = 1; <span style="color: #800080;">$x1</span> $x1++<span style="color: #000000;">) {</span><span style="color: #008080;"> 5</span> <span style="color: #0000ff;">for</span>( <span style="color: #800080;">$x2</span> = 1; <span style="color: #800080;">$x2</span> $x1); <span style="color: #800080;">$x2</span>++<span style="color: #000000;">) {</span><span style="color: #008080;"> 6</span> <span style="color: #800080;">$x3</span> = 100 - <span style="color: #800080;">$x1</span> - <span style="color: #800080;">$x2</span><span style="color: #000000;">;</span><span style="color: #008080;"> 7</span> <span style="color: #0000ff;">if</span>( 100 == (<span style="color: #800080;">$x1</span>*5 + <span style="color: #800080;">$x2</span>*3 + <span style="color: #800080;">$x3</span>/3<span style="color: #000000;">) ) {</span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">echo</span> '公鸡个数为：' . <span style="color: #800080;">$x1</span> . '母鸡个数为：' . <span style="color: #800080;">$x2</span> . '小鸡个数为' . <span style="color: #800080;">$x3</span> . '<br>'<span style="color: #000000;">;</span><span style="color: #008080;"> 9</span> <span style="color: #000000;"> }</span><span style="color: #008080;">10</span> <span style="color: #000000;"> }</span><span style="color: #008080;">11</span> }
程序9.
题目： 求1到100内的素数
<span style="color: #008080;"> 1</span> <span style="color: #800080;">$num</span> = 2<span style="color: #000000;">;</span><span style="color: #008080;"> 2</span> <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$num</span> ) {<span style="color: #008080;"> 3</span> <span style="color: #0000ff;">if</span>( <span style="color: #800080;">$num</span> ) {<span style="color: #008080;"> 4</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$num</span> . ' '<span style="color: #000000;">;</span><span style="color: #008080;"> 5</span> } <span style="color: #0000ff;">else</span><span style="color: #000000;"> {</span><span style="color: #008080;"> 6</span> <span style="color: #0000ff;">for</span>( <span style="color: #800080;">$j</span> = 2; <span style="color: #800080;">$j</span> $num; <span style="color: #800080;">$j</span>++<span style="color: #000000;">) {</span><span style="color: #008080;"> 7</span> <span style="color: #0000ff;">if</span>( <span style="color: #800080;">$j</span> == <span style="color: #800080;">$num</span><span style="color: #000000;"> ) {</span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$num</span> . ' '<span style="color: #000000;">;</span><span style="color: #008080;"> 9</span> } <span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span>( <span style="color: #800080;">$num</span>%<span style="color: #800080;">$j</span> == 0<span style="color: #000000;">) {</span><span style="color: #008080;">10</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">;</span><span style="color: #008080;">11</span> <span style="color: #000000;"> }</span><span style="color: #008080;">12</span> <span style="color: #000000;"> }</span><span style="color: #008080;">13</span> <span style="color: #000000;"> }</span><span style="color: #008080;">14</span> <span style="color: #800080;">$num</span>++<span style="color: #000000;">;</span><span style="color: #008080;">15</span> }
