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> 1</span> <span>$money</span> = 100000<span>;
</span><span> 2</span> <span>$i</span> = 0<span>;
</span><span> 3</span> <span>while</span>(<span>$money</span> >= 5000<span>) {
</span><span> 4</span> <span>if</span>( <span>$money</span> > 50000<span>) {
</span><span> 5</span> <span>$money</span> *= 95/100<span>;
</span><span> 6</span> } <span>else</span> <span>if</span>( <span>$money</span> <= 50000<span>) {
</span><span> 7</span> <span>$money</span> -= 5000<span>;
</span><span> 8</span> <span> }
</span><span> 9</span> <span>$i</span>++<span>;
</span><span>10</span> <span>}
</span><span>11</span> <span>echo</span> '可以经过' . <span>$i</span> . '次路口<br/>';
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程序7.
题目： 打印九九乘法表
<span>1</span> <span>for</span>(<span>$i</span> = 1; <span>$i</span> < 10; <span>$i</span>++<span>) {
</span><span>2</span> <span>for</span>(<span>$j</span> = 1; <span>$j</span> <= <span>$i</span>; <span>$j</span>++<span>) {
</span><span>3</span> <span>echo</span> <span>$j</span> . 'x' . <span>$i</span> . '=' . <span>$i</span>*<span>$j</span> . ' '<span>;
</span><span>4</span> <span> }
</span><span>5</span> <span>echo</span> '<br/>'<span>;
</span><span>6</span> }
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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> 1</span> <span>$x1</span> = 0; <span>//</span><span>公鸡个数</span>
<span> 2</span> <span>$x2</span> = 0; <span>//</span><span>母鸡个数</span>
<span> 3</span> <span>$x3</span> = 0; <span>//</span><span>小鸡个数</span>
<span> 4</span> <span>for</span>( <span>$x1</span> = 1; <span>$x1</span> <= 20; <span>$x1</span>++<span>) {
</span><span> 5</span> <span>for</span>( <span>$x2</span> = 1; <span>$x2</span> <= (33-<span>$x1</span>); <span>$x2</span>++<span>) {
</span><span> 6</span> <span>$x3</span> = 100 - <span>$x1</span> - <span>$x2</span><span>;
</span><span> 7</span> <span>if</span>( 100 == (<span>$x1</span>*5 + <span>$x2</span>*3 + <span>$x3</span>/3<span>) ) {
</span><span> 8</span> <span>echo</span> '公鸡个数为：' . <span>$x1</span> . '母鸡个数为：' . <span>$x2</span> . '小鸡个数为' . <span>$x3</span> . '<br/>'<span>;
</span><span> 9</span> <span> }
</span><span>10</span> <span> }
</span><span>11</span> }
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程序9.
题目： 求1到100内的素数
<span> 1</span> <span>$num</span> = 2<span>;
</span><span> 2</span> <span>while</span>(<span>$num</span> <= 100<span>) {
</span><span> 3</span> <span>if</span>( <span>$num</span> <= 3<span>) {
</span><span> 4</span> <span>echo</span> <span>$num</span> . ' '<span>;
</span><span> 5</span> } <span>else</span><span> {
</span><span> 6</span> <span>for</span>( <span>$j</span> = 2; <span>$j</span> <= <span>$num</span>; <span>$j</span>++<span>) {
</span><span> 7</span> <span>if</span>( <span>$j</span> == <span>$num</span><span> ) {
</span><span> 8</span> <span>echo</span> <span>$num</span> . ' '<span>;
</span><span> 9</span> } <span>else</span> <span>if</span>( <span>$num</span>%<span>$j</span> == 0<span>) {
</span><span>10</span> <span>break</span><span>;
</span><span>11</span> <span> }
</span><span>12</span> <span> }
</span><span>13</span> <span> }
</span><span>14</span> <span>$num</span>++<span>;
</span><span>15</span> }
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