php练习题

<!------------------九九乘法表--------------------><?php for($i=1;$i<=9;$i++){ ???for($j=1;$j<=$i;$j++){ ???echo $j.‘*‘.$i."=".$i*$j."&nbsp&nbsp"; ????} ???echo "<br>";} ???echo "<br>"; ???echo "<br>"; ???echo "<br>"; ???echo "<br>";?><!------------------过路费--------------------><?php $n=0;$m=100000;while($m>50000){$m*=0.95;$n++;}echo "<br>"; ???while($m>5000){ ???$m-=5000; ???$n++;}echo "总共经过".$n."次路口";echo "<br>"; ???echo "<br>"; ???echo "<br>"; ????><!------------------金字塔--------------------><?phpecho "第一种金字塔<br>"; ???$a=10;for($i=1;$i<=$a;$i++){for($j=1;$j<=$i;$j++){echo "*";}echo "<br>"; ???}echo "<br>"; ????><?phpecho "第二种金字塔<br>"; ???$a=10;for($i=1;$i<=$a;$i++){for($j=$a;$j>=$i;$j--){echo "*";}echo "<br>"; ???}echo "<br>"; ????><?phpecho "第三种金字塔<br>"; ???$a=5;for($i=1;$i<=$a;$i++){ ???for($j=$a;$j>$i;$j--){ ???????????echo"&nbsp;";} ???????for($k=1;$k<=2*$i-1;$k++){ ???????????????echo "*"; ???}echo "<br>"; ???}; ???echo "<br>"?><?phpecho "第四种金字塔<br>"; ???$a=5;for($i=$a;$i>0;$i--){ ???for($j=1;$j<=$a-$i;$j++){ ???????????echo"&nbsp;";} ???????for($k=1;$k<$i*2;$k++){ ???????????????echo "*"; ???}echo "<br>"; ???}; ???echo "<br>";?><!------------------百鸡--------------------><?php//公鸡最多20只，母鸡最多33，小鸡最多100；//公鸡5块，母鸡3块，小鸡1块3个for($g=1;$g<=20;$g++){ ???for($m=1;$m<=33;$m++){ ???????$x=(100-$m-$g); ???????if((5*$g)+(3*$m)+$x/3==100){ ???????echo "公鸡的数量为".$g."&nbsp;&nbsp;"; ???????echo "母鸡的数量为".$m."&nbsp;&nbsp;"; ???????echo "小鸡的数量为".$x."&nbsp;&nbsp;"; ???????echo "<br>";} ???????}}?><!------------------百鸡-------------------->