随机生成四则运算

package text1;

public class P1 {

public static void gs(Object obj){

System.out.println(obj);

}

public static void main(String[] args){

int count = 0;

for(int i=0;i<300;i++){

int a = (int)(Math.random()*100);

int b = (int)(Math.random()*100);

int c = (int)(Math.random()*100);

int j=1;

if(0<=c&&c<10)

j=1;

else if(10<=c&&c<20)

j=2;

else if(20<=c&&c<30)

j=3;

else if(30<=c&&c<40)

j=4;

else if(40<=c&&c<50)

j=5;

else if(50<=c&&c<60)

j=6;

else if(60<=c&&c<70)

j=7;

else if(70<=c&&c<80)

j=8;

else if(80<=c&&c<90)

j=9;

else

j=10;

switch(j){

case 1:

gs(a + "+" + b + "=");

break;

case 2:

gs(a + "-" + b + "=");

break;

case 3:

gs(a + "*" + b + "=");

break;

case 4:

gs(a + "/" + b + "=");

break;

}

count++;

}

gs("一共有："+count+"四则运算题目");

}

public static void jf(int a,int b){

if(a>=b)

gs(a + "-" + b + "=");

else{

gs(b + "-" + a + "=");

}

}

public static void cf(int a,int b){

if(b>0)

gs(a + "/" + b + "=");

else{

b=b+1;

gs(a + "/" + b + "=");

}

}

}