自动出题四则运算

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 + "=");

}

}

}