# include
double jia(double x, double d)
{
double s;
s = x+d;
return s;
}
double jian(double x, double d)
{
double s;
s = x-d;
return s;
}
double cheng(double x, double d)
{
double s;
s = x*d;
return s;
}
double chu(double x, double d)
{
double s;
s = x/d;
return s;
}
int main(void)
{
double i, j, k;
char t;
k = 0;
printf（＂请输入要计算什么运算“+”“-”“*”“/”n＂）;
scanf(＂%c＂, &t);
if(t == '+')
{
printf（＂请输入要相加的两个数n＂）;
scanf(＂%lf %lf＂, &i, &j);
k = jia(i, j);
printf（＂这两个数相加为%6.2lfn＂, k）;
}
else if(t == '-')
{
printf（＂请输入要相减的两个数n＂）;
scanf(＂%lf %lf＂, &i, &j);
k = jian(i, j);
printf（＂这两个数相减为%6.2lfn＂, k）;
}
else if(t == '*')
{
printf（＂请输入要相*的两个数n＂）;
scanf(＂%lf %lf＂, &i, &j);
k = cheng(i, j);
printf（＂这两个数相*为%6.2lfn＂, k）;
}
else if(t == '/')
{
printf（＂请输入要相/的两个数n＂）;
scanf(＂%lf %lf＂, &i, &j);
k = chu(i, j);
printf（＂这两个数相/为%6.2lfn＂, k）;
}
else
{
printf（＂对不起目前只支持“+”“-”“*”“/”n＂）;
}
return 0;
}
#include
#include
#include
#include
int main()
{
int type;
int left, right;
float result;
srand(unsigned(time(NULL)));
while(1)
{
type = rand() % 4;
left = rand() % 10;
right = rand() % 10;
switch(type)
{
case 0:
printf(＂%d + %d = ?n＂, left, right);
scanf(＂%f＂, &result);
if(left + right == result)
printf(＂right!n＂);
else
printf(＂wrong!The result is %dn＂, left + right);
break;
case 1:
printf(＂%d - %d = ?n＂, left, right);
scanf(＂%f＂, &result);
if(left - right == result)
printf(＂right!n＂);
else
printf(＂wrong!The result is %dn＂, left - right);
break;
case 2:
printf(＂%d * %d = ?n＂, left, right);
scanf(＂%f＂, &result);
if(left * right == result)
printf(＂right!n＂);
package Ex1; //Ex1为包名
import java.util.*;
public class SzYs { //SzYs为类名
public static void main(String[] args){
double num1;
double num2;
String fuHao;
Scanner input = new Scanner(System.in);
System.out.print（＂输入第一个数的值：＂）；
num1 = input.nextDouble();
System.out.print（＂输入第二个数的值：＂）；
num2 = input.nextDouble();
System.out.print（＂输入运算符号（+ - * \ ）＂）；
fuHao = input.next();
if(fuHao.equals(＂+＂)){
System.out.print(num1 + ＂与＂ + num2 + ＂的和是＂ + （num1+num2）);
}else if(fuHao.equals(＂-＂)){
System.out.print(num1 + ＂与＂ + num2 + ＂的差是＂ + （num1-num2）);
}else if(fuHao.equals(＂8＂)){
System.out.print(num1 + ＂与＂ + num2 + ＂的积是＂ + （num1*num2）);
}else if(fuHao.equals(＂\＂)){
if(num2==0){
System.out.print（＂除数不能为0＂）;
}else{
System.out.print(num1 + ＂与＂ + num2 + ＂的商是＂ + （num1/num2）);
}
}else{
System.out.print（＂不能辨认该符号＂）；
}
}
}
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