#include <math.h>
#include <stdio.h>
main()
{
float num1,num2,result;
char fuhao,answer;
int right;
clrscr();/*清平*/
printf("*********welcome to lin er ming's system*********");
printf("\n");
do
{
printf("please enter num1,fuhao,num2:");
scanf("%f,%c,%f",&num1,&fuhao,&num2);/*可以修改输入,会更好*/
/*scanf("%c",&fuhao);
scanf("%f",&num2);*//*可以修改输入,会更好*/
printf("please enter your answer:");
scanf("%f",&result);
switch(fuhao)
{
case '+':if(result==(num1+num2)) right=1;
else
right=0;
break;
case '-':if(result==(num1-num2)) right=1;
else
right=0;
break;
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