#include

#include

intmain()

{

inti,num1,num2,sum,count;

charch,op;

printf("123+-\n");

printf("456*/\n");

printf("789=#\n\n");

{

printf("0");

ch=getch();

while(ch"9")//輸入的不是數字，重新輸入

ch=getch();

printf("\b%c",ch);

count=1;

num1=ch-"0";

while(ch=getch(),ch>="0"&&ch

{

putchar(ch);

num1=num1*10+ch-"0";

count++;

}

while(1)

{

op=ch;//符號

ch=getch();

while(ch"9")//輸入的不是數字，重新輸入

ch=getch();

for(i=0;i