int main()
{
printf("Please input number\n");
char input[5];
int i;
int j;
scanf("%s", &input);
scanf("%d", &i);
scanf("%d", &j);
int sum = 0;
int num = 0;
if (strcmp("-a", input)==0)
num = 1;
if (strcmp("-b", input)==0)
num = 2;
if (strcmp("-c", input)==0)
num = 3;
switch (num)
{
case 1:
{
sum = i + j;
break;
}
case 2:
{
sum = i - j;
break;
}
case 3:
{
sum = i / j;
break;
}
}
printf("%d\n",sum);
system("pause");
}