#include  <stdio.h>
int main(void)
{
    int    data1, data2;
    char  op;
    printf("Please enter an expression:");
    scanf("%d %c %d", &data1, &op, &data2);  /* 输入运算表达式 */
    switch(op)
    {
        case'+':
            printf("%d+%d=%d\n",data1,data2,data1+data2);
            break;
        case'-':
                    printf("%d-%d=%d\n",data1,data2,data1-data2);
                    break;
        case'*':
                    printf("%d*%d=%d\n",data1,data2,data1*data2);
                    break;
        case'/':
                    printf("%d/%d=%d\n",data1,data2,data1/data2);
                    break;                            
    }
    return 0;
}