#include <stdio.h>

int main() {
    system("cls");
    int a,b;
    float res;
    char dau;
    printf("Nhap bieu thuc: ");
    scanf("%d %c %d",&a, &dau, &b);
    switch(dau){
        case '+':
            res = a + b;
            break;
        case '-':
            res = a - b;
            break;
        case '*':
            res = a * b;
            break;
        case '/':
            res = a / b;
            break;
        default:
            printf("khong co phep toan %d %c %d",a,dau,b);
            return(0);
            break;
    }
    printf("%d %c %d = %.2f",a, dau, b, res);
    return(0);
}