c语言---练习题

#include <stdio.h>
int main()
{
    float math,chinese,physic,chemistry,sum;
    int select;
    math =138;
    chinese =59;
    physic =98;
    chemistry =100;

    scanf("%d",&select);
    if ( select==1)
    {
        printf("the math is:%f\n",math);
    }
    else if (select==2)
    {
        printf("the chinese is:%f\n",chinese);
    }
    else if (select==3)
    {
        printf("the physic is :%f\n",physic);
    }
    else if (select==4)
    {
        printf("the chemistry is:%f\n",chemistry);
    }
    else
    {
        printf("the sum   is:%f\n",sum);
    }
    return 0;
}