实验1 math2

#include<stdio.h>
int main(){

    float x,y;
    float r1,r2,r3,r4;

    x=1;
    y=2;

    r1=x+y;
    r2=x-y;
    r3=x*y;
    r4=x/y;

    printf("r1=%f\n",r1);
    printf("r2=%f\n",r2);
    printf("r3=%f\n",r3);
    printf("r4=%f\n",r4);

    return 0;
}

#include<stdio.h>
int main(){

    int x,y;
    int r1,r2,r3,r4;

    x=1;
    y=2;

    r1=x+y;
    r2=x-y;
    r3=x*y;
    r4=x/y;

    printf("r1=%d\n",r1);
    printf("r2=%d\n",r2);
    printf("r3=%d\n",r3);
    printf("r4=%d\n",r4);

    return 0;
}

关于r4的值，浮点数1/2可得小数，整型数据1/2时只能得到整数0