哪位大佬帮忙看一下错了哪里？[face]monkey2:057.png[/face] #incl

哪位大佬帮忙看一下错了哪里？[face]monkey2:057.png[/face] #include int mian (viod) { int a,b; double r; printf("整数a和b的值:"); scanf("%d%d",&a,&b); printf("a+b=%d\n",a+b); printf("a-b=%d\n",a-b); printf("a*b=%d\n",a*b); printf("a/b=%d\n",a/b); printf("a%%b=%d\n",a%b); printf("(a+b)/2\n",(a+b)/2); printf("平均值=%f\n\n",(double)(a+b)/2); printf("半径:"); scanf("%1f",&r); printf("半径为%.3f的圆的面积是%.3f。\n",r,3.14*3.14*r); return 0; }

请使用代码控件提交代码。你的问题两个。main写成mian，还有，圆面积公式是r*PI*PI?

int main ()
{
    int a,b;
    double r;
    printf("整数a和b的值:");
    scanf("%d%d",&a,&b);
    printf("a+b=%d\n",a+b);
    printf("a-b=%d\n",a-b);
    printf("a*b=%d\n",a*b);
    printf("a/b=%d\n",a/b);
    printf("a%%b=%d\n",a%b);
    printf("(a+b)/2=%d\n",(a+b)/2);
    printf("平均值=%f\n\n",(double)(a+b)/2);
    printf("半径:");
    scanf("%lf",&r);
    printf("半径为%.3f的圆的面积是%.3f。\n",r,3.14*r*r);
    return 0;
}