读入三个双精度数,求它们的平均值并保留此平均值小数后一位数,

对小数点后第二位数进行四舍五入,最后输出结果.

#include "stdio.h"
int main() {
double a,b,c;
printf("in put a: ");
scanf("%lf",&a);
printf("in put b: ");
scanf("%lf",&b);
printf("in put c: ");
scanf("%lf",&c);
double avg=(a+b+c)/3;
avg=(double)((int)(avg*10+0.5))/10;
printf("the avg is: %g\n",avg);
return 0;
}

#include "stdio.h" double ave(double a,double b,double c) { return (a+b+c)/3; } void main() { double a,b,c; printf("input a ,b ,c=?\n"); scanf("%lf%lf%lf",&a,&b,&c); printf("the average is %.1lf",ave(a,b,c)); }