#include <stdio.h>
void main( )
{   
    float a,b,sum,average;   /*定义变量*/
    scanf("%f,%f", &a, &b);     /*输入两个实型数*/
    sum = a + b;                /*求两个数的和*/
    average = (a + b) / 2;      /*求两个数的平均值*/
    printf("sum=%f,average=%f\n", sum, average); /* 输出结果 */
    getch();
}