从键盘输入三角形的三边长为a,b,c，按下面公式计算并输出三角形的面积。程序代码如下，但程序运行后输出结果不正确，请找出有问题的语句。#include#includeint main(){float a, b, c;float s, area;printf("Input a,b,c:");scanf("%f,%f,%f",&a,&b,&c);if (a+b>c && b+c>a && a+c>b){s = 1/2 * (a + b + c);area = sqrt(s * (s - a) * (s - b) * (s - c));printf("area=%.2f\n", area);}else{printf("It is not a triangle\n");}return 0;}