c语言程序设计 输入三角形的3条边a,b,c,如果能构成三角形,输入面积cre...答:include <stdio.h> include <math.h> void main(void){ double a, b, c, S, p;int TRUE = 0;printf("Enter three numbers for sides of a triangle: ");scanf("%lf %lf %lf", &a, &b, &c);if((a + b > c) && (b + c > a) && (c + a > b)){ TRUE = 1;p...