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<>sqrt()函数的用法,求三角形面积
今天刷题的时候看到了三角形面积,突然想到老师上课讲过,这不是好简单?
就直接上代码.
#include <stdio.h> int main() { float a = 0; float b = 0; float c = 0;//三角形的三条边
printf("输入三角形的三条边\n"); scanf("%f %f %f", &a, &b, &c); if (a + b > c && a + c > b
&& b + c > a) { float s = (a + b + c) / 2.0; float mianji = s * (s - a) * (s - b
) * (s - c);//三角形面积公 printf("三角形的面积为%.2f", mianji);//保留两位小数输出三角形面积 } else {
printf("三角形之和要大于第三边,请重新输入边长"); } return 0; }
然后怎么测试就是不过,就去找老师作业去看没问题啊!直到我找到了老师的PPT一看,???
然后我发现老师的题是三角形面积的平方,然后我拿笔一算尴尬了,敲代码没想那么多。我想在C语言怎么开平方,上网一找解决了。
那就是sqrt函数,sqrt函数需要#include<math.h>问题完美解决。代码如下
#include <stdio.h> #include <math.h>//用sqrt函数需要的头文件 int main() { float a = 0;
float b = 0; float c = 0;//三角形的三条边 printf("输入三角形的三条边\n"); scanf("%f %f %f", &a,
&b, &c); if (a + b > c && a + c > b && b + c > a) { float s = (a + b + c) / 2.0;
float mianji = sqrt(s * (s - a) * (s - b) * (s - c));//三角形面积公,sqrt()函数用来开平方根
printf("三角形的面积为%.2f", mianji);//保留两位小数输出三角形面积 } else { printf(
"三角形之和要大于第三边,请重新输入边长"); } return 0; }
两个小改动就行了,有点小尴尬。