The C Programming language Chapter 4 Input and Output ◆44 EXamples Is=2(a+b+c) 例输入三角形边长,求面积 area=√s×(s-a)x(s-b)×(s-c /*ch312.c*/ #include <math. h> File Inclusion #include <stdio.h> main( i float a, b, c, s,area Declarations W scanf("%f, %f, %f", &a, &b, &c) Data input S=1.0/2*(a+b+c); area=sqrt(s*(s-a)(s-b)"(S-c)) Data output printf("a-%7.2f,b=%7.2f,c-%7.2f,s%7.2fn",a,b,c,s) printf("area=%7.2fn", area) 输入:3.4.6 输出:a=3.00.b=4.00.c=6.00s=6.50 area= 5.33The C Programming Language Chapter 4 Input and Output  4.4 Examples /*ch3_12.c*/ #include <math.h> #include <stdio.h> main() { float a,b,c,s,area; scanf("%f,%f,%f",&a,&b,&c); s=1.0/2*(a+b+c); area=sqrt(s*(s-a)*(s-b)*(s-c)); printf("a=%7.2f, b=%7.2f, c=%7.2f, s=%7.2f\n",a,b,c,s); printf("area=%7.2f\n",area); } 例 输入三角形边长，求面积 输入：3,4,6  输出：a= 3.00, b= 4.00, c= 6.00 s= 6.50 area= 5.33 File Inclusion Declarations Data input Data output