main() { float x,y; scanf(%f,&x); if(x>=0) y=x; else y=-x; printf(%f\n,y); } 中scanf(%f,&x); 是什么

#include main() { float x,y; scanf(%f,&x); if(x #include void main( ) { float x,y; scanf(%f,&x); if(x #include void main( ) { float x,y; scanf(%f,&x); if(x #include #include main() { int x,y; float m; for(x=0;x 这道题哪里出错了,main() { int x; float y; scanf (%d,x); if (x C语言题,求详解Main(){float x =2.0,y;if(x C语言：下面的功能是计算函数F（x,y,z）=（x+y）*（x+y）+（x+y）*（x-y）的值并输出.float f（float,float）；main（）{float x,y,z,sum；scanf（%f%f%f,&x&y&z）;sum=_____________;printf(sum=%f' ,sum);}float f(float a, c语言的问题,求x^3-5x^2+16x-80的根,我用的弦截法,但是出错#include#includefloat f(float x){float y;y=x*(x*x-5*x+16)-80;return y;}float xpoint(float x1,float x2){float root;root=(f(x2)*x1-x2*f(x1))/(f(x2)-f(x1));return root;}void main() 编写由三角形三边求面积的函数.#includefloat kig(float x, float y,float z);main(){ float s,a,b,c; scanf(%f%f%f,&a,&b,&c); s=kig(a,b,c); printf(s=%f ,kig(a,b,c));}float kig(float x,float y,float z){ float p; p=1/4*(2*x*z+y*y-x*x-z*z); 拉格朗日插值函数程序如下,divided by o 那地方错了啊,#include #include #include float loggerangri(int n,float *x,float *f,float X);void main() {int i;int m;float x[20];float y[20];float X,Px;printf( 请输入插值次数N );scanf( 设计程序将分段函数表达出来void main(){float x,y;prinft(enter x:);scanf(%f,&x);if(x c语言找错误#include #include #includefloat area (float a,float b,float c){float area,p;p=(a+b+c)/2;area=sqrt(p*(p-a)*(p-b)*(p-c));return area;}main(){float x,y,z,ts;scanf(%d%d%d,&x,&y,&z);if(((x+y)>z)&&((y+z)>x)){ts=area(x,y,z);/*或者用scan 请问 以下C/C++程序的具体意思是?#include #include void fft(float *xr, float *xi, int nr, float T);void main ( ){ float p[512],x[512],y[512]; int i,j; FILE *fp1,*fp2,*fp3; ////void fft(float *xr, float *xi, int nr, float T){ int main() { float x,y; scanf(%f,&x); if(x>=0) y=x; else y=-x; printf(%f ,y); } 中scanf(%f,&x); 是什么 #include #include int main(void) { float a,b,c,x,y,z; printf(please input a,b and C语言判断点是否在三角形内或外#include#includestruct point{double x;double y;};int area(float m,float n,float t){float p,S;p=(m+n+t)/2;S=sqrt(p*(p-m)*(p-n)*(p-t));return S;}void main(){point a,b,c,d,p;float AB,BC,AC;float S0,S1,S2,S3;sca #include void main() { float x=5/2,y=5.0/2; printf(x=%f,y=%f ,x,y); }求解释： 下面的程序存在语法错误,请指出并予以修改#includeviod main ( ){ float x,y; //1if (x>0); //2x=x+y; //3cout