「Cでグラフ！」の編集履歴（バックアップ）一覧はこちら

「Cでグラフ！」(2010/12/14 (火) 22:07:13) の最新版変更点

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#include <stdio.h>
#include <math.h>

/* 任意の関数のグラフ */

double fun(double x)
{
   double y;
   y = sin(x);
   return y;
}
int main(void){
   double  x, y;
   double  xfrom, xto;
   int	   xsteps;
   double  yfrom, yto;
   int     xidx, yidx;
   printf("*********\n");
   printf("y=sin(x)\nx[rad]\n");
   printf("*********\n");
   printf("x: from to steps> ");
   scanf( "%lf %lf %d", &xfrom, &xto, &xsteps );
   printf("y: from to     > ");
   scanf( "%lf %lf", &yfrom, &yto );
   
   for(xidx=0;xidx<=xsteps;xidx++){
      
      x = xfrom + (xto-xfrom)/xsteps*xidx;
      y = fun(x);
      printf("%8.3lf: ",x);

      if ((y<yfrom)||(y>yto)){
	  printf( "\n" );
      }else{
	  yidx = (y-yfrom)*50/(yto-yfrom)+0.5;
	  while(yidx--){printf( " " );}
	  printf("*\n");
      }
   }
   return 0;
}

#include <stdio.h>
#include <math.h>

/* 任意の関数のグラフ */

double fun(double x)
{
   double y;
   y = sin(x);
   return y;
}
int main(void){
   double  x, y;
   double  xfrom, xto;
   int	   xsteps;
   double  yfrom, yto;
   int     xidx, yidx;
   printf("*********\n");
   printf("y=sin(x)\nx[rad]\n");
   printf("*********\n");
   printf("x: from to steps> ");
   scanf( "%lf %lf %d", &xfrom, &xto, &xsteps );
   printf("y: from to     > ");
   scanf( "%lf %lf", &yfrom, &yto );
   
   for(xidx=0;xidx<=xsteps;xidx++){
      
      x = xfrom + (xto-xfrom)/xsteps*xidx;
      y = fun(x);
      printf("%8.3lf: ",x);

      if ((y<yfrom)||(y>yto)){
	  printf( "\n" );
      }else{
	  yidx = (y-yfrom)*50/(yto-yfrom)+0.5;
	  while(yidx--){printf( " " );}
	  printf("*\n");
      }
   }
   return 0;
}




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