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#include <stdio.h>
#include<math.h>
#include<locale.h>
 
int main(void)
{
	setlocale (LC_ALL,"russian");
	float x,y,a,b,c;
	printf ("введите границы A и B\n");
	scanf ("%f %f", &A,&B);
	printf ("введите шаг H\n");
	scanf ("%f", &h);
	x=a;
	while (x<=b)
	{
		if (x<-1) y=pow((x+1),4);
		else if (x<1) y=1-cos(3.14*x);
		else y=-pow((x-1),2);
		printf ("x=%.2f y=%.2f\n",x,y);
		x=x+h;
	}
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:10:19: error: ‘A’ undeclared (first use in this function)
  scanf ("%f %f", &A,&B);
                   ^
prog.c:10:19: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:22: error: ‘B’ undeclared (first use in this function)
  scanf ("%f %f", &A,&B);
                      ^
prog.c:12:16: error: ‘h’ undeclared (first use in this function)
  scanf ("%f", &h);
                ^
prog.c:8:16: warning: unused variable ‘c’ [-Wunused-variable]
  float x,y,a,b,c;
                ^

Standard output is empty