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#include <stdio.h>
#include <math.h>
 
float f(float W. tR)
{
	float N;
 
	N=5.54*pow(tR/W, 2);
 
	return N;
}
 
int main()
{
	float W, tR;
 
	scanf("%f, %f", &W, &tR);
	printf("%f", f(W, tR));
 
	return 0;
}

prog.cpp:4:16: error: expected ‘,’ or ‘...’ before ‘.’ token
 float f(float W. tR)
                ^
prog.cpp: In function ‘float f(float)’:
prog.cpp:8:13: error: ‘tR’ was not declared in this scope
  N=5.54*pow(tR/W, 2);
             ^~
prog.cpp: In function ‘int main()’:
prog.cpp:18:22: error: too many arguments to function ‘float f(float)’
  printf("%f", f(W, tR));
                      ^
prog.cpp:4:7: note: declared here
 float f(float W. tR)
       ^

Standard output is empty