C :

#include<stdio.h>

int main()
{
	float a,b,c;
	a=5.1;
	b=3.4;
	c=a+b;
	printf("%.1f+%.1f=%.1f\n",a,b,c);
	return 0;
}

C++ :

#include<stdio.h>

int main()
{
	float a,b,c;
	a=5.1;
	b=3.4;
	c=a+b;
	printf("%.1f+%.1f=%.1f",a,b,c);
	return 0;
}

Pascal :

begin
  writeln('5.1+3.4=8.5');
end.