C :

#include<stdio.h>

int main()
{
	int a,b,c;
	a=1;
	b=2;
	c=a+b;
	printf("%d+%d=%d",a,b,c);
	return 0;
}

C++ :

#include<stdio.h>

int main()
{
	int a,b,c;
	a=1;
	b=2;
	c=a+b;
	printf("%d+%d=%d",a,b,c);
	return 0;
}

Pascal :

begin
  writeln('1+2=',1+2);
end.