C :

#include<stdio.h>

int main()
{
	int a,b,c,d;
	a=10;
	b=5;
	c=15;
	printf("%d+%d=%d\n",a,b,c);
	printf("%d-%d=%d\n",a,b,b);
	return 0;
}

C++ :

#include<stdio.h>

int main()
{
	int a,b,c;
	a=10;
	b=5;
	c=a+b;
	printf("%d+%d=%d\n",a,b,c);
	c=a-b;
	printf("%d-%d=%d\n",a,b,c);
	return 0;
}

Pascal :

begin
  writeln('10+5=',10+5);
  writeln('10-5=',10-5);
end.