void box(){

 printf("\n[A] Add");
 printf("\n[B] Subtract");
 printf("\n[C] Multiply");
 printf("\n[D] Divide");
 printf(" ");
 printf("\nEnter what you want to execute: ");

}

void box2(){

 printf("\n");
 printf("\nC - reset values and input again");
 printf("\nY - Continue and apply another operation to the answer");
 printf("\nX - Exit");
 printf("\nEnter you choice: ");

}


float add(float x,float y){
 return x+y;
}

float sub(float x,float y){
 return x-y;
}


float multi(float x,float y){
 return x*y;
}

float dev(float x,float y){
 return x/y;
}