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;
}