Question

How to calculate percentage to increase or decrease to compare two numbers in C++

Answer 1

#include <iostream>

double GetPercentageToIncreaseOrDecrease(float num1, float num2) {
    return (num2 - num1) / num1 * 100;
}
 
int main(void) {
    std::cout << "The percentage to increase from 30 to 40 is: " << GetPercentageToIncreaseOrDecrease(30, 40) << "% \n";
     
    std::cout << "The percentage to increase from 20 to 35 is: " << GetPercentageToIncreaseOrDecrease(20, 35) << "% \n";
 
    return 0;
}
 
 

 
 
/*
run:
 
The percentage to increase from 30 to 40 is: 33.3333% 
The percentage to increase from 20 to 35 is: 75% 
 
*/

 

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Answer 2

#include <iostream>
 
double GetPercentageToIncreaseOrDecrease(float num1, float num2) {
    return (num2 - num1) / num1 * 100;
}
  
int main(void) {
    std::cout << "The percentage to decrease from 40 to 30 is: " << GetPercentageToIncreaseOrDecrease(40, 30) << "% \n";
      
    std::cout << "The percentage to decrease from 35 to 20 is: " << GetPercentageToIncreaseOrDecrease(35, 20) << "% \n";
  
    return 0;
}
  
 
 
  
  
/*
run:
  
The percentage to decrease from 40 to 30 is: -25% 
The percentage to decrease from 35 to 20 is: -42.8571% 
  
*/

 

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