Question

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

Answer 1

#include <stdio.h>

double GetPercentageToIncreaseOrDecrease(float num1, float num2) {
    return (num2 - num1) / num1 * 100;
}

int main(void) {
    printf("The percentage to increase from 30 to 40 is: %.2f%%\n", GetPercentageToIncreaseOrDecrease(30, 40));
    
    printf("The percentage to increase from 20 to 35 is: %.2f%%\n", GetPercentageToIncreaseOrDecrease(20, 35));

    return 0;
}




/*
run:

The percentage to increase from 30 to 40 is: 33.33%
The percentage to increase from 20 to 35 is: 75.00%

*/

 

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Answer 2

#include <stdio.h>

double GetPercentageToIncreaseOrDecrease(float num1, float num2) {
    return (num2 - num1) / num1 * 100;
}

int main(void) {
    printf("The percentage to decrease from 40 to 30 is: %.2f%%\n", GetPercentageToIncreaseOrDecrease(40, 30));
    
    printf("The percentage to decrease from 35 to 20 is: %.2f%%\n", GetPercentageToIncreaseOrDecrease(35, 20));

    return 0;
}





/*
run:

The percentage to decrease from 40 to 30 is: -25.00%
The percentage to decrease from 35 to 20 is: -42.86%

*/

 

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