#include<stdio.h>

char convert_percent_to_grade(float input)
{
    if(input>=80.0f)
    {
        return 'A';
    }
    else if(input>=60.0f && input <80.0f)
    {
        return 'B';
    }
    else if(input>=50.0f && input < 60.0f)
    {
        return 'C';
    }
    else 
    {
        return 'D';
    }

}

int main()
{
    float input;
    
    printf("What's the percentage:\n");
    scanf("%f",&input);
    
    char output = convert_percent_to_grade(input);
    
    printf("%.2f%% is %c Grade",input,output);
    
    
}