#include <stdio.h>
#include <assert.h>
int main()
{
char grade;
int score;
scanf("%d", &score) ;
if((score>=90) && (score<=100))
{
grade='a';
} else if((score>=80) && (score<90))
{
grade='b';
} else if((score>=70) && (score<80))
{
grade='c';
} else if((score>=60) && (score<70))
{
grade='d' ;
} else
{
grade='f';
}
printf("%c \n", grade);
//assert(grade=='c');
return 0;
#include <stdio.h>
#include <assert.h>
int main()
{
char grade;
int score;
scanf("%d", &score);
if((100>=score) && (score>=90)){
grade='a';
}
else if((90>score) && (score>=80)){
grade='b';
}
else if((80>score) && (score>=70)){
grade='c';
}
else if((70>score) && (score>=0)){
grade='d';
}
else{grade='f';}
printf("%c" , grade);
//assert(grade=='c');
return 0;
}
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