15.条件运算符来完成分数评级

#include <stdio.h>

//利用条件运算符的嵌套
//(a>b)?a:b

int main()
{
    int score;
    printf("please input a score\n");
    scanf("%d",&score);
    char grade;
    grade=score>=90?'A':(score>=60?'B':'C');
    printf("%c",grade);
}