问题：
A student's letter grade is calculated according t
答案：
#include int main() { float grade; char letter; printf("Enter the student's numerical grade: "); scanf("%f", &grade); if (grade >= 90.0) letter = 'A'; //if-else chain ★★★ else if (grade >= 80.0) letter = 'B'; else if (grade >= 70.0) letter = 'C'; else if (grade >= 60.0) letter = 'D'; else letter = 'F'; printf("\nThe student receives a grade of %c", letter); return 0; }