存在程序,请问输入45,输出为()。 #include
int main() { float mark ; char grade ; scanf( "%f", &mark ) ; if ( mark >= 70 ) grade = 'A' ; else if ( mark >= 60 ) grade = 'B' ; else if ( mark >= 50 ) grade = 'C' ; else if ( mark >= 40 ) grade = 'D'; else if ( mark >= 30 ) grade = 'E' ; else grade = 'F' ; printf( " %c", grade ) ; return 0 ; }