fflush（stdin）的功能是否类似于scanf（“％* [^ \ n]％* c”）的功能？

Question

我刚刚找到以下代码。但我不明白scanf("%*[^\n]%*c")的含义。 ^\n是什么意思？ *和^\n之前的c是什么意思？

我想在C语言中进行一个循环，当程序要求输入整数并且用户键入非数字字符时，程序再次要求输入整数。

    /*

         This program calculates the mean score of a user 4 individual 
         scores,and outputs the mean and a final grade
         Input: score1, score2,score2, score3
         Output: Mean, FinalGrade

        */

            #include <stdio.h>
        //#include <stdlib.h>

        int main(void){
          int userScore = 0; //Stores the scores that the user inputs
          float meanValue = 0.0f; //Stores the user mean of all the notes
          char testChar = 'f'; //Used to avoid that the code crashes
          char grade = 'E'; //Stores the final 
          int i = 0; //Auxiliar used in the for statement

          printf("\nWelcome to the program \n Tell me if Im clever enough! \n Designed for humans \n\n\n");
          printf("Enter your 4 notes between 0 and 100 to calculate your course grade\n\n");

          // Asks the 4 notes. 
          for ( ; i<=3 ; i++ ){
            printf("Please, enter your score number %d: ", i+1);

            //If the note is not valid, ask for it again

            //This is tests if the user input is a valid integer.
            if ( ( scanf("%d%c", &userScore, &testChar)!=2 ||testChar!='\n'))
{
              i-=1;
              scanf("%*[^\n]%*c");

            }else{ //Enter here if the user input is an integer
              if ( userScore>=0 && userScore<=100 ){
            //Add the value to the mean
            meanValue += userScore;
              }else{ //Enter here if the user input a non valid integer
            i-=1;
            //scanf("%*[^\n]%*c");
              }    
            }
          }

          //Calculates the mean value of the 4 scores
          meanValue = meanValue/4;

          // Select your final grade according to the final mean
          if (meanValue>= 90 && meanValue <=100){
            grade = 'A';
          } else if(meanValue>= 80 && meanValue <90){
            grade = 'B';
          } else if (meanValue>= 70 && meanValue <80){
            grade = 'C';
          } else if(meanValue>= 60 && meanValue <70){
            grade = 'D';
          }
          printf("Your final score is: %2.2f --> %c \n\n" , meanValue, grade);

          return 0;
        }