How to add command to scan if user input a character? I want to...

How to add command to scan if user input a character? I want to make a validation to warn user not to input character

Example: printf ("Error Input! Sorry, alphabets are not allowed, nPlease input marks:");

What code I need to write into code below?

Can Tutor give the C code?

#include <stdio.h>

int main ()

{

 /* the declaration-marks is two dimensional array. Since we have four students and four assessments so array is declared as 4 x 4 */

 int score[4][4];  

 float average_quiz1 = 0;

 int i , j ;  

 float total_Balqis = 0;

 float average_Balqis = 0;

 /* input of Assessment marks - entered marks of each student is stored in the array marks. The mark of Quiz 1 for student 1, Aisha is stored in score[0][0] , marks of Quiz 2 in score[0][1] , marks of mid-term in score[0][2] and marks of final in score[0][3]. The marks of Quiz 1 for student 2, Balqis is stored in score[1][0] , marks of Quiz 2 in score[1][1], marks of mid-term in score[1][2] and marks of final marks in score[1][3] and so on */

 for (i = 0; i < 4; i++)

 {

 printf("Enter the marks of Quiz 1, Quiz 2, Mid-Term and Final in sequences for student %d n", i+1);

 for (j = 0; j < 4; j++)

 {

  scanf ("%d", &score[i][j]);

    while(*&score[i][j]>100){

    printf ("Error Input! Sorry, marks over 100 are not allowed, nPlease input marks:");

    scanf ("%d", &score[i][j]);

  }

 }

 }

 /* Calculate the average marks of Quiz 1. Marks of quiz 1 are stored in the array score[0][0], score[1][0] , score[2][0] and score[3][0]. Sum the marks for Quiz 1 and divide by 4 to get average marks of Quiz 1*/

 for (i = 0; i < 4; i++)

 {

 average_quiz1 += score[i][0];

 }

 average_quiz1 /= 4;

 /* Calculate the total and average marks of Balqis. Marks of Balqis are stored in the array score[1][0], score[1][1] , score[1][2] and score[1][3]. Sum of marks for Balqis to get total and divide it by 4 to get average*/

 for (i = 0; i < 4; i++)

 {

  total_Balqis += score[1][i];

 }

 average_Balqis = total_Balqis / 4 ;

 /* Display calculation */

 printf ("n The average marks of Quiz 1 = %.2f n", average_quiz1);

 printf ("n The total marks of Balqis = %.2f n", total_Balqis); 

 printf ("n The average marks of Balqis = %.2f n", average_Balqis); 

 return 0;

}