source.c

#include <stdio.h>

int main() {
    int score[6] = {76, 82, 90, 86, 79, 62};
    int credit[6] = {2, 2, 1, 2, 2, 3};
    int stu_number;
    float mean, sum;
    int temp;
    int i;

    printf("please input your student number:");
    scanf("%d" , &stu_number);

    sum = 0;
    temp = 0;

    for(i = 0 ; i < 6 ; i++) {
         sum = sum + score[i] * credit[i];
         temp = temp + credit[i];
    }

    mean = sum / temp ;
    if(mean >= 60) {
         mean = mean - 60 ;
         printf("the score of student number %d is %f higher than 60.\n", stu_number, mean);
    } else {
         mean = 60 - mean ;
         printf( "the score of student number %d is %f lower than 60.\n", stu_number, mean ) ;
    }

    return 0;
}