已知5名学生的4门课的成绩，分别求出每门课的平均值

void main(){
int a[5][4];
int b[4]={0};
for (int i=0;i<5;i++){
printf("第%d个学生的成绩:\n",i+1);
scanf("%d,%d,%d,%d",&a[i][0],&a[i][1],&a[i][2],&a[i][3]);
}
for (i=0;i<4;i++){
for (int j=0;j<5;j++)
b[i]+=a[j];
printf("第%d门课的平均分为%4.1f\n",i+1,(float)b[i]/5);
}
}

int subject1 = 80;
int subject2 = 85;
int subject3 = 98;
int subject4 = 100;
int subject5 = 76;

int total = subject1 + subject2 + subject3 + subject4 + subject5;

int average = total / 4;

printf("平均分是%d", average)