问题详情

在下列语句中存在错误的是()
A、int a,b;
scanf("%d,%d",&a,&b);
printf("a=%2d,b=%2d",a,b);
B、int a,b;
scanf("%d %f",&a,&b);
C、int a,b;
scanf("a=%d,b=%d",&a,&b);
printf("a=%d,b=%d",a,b);
D、int a,b;
scanf("%2d%2d",&a,&b);
printf("a=%d,b=%d",a,b);