go - How scanf and scan parses the input

Question

I had this simple problem statement which I tried implementing in Go.

Write a program to find the remainder when an integer A is divided by an integer B.

In the first piece of code i used fmt.Scanf and the test cases failed.

import "fmt"

func main(){
    var a,b,T int;
    fmt.Scanf("%d",&T);
    for i:=0; i<T; i++ {
        fmt.Scanf("%d",&a);
        fmt.Scanf("%d",&b);
        ans := a % b;
        fmt.Println(ans);
    }
}

The modulo operation was getting wrong answer. i got 0 2 0 instead of 1 100 10 on input

3 
1 2
100 200
40 15

but when I used fmt.Scan instead as in the following code cases passed, I was getting the right answer

package main

import "fmt"

func main(){
    var a,b,T int;
    fmt.Scan(&T);
    for i:=0; i<T; i++ {
        fmt.Scan(&a);
        fmt.Scan(&b);
        ans := a % b;
        fmt.Println(ans);
    }
}

Now my Question is why this happens. Does Scanf parses the input differently from Scan and which function to use for less error prone input.

Answer 1

等待大神答复