Does scanf() take '\n' as input leftover from previous scanf()?

In the following C code:

char name[20];
int a;
int b;

for(i=0;i<10;i++)
{
    printf("\nEnter name, a & b: ");
    scanf("%s %d %d",name,&a,&b);
}

doe开发者_运维问答s scanf read in the '\n' entered at the end of scanf() in 1st iteration, for the 2nd iteration inputs?

scanf leaves the input stream pointing to the \n. In your case it doesn't make a difference: each time it's called, scanf will move along until it finds the next non-whitespace character. So giving it 10 lines of name, a, b as input will work as you expect.

But consider this:

scanf("%d", &a);
fgets(str, 20, stdin);

fgets reads until it finds the first newline character, so str will just get a value of \n, and fgets will not read the next line of input.