scanf “extra input” required

Question

for some simple HW code I wrote I needed to get 7 arguments via the scanf function:

scanf(\"%d %d %d %d\\n\", &vodka, &country, &life, &glut)         


        

Answer 1

White space characters in the scanf format string are directives that mean read white space characters until you get a non white space character. A trailing \n in your format string causes scanf to consume the linefeed that was typed by the user and to keep asking for input until a non white space character is seen, but is left in the input buffer.

To consume the \n exactly, you can use this ugly scanf format:

scanf("%d%*1[\n]", &mprice);

Or you can just remove the trailing \n and consume the character with getchar() but be aware that neither of these approaches provide for exact matching of the input:

scanf("%d", &mprice);
getchar();