Question

I have a problem with my code. It should be parsing inputs like

1 34 a 2 -5 67 c

or

3455 124 -123 111 s 123 3544 f g

Or any other mix of characters (of length 1) and numbers. Here is my code:

char oper = 0;
int number = 0;
do{
    if(scanf("%d", &number)==1)
    {
        ...
    }
    else
    {
        scanf("%c", &oper);
        if(oper == 'g')
        {
            ...
        }
        if(oper == 'h')
        {
            ...
        }
        ... 
    } 
} while(oper != '\n');

When it gets to a character the scanf("%c", &oper); copies “\n” into oper and I want it to be “a” or “s”

What is going wrong, and what can I do to fix it?

Answer 1

scanf(“%d” …) will scan past white space (blank, tab, newline) to get to the number.

scanf(“%c” …) will read the next character.

You need to figure out a way to scan past white space. Have you looked at the definitions for the formats to scanf?

Wikipedia seems quite helpful compared to normal man pages.