Thread: Code not working properly.

scanf return number of variables it successfully filled with info - it has nothing to do with format types - only number of formats is important

Code:

scanf("%d %*s %c", &num, &ch)

Possible return values are
EOF - is end-of-file reached on input stream
0 if num cannot be read using first format (%d in the sample)
1 if num was read but second parameter was failed to read (%*s is ignored and does not affect the return value at all)
2 if both variables were filled successfully

if you have more format specifiers in the string and more variables - return value can be bigger - till the number of vars passed.
so in most cases the reasonable way to call scanf

Code:

if(scanf(format_string, variables) == number_of_variables)
{
  //handle sucess
}
else
{
 //handle failure
}

The only exception I know is %n specifier - that does not counts - so its variable should not be used in the number_of_variables count