Thread: Comparing Value of Int to String

Aw, you're no fun. I was going to roll out the clever scanf scanset solution:

Code:

#include <stdio.h>

void discard(FILE *in);

int main(void)
{
  char option;

  printf("1) One\n2) Two\n3) Three\n4) Four\n> ");
  fflush(stdout);
  while (scanf("%[1234]", &option) != 1) {
    fprintf(stderr, "Invalid option, try again\n> ");
    clearerr(stdin);
    discard(stdin);
  }

  return 0;
}

void discard(FILE *in)
{
  int ch;

  while ((ch = fgetc(in)) != EOF && ch != '\n')
    ;
}

But here's a potential C++ solution as well, since this thread will probably be moved:

Code:

#include <iostream>

using namespace std;

int main()
{
  int option;

  cout<<"1) One\n2) Two\n3) Three\n4) Four\n> ";
  while (!(cin>> option) || option < 1 || option > 4) {
    cerr<<"Invalid option, try again\n> ";
    cin.clear();
    cin.ignore(cin.rdbuf()->in_avail(), '\n');
  }
}

>And have the C solution work in C++.
And then get run off of the C++ forum because you used scanf. Purists are annoying, aren't they?

By the way, it's <cstdio>. Case is important, but spelling is too.