new problem after not using fflush(stdin)

This is a discussion on new problem after not using fflush(stdin) within the C Programming forums, part of the General Programming Boards category; This is my previous codes: Code: printf("Please key in Sales Agent's code number>");/* Output statement*/ scanf("%d", &num); fflush(stdin); while( !(num ...

  1. #1
    Registered User
    Join Date
    Jun 2003
    Posts
    51

    new problem after not using fflush(stdin)

    This is my previous codes:
    Code:
    	printf("Please key in Sales Agent's code number>");/* Output statement*/
        scanf("%d", &num);
    	fflush(stdin);
    
    	while( !(num >= 1000 && num <= 9999) )/*if the condition is not true then print the error message*/
    	{
    		printf("\aInvalid code number! Please key in 4 digits code number.\n");
    		main();
    	}
    After changing fflush(stdin) to if ( (scanf("%d",&num) !=1)
    when i input a alphabet for variable num it will cause the problem to do a infinity loop.

  2. #2
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    Posts
    6,231
    Read this
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Registered User
    Join Date
    Jun 2003
    Posts
    51
    make me confusing .......
    before that just a single line code... Yet....
    Any other simple way?....
    i canT understand the codes ...

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