Thread: need help with validation

  1. #1
    Registered User
    Join Date
    Oct 2005

    need help with validation

    #include <stdio.h> 
    int main(void)
      int ch;
      printf ("Press [Enter] to continue");
      while ((ch = getchar()) != '\n' && ch != EOF);
    yeah, my problem here, is to make sure that a user enters an integer only...

    browsing thru the forum, that code stood out... using the getchar() function..

    could you tell me what i would do in the while loop to make sure a user enters an integer only?


    could u explain what EOF means too?

    2nd question..

    lets say, my global variable is work_pay, it is a global variable because i want to access it in a few functions.

    how would i assign the value of work_pay from function1, so i can access it in functions 2 and 3?

    is it possible?

    edit.. i htink i solved it, heres my code...

    #include <stdlib.h>
    #include <stdio.h>
    #include <time.h>
    #include <math.h>
    #include <string.h>
    int work_pay;
    int work_pay2;
    void func1();
    void func2();
    int main()
        int count;
        func2(); // print data.
        func1(); //data entered
        func2(); //print new data
        return 0;
    void func1(){
         int ans, ans1;
         printf("Enter a number for work_pay: ");
         printf("enter a number for work_pay2: ");
         work_pay = ans;
         work_pay2 = ans1;
    void func2(){
         printf("work_pay is: %d\n\n",work_pay);
         printf("work_pay2 is: %d\n\n",work_pay2);
    Last edited by Enig.Ma; 10-23-2005 at 07:41 AM.

  2. #2
    C/C++Newbie Antigloss's Avatar
    Join Date
    May 2005
    int num, ch;
    while ( scanf("%d", &num) != 1 ) {
        while ((ch = getchar()) != '\n' && ch != EOF);
        printf("input again\n");

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