How to stop user entering char as int input in C

Question

Heres a part of my code:

    printf(\"\\nEnter amount of adult tickets:\");
    scanf(\"%d\", &TktAdult);
    while (TktAdult<0){
        printf(\"\\n         


        

Answer 1

but how do I add to it so it also stops user from entering a char??

You can't prevent user from entering character values. What you can do is check if tktAdult was successfully scanned. If not, flush out everything from stdin:

 bool valid = false;
 while (true) {
 ...

    if (scanf("%d", &TktAdult) != 1) {
       int c;
       while ((c = getchar()) != EOF && c != '\n');
    } else {
       break;
    }
}

The better alternative is to use fgets() and then parse the line using sscanf().

Also see: Why does everyone say not to use scanf? What should I use instead?.