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

// You can try this,  Filter all except for the digital characters
int TktAdult;
char ch;
char str[10];
int i = 0;
printf("\nEnter amount of adult tickets:");
while ((ch = getchar()) != '\n')
{
    // Filter all except for the digital characters
    if(!isalpha(ch) && isalnum(ch))
        str[i++] = ch;
}
str[i] = '\0';
TktAdult = atoi(str);
printf("Done [%d]\n", TktAdult);