Question

hello. In C programming, how can I check that the input received is an integer, and return an error message if it is not?

Answer 1

Actually, it isn't easy because C basically doesn't support exception handling like newer language such as C++

However, here is a trick :
basically, scanf will return 1 value if it is suceeded (the input is correct)

int num;
char term;
if(scanf("%d%c", &num, &term) != 2 || term != '\n')
printf("failure\n");
else
printf("valid integer followed by enter key\n");