please write in C++

1] How to make sure the user entered an integer in C: char s[MAX LINE]; Minus one, to skip the newline character. fgets(s, sizeof (s), stdin); valid TRUE; for (i -0; i strlen(s)i ++i) if (lisdigit(s[i)) valid FALSE; break; Use the idea shown above to write a loop that only exits when the user has entered an integer