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#include <iostream>
#include <ctype.h>
using namespace std;
int str_is_only_numeric(const char *str) {
int i = 0;
while (str[i] != '\0') {
if (isdigit(str[i++]) == 0) {
return -1;
}
}
return 0;
}
int main()
{
cout << str_is_only_numeric("1564") << endl;
cout << str_is_only_numeric("foo") << endl;
cout << str_is_only_numeric("1564bar666") << endl;
return 0;
}
