(数字删除)下面程序的功能是将字符串中的数字字符删除后输出。请填空。
#include <iostream>
using namespace std;
int delnum(char *s) {
int i, j;
j = 0;
for (i = 0; s[i] != '\0'; i++)
if (s[i] < '0' (1) > '9') {
s[j] = s[i];
(2) ;
}
return (3) ;
}
const int SIZE = 30;
int main() {
char s[SIZE];
int len, i;
cin.getline(s, sizeof(s));
len = delnum(s);
for (i = 0; i < len; i++)
cout<< (4) ;
cout << endl;
return 0;
}