题解 | #表示数字#

#include <stdio.h>
#include <string.h>

int main() {
    char s[301] = {};
    int length = 0;

    while (scanf("%s", s) != EOF) { 
        length = strlen(s);
        for (int i=0; i<length; ++i) {
            if ((i==0) && (s[i]>='0'&&s[i]<='9')) {
				// 开始为数字
                for (int j=length-1; j>=i; --j) s[j+1] = s[j];
                s[i] = '*';
                length++;
            } else if ((i<length-1) && (s[i]<'0'||s[i]>'9') && (s[i+1]>='0'&&s[i+1]<='9')) {
				// 由其他字符变为数字
                for (int j=length-1; j>i; --j) s[j+1] = s[j];
                s[i+1] = '*';
                i++;
                length++;
            } else if ((i<length-1) && (s[i+1]<'0'||s[i+1]>'9') && (s[i]>='0'&&s[i]<='9')) {
				// 由数字变为其他字符
                for (int j=length-1; j>i; --j) s[j+1] = s[j];
                s[i+1] = '*';
                length++;
            } else if ((i==length-1) && (s[i]>='0'&&s[i]<='9')) {
				// 末位为数字
                s[i+1] = '*';
                length++;
            } else {}
        }
        printf("%s", s);
    }
    return 0;
}