问题:
3. string foo = “ABCDE”;
4. foo.substring(3);
5. foo.concat(“XYZ”);
6.
Type the value of foo at line 6.()
3. string foo = “ABCDE”;
4. foo.substring(3);
5. foo.concat(“XYZ”);
6.
Type the value of foo at line 6.()
● 参考解析
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