用户投稿#include <iostream>#include <string>using namespace std;int main() {// Complete the program string s1, s2 ; cin >> s1 >> s2 ; /*In the 1st line print two space-separated integers, representing the length of a and b respectively.*/ cout << s1.size() << " " << s2.size() << endl; /*In the 2nd line print the string produced by concatenating a and b (a+b).*/ cout << s1 << s2 << endl ; /*In the 3rd line print a' and b' that the same as a and b, except that their first characters are swapped.*/ cout << s2.substr(0,1) << s1.substr(1) << " " << s1.substr(0,1) << s2.substr(1) ; return 0;}C++ provides a nice alternative data type to manipulate strings, and the data type is conveniently called string. Some of its widely used features are the following:
Declaration:string a = "abc";Size:int len = a.size();Concatenate two strings:string a = "abc";string b = "def";string c = a + b; // c = "abcdef".Accessing iᵗʰ element:string s = "abc";char c0 = s[0]; // c0 = 'a'char c1 = s[1]; // c1 = 'b'char c2 = s[2]; // c2 = 'c's[0] = 'z'; // s = "zbc"P.S.: We will use cin/cout to read/write a string.
Input Format
You are given two strings, a and b, separated by a new line. Each string will consist of lower case Latin characters ('a'-'z').
Output Format
In the first line print two space-separated integers, representing the length of a and b respectively.
In the second line print the string produced by concatenating a and b(a+b).
In the third line print two strings separated by a space, a' and b'. a' and b' are the same as a and b, respectively, except that their first characters are swapped.
Sample Inputabcdef
Sample Output4 2abcdefebcd af
Explanation
• a = "abcd"
• b = "ef"
• │a│ = 4
• │b│ = 2
• a + b = "abcdef"
• a' = "ebcd"
• b' ="af"
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