strlen in c 2b 2b

1#include <cstring>
2#include <cstring>
3
4using namespace std;
5
6int main(void) {
7  char stringName[] = "This contains the content of your string";
8  int stringLength = strlen(stringName);
9  cout << "String: " << stringName << endl << "Length of String: " << stringLength << endl;
10  
11  return 0;
12}

1#include <iostream>
2#include <string.h>
3
4using namespace std;
5
6int main()
7{
8    char *str = "ABC";
9    cout << strlen(str) << endl;
10    return 0;
11}

1#include <cstring>
2#include <iostream>
3
4using namespace std;
5
6int main()
7{
8    char str1[] = "This a string";
9    
10    int len1 = strlen(str1);
11
12    cout << "Length of str1 = " << len1 << endl;
13
14    return 0;
15}

1#include <cstring>
2strlen(str);
3

1#include <cstring>
2#include <iostream>
3using namespace std;
4
5int main() {
6  char str1[] = "This a string";
7  char str2[] = "This is another string";
8
9  // find lengths of str1 and str2
10  // size_t return value converted to int    
11  int len1 = strlen(str1);
12  int len2 = strlen(str2);
13
14  cout << "Length of str1 = " << len1 << endl;
15  cout << "Length of str2 = " << len2 << endl;
16
17  if (len1 > len2)
18    cout << "str1 is longer than str2";
19  else if (len1 < len2)
20    cout << "str2 is longer than str1";
21  else
22    cout << "str1 and str2 are of equal length";
23
24  return 0;
25}

1#include <iostream>
2#include <cstring>
3using namespace std;
4
5int main() {
6
7  // initialize C-string
8  char song[] = "We Will Rock You!";
9
10  // print the length of the song string
11  cout << strlen(song);
12
13  return 0;
14}
15
16// Output: 17