problem whit strlen

Question

i want the number of character in one string (string c) insert by input but it show error in the first parameter const * char and i understand it

Answer 1

There are a few problems with your code. First you have the wrong include, then you have type compatibility issues string to char * .

The code below will give you the expected result:

#include <iostream>
#include <cstring>

using namespace std;

int main(){
string c; int x;
cout << "insert phrase\n";
cin >> c;
x = strlen(c.c_str());
cout << x;
}

Or. Using gets, but the code playground doesn't seem to like this.

#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

int main(){
char * c; int x;
cout << "insert phrase\n";
gets(c);
x = strlen(c);
cout << x;
}

Or better yet using string the right way

#include <iostream>

using namespace std;

int main(){
string c; int x;
cout << "insert phrase\n";
cin >> c;
x = c.length();
cout << x;
}

Answer 2

No need to use strlen unless it's a char/wchar pointer. Just use the length member function.

MyString.length();

Answer 3

why don't you use sizeof operator

Answer 4

Can you post the code pliz ?

Answer 5

#include <iostream>
#include <string.h>

using namespace std;
int main(){
string c; int x;
cout << "insert phrase\n";
gets(c);
x = strlen(c);
cout << x;
}

Answer 6

why don't you use sizeof operator

how i use it, i am a benniger

Answer 7

@ aklex lol I was gonna post that as well in my previous post, but I got an important phone call and had to cut my post short.

@matteo
Also the playground doesn't seem to like the gets() function for input, even with the correct header. This is why I used cin >> c.

Answer 8

thanks