How to compare strings

问题

I wanted to compare a string without actually defining one of them as a string, something like this,

if (string == 'add')

Do I have to declare 'add' as a string or is it possible to compare in a similar way?

回答1:

In C++ the std::string class implements the comparison operators, so you can perform the comparison using == just as you would expect:

if (string == "add") { ... }

When used properly, operator overloading is an excellent C++ feature.

回答2:

You need to use strcmp.

if (strcmp(string,"add") == 0){
    print("success!");
}

回答3:

You could use strcmp():

/* strcmp example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char szKey[] = "apple";
  char szInput[80];
  do {
     printf ("Guess my favourite fruit? ");
     gets (szInput);
  } while (strcmp (szKey,szInput) != 0);
  puts ("Correct answer!");
  return 0;
}

来源：https://stackoverflow.com/questions/6222583/how-to-compare-strings