[Warning] Passing arg 1 of 'reversed' makes integer from pointer without a cast

[mastrxplodr]

I'm not sure what this error means but I know it has something to do with the way I'm passing the string into the function. I'm in my first programming class so forgive me if this is a n00b mistake..

//reverse
#include <stdio.h>
#include <string.h>

int reversed (char string1, char string2);
void swap (int* ptrA, int* ptrB);

int main(){
    char word1[20], word2[20];  
    printf("first word");
    scanf("%s", word1);
    printf("second word");
    scanf("%s", word2);
    
    if (reversed(word1, word2))
       printf("the strings are opposite");
    else printf("the strings are not opposite");
    
    system ("PAUSE");
    return 0 
}

//Pre: string1 is the name read in from the file. string 2 is the name from the 
//     customer_type array
//Post:If string1 is reversed and matches string2 1 is returned, if they don't 
//     match 0 is returned. 
int reversed (char string1[], char string2[]) {
     
     int i, len;
     char temp;
     len = strlen(string1);
     
     for (i = 0; i < len/2; i++) {
         swap (&string1[i], &string1[len-i-1]);
     }
     if (!strcmp(string1, string2); 
        return 1;
     else
         return 0;
}

//Pre: ptrA points to a single character in a string while ptrB points to the 
//     character equally distant from the center and on the other end of the 
//     string
//Post:Swaps the value contained in each of the memoory locations. 
void swap (int* ptrA, int* ptrB) {
     int temp = *ptrA;
     *ptrA = *ptrB;
     *ptrB = temp;
}

[Salem]

> int reversed (char string1, char string2);
does not match
> int reversed (char string1[], char string2[])

[vart]

note that &string1[i] is pointer to char not pointer to int - this will cause problems with your swap function