I'm a beginner . I kinda need help if one fine gentlemen or lady may help a fella out

[ialexsandu]

Hello . I need some help . I'm trying to make a program that lets me add a text , then replaces every letter with its specific number alphabetically . Basically :
Example -> 5 28 1 13 16 12 5
This is what i've got so far and it doesn't look too good .

#include <iostream>
#include <string>
using namespace std;
int main()
{
    char s[255];
    int i;

    cin.get (s,255);               /// That's how i learned at school you read the text .
    for(i = 1; i <= 31; i++) {     /// 31 Letters are in the alphabet .
        if (s[0] = 'a')            /// I was about to make the same thing with b,c,d,etc.
            cout << "1";           /// 1 because it's a .
    }
    return 0;
}