getting error on caesar

Question

I keep getting an error on the last else idk what's wrong with that code.

#include <cs50.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int main(int argc, string argv[])

    {
    int key = atoi( argv[1]);
    string text= get_string("text:");
        {
        for (int i = 0; i <strlen(text); i++)
            {
            
            if (isupper (text[i]))
                {
                printf("%i", (((text[i] - 'A') + key) % 26) + 'A');
                }
            else if (islower (text[i]))
                {
                printf("%i", (((text[i]- 'a')+ key) % 26) + 'a');
                }
            
            else
                {
                printf("%i ", text[i]);
                }
            }
        
        printf("\n");
        return 0;
        }
    else 
    {
        printf("Usage: ./Caesar\n");
        return 1;
    }
}

Answer 1

I’m assuming by last else you mean the one that returns 1. At a glance it looks like that else does not belong to an if statement. Is this all right of your code?

Answer 2

Else does not stand alone. You can use "if, if, if" or "if,if, else" or "if, else if, else". you can use as many ifs and "else ifs" but only one else.