如何在C中添加字符？

Question

So this is my code:

#include<stdio.h>
int main(){
char username[100];
int password, i;
char temp;

printf("Enter username: ");
scanf("%s", username);
for(i=0;i < strlen(username);i++){
    printf("\n%d", username[i]);
    temp = username[i];
    password = password + temp;
}
printf("\n");
printf("Your password: %d", password);
return 0;
}

I know its a bit messy. I've spend HOURS trying to find out why this doesn't work, whereas this does:

#include<stdio.h>
int main(){
char r = 'r';
char a = 'a';
char f = 'f';
int i;
i = r + a + f;
printf("%d", i);
return 0;
}

Answer 1

first of all learn the basics of C. you want to print out a decimal number with "%d". To output chars on console you need to use printf("%c", char_var). if its more than one character you need printf("%s", char[100]) (%s stands for string)

Answer 2

Don't use 'scanf' to take string inputs. Use 'fgets'. Username array contains characters. You can't display them as integers. You can't sum up the characters.