I am trying to find the scrabble value of a word using C program

Question

I am always getting the value of each letter I enter as 1 whereas I should get the values as described in the code. Please help find the error in my code.

#include <stdio.h>
#include <ctype.h>

char c;

char num (char c);

int main () {
    int sum;

    printf("Enter a word:");

    c=0;

        while (c=getchar() != '\n') {
            c=toupper(c);
            sum+=c;
        }

    printf("Scrabble value : %d",sum);

    return(0);
}

char num (char c) {

    if (c=='A'||c=='E'||c=='I'||c=='L'||c=='N'||c=='O'||c=='R'||c=='S'||c=='T'||c=='U') c=1;
    if (c=='D'||c=='G') c=2;
    if (c=='B'||c=='C'||c=='M'||c=='P') c=3;
    if (c=='F'||c=='H'||c=='V'||c=='W'||c=='Y') c=4;
    if (c=='K') c=5;
    if (c=='J'||c=='X') c=8;
    if (c=='Q'||c=='Z') c=10;

    return(c);
}

Answer 1

In short, this will work for you (call num; fixed getchar call in while; initialized sum to 0; no error handling):

#include <stdio.h>
#include <ctype.h>

char c;

char num (char c);

int main () {
    int sum = 0;

    printf("Enter a word:");

    c=0;

        while ((c=getchar()) != '\n') {
            c=toupper(c);
            sum+=num(c);
        }

    printf("Scrabble value : %d",sum);

    return(0);
}

char num (char c) {

    if (c=='A'||c=='E'||c=='I'||c=='L'||c=='N'||c=='O'||c=='R'||c=='S'||c=='T'||c=='U') c=1;
    if (c=='D'||c=='G') c=2;
    if (c=='B'||c=='C'||c=='M'||c=='P') c=3;
    if (c=='F'||c=='H'||c=='V'||c=='W'||c=='Y') c=4;
    if (c=='K') c=5;
    if (c=='J'||c=='X') c=8;
    if (c=='Q'||c=='Z') c=10;

    return(c);
}