[Solved] Comparing characters of a string [closed]

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You need to intialize variables a and b.
I think like this

char a="a", b='b';

Check this code. I think this is what you need

int main ()
{
    char string[20];
    char a="a", b='b';
    int i = 0;
    int sum = 0;
    printf (" my word is:\n");
    scanf ( "%s", string);

    for (i = 0; string[i] !='\0'; i++)
    {
        if (string[i]==a ) 
        {            
             sum= sum + 1;
        } 
        else if (string[i]==b ) 
        {
             sum= sum + 2;
        }
    }
    printf ("%d\n" , sum);
    return 0;

}

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solved Comparing characters of a string [closed]