add keyboard, fix display of negative numbers
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@ -76,7 +76,7 @@ static int is_valid_character(char letter){
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return 1;
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} else if(letter == CGRAM_EXP || letter == CGRAM_EXP_NEG){
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return 1;
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} else if(letter == '.' || letter == ' '){
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} else if(letter == '.' || letter == ' ' || letter == '-'){
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return 1;
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}
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