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32 lines
809 B
JavaScript
32 lines
809 B
JavaScript
function roman_to_Int(str1) {
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if(str1 == null) return -1;
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var num = char_to_int(str1.charAt(0));
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var pre, curr;
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for(var i = 1; i < str1.length; i++){
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curr = char_to_int(str1.charAt(i));
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pre = char_to_int(str1.charAt(i-1));
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if(curr <= pre){
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num += curr;
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} else {
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num = num - pre*2 + curr;
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}
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}
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return num;
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}
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function char_to_int(c){
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switch (c){
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case 'I': return 1;
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case 'V': return 5;
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case 'X': return 10;
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case 'L': return 50;
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case 'C': return 100;
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case 'D': return 500;
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case 'M': return 1000;
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default: return -1;
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}
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}
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console.log(roman_to_Int('XXVI'));
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console.log(roman_to_Int('CI'));
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