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51 lines
679 B
C++
51 lines
679 B
C++
#include <cctype>
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#include <cmath>
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#include "util.h"
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int str2int(const char *str, int len)
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{
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int res = 0;
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for (const char *sp = str; sp < str + len; sp++) {
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if (::isdigit(*sp))
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res = res * 10 + *sp - '0';
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else
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return -1;
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}
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return res;
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}
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double niceNum(double x, int round)
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{
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int expv;
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double f;
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double nf;
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expv = (int)floor(log10(x));
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f = x / pow(10.0, expv);
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if (round) {
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if (f < 1.5)
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nf = 1.0;
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else if (f < 3.0)
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nf = 2.0;
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else if (f < 7.0)
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nf = 5.0;
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else
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nf = 10.0;
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} else {
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if (f <= 1.0)
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nf = 1.0;
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else if (f <= 2.0)
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nf = 2.0;
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else if (f <= 5.0)
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nf = 5.0;
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else
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nf = 10.0;
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}
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return nf * pow(10.0, expv);
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}
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