35 lines
453 B
C
35 lines
453 B
C
#ifndef NOFLOAT
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extern double frexp();
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double
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ldexp(fl,exp)
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double fl;
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int exp;
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{
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int sign = 1;
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int currexp;
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if (fl<0) {
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fl = -fl;
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sign = -1;
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}
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fl = frexp(fl,&currexp);
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exp += currexp;
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if (exp > 0) {
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while (exp>30) {
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fl *= (double) (1L << 30);
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exp -= 30;
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}
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fl *= (double) (1L << exp);
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}
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else {
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while (exp<-30) {
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fl /= (double) (1L << 30);
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exp += 30;
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}
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fl /= (double) (1L << -exp);
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}
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return sign * fl;
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}
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#endif
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