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https://github.com/pkivolowitz/asm_book.git
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34 lines
No EOL
789 B
C++
34 lines
No EOL
789 B
C++
#include <iostream>
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#include <cinttypes>
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#include <iomanip>
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#include <cmath>
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#include <string>
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using namespace std;
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union U {
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float f;
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uint32_t i;
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};
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int main(int argc, char ** argv) {
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U u;
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int e;
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cout << "Enter a number (-100 causes divide by 0, -200 causes sqrt(-1): ";
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cin >> u.f;
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if (u.f == -100) {
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cout << "Dividing by zero." << endl;
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u.f /= 0.0;
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} else if (u.f == -200) {
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cout << "Using sqrt(-1))." << endl;
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u.f = sqrtf(-1);
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}
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e = ((u.i >> 23) & 0xFF);
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cout << "sign: " << hex << ((u.i >> 31) & 0x01) << endl;
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cout << "exp: " << hex << e << " debiased: " << dec << e - 127 << endl;
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cout << "frac: " << hex << setw(7) << setfill('0') << (u.i & 0x7FFFFF) << endl;
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cout << "NaN: " << isnan(u.f) << endl;
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cout << "Inf: " << isinf(u.f) << endl;
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return 0;
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} |