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#include <stdio.h>
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#include <string.h>
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union Data{
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int i;
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float f;
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char str[20];
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};
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int main(){
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union Data data;
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data.i = 10;
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printf("data.i: %d\n", data.i);
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data.f = 3.14;
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printf("data.f: %f\n", data.f);
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strcpy(data.str, "Hello");
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printf("data.str: %s\n", data.str);
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return 0;
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}
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