#include iostreamusing namespace std;int main(){int a,b,c;cinabc;couta*0.2+b*0.3+c*0.5;return 0;}
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#include iostreamusing namespace std;int main(){int a;short b;coutsizeof(a)" "sizeof(b);return 0;}
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#include iostreamusing namespace std;int main(){float a;double b;coutsizeof(a)" "sizeof(b);return 0;}
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#include iostreamusing namespace std;int main(){bool a;char b;coutsizeof(a)" "sizeof(b);return 0;}
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#include iostream#include iomanipusing namespace std;int main(){float f;cinf;int a=f;couta;return 0;}
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#include iostream#include iomanipusing namespace std;int main(){char c;cinc;int a=c;couta;return 0;}
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#include iostream#include iomanipusing namespace std;int main(){int a;cina;char c=a;coutc;return 0;}
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#include iostream#include iomanipusing namespace std;int main(){int a;cina;bool b=a;int c=b;coutc;return 0;}
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#include iostreamusing namespace std;int main(){coutsizeof("Hello, World!");return 0;}
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/*直径=2*半径周长=2*pi*半径面积=pi*半径*半径pi=3.1415926*/#include iostream#include iomanipusing namespace std;int main(){double r;cinr;double d,l,s,pi=3.1415926;d=2*r;l=2*pi*r;s=pi*r*r;coutfixedsetprecision(4)d" "l" "s;return
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