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void setx(int {…} void Ex::setx(int {…} Ex::void setx(int {…} void Ex::setx( ){…}
void setx(int {...} void Ex: :setx(int {...} Ex: :void setx(int {...} void Ex: :setx(){...}
t1=t2; t2.num1=t1.num1; r2.mark=t1.mark; t2.num2=t1.num2;
void setx(int t)... void Ex: :setx(int t)... Ex: :void setx(int t)... void Ex: :setx()...
t2.mark=t1.mark; t2.num1=t1.num1; t1=t2; t2.num2=t1.num2;