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简易计算器#includeiostreamusingnamespacestd;voidmain(){doubleab;coutz/pleaseinputab〃〈〈endl;cinab;charop;coutz/pleasechoosewhatyouwhattodowiththenumbers/zendl;cinop;if(op-5+,)couta+b;if(op-,」)couta-b;if(op二二*,)cout〈〈a*b;if(op=二/)if(b-0)coutz/0error!z/:elsecouta/b;#includeiostreamusingnamespacestd;voidmain{doubleab;coutz/pleaseinputab/zendl;cinab;charop;coutz/pleasechoosewhatyouwhattodowiththenumbers/zendl;cinop;switchop{case+:couta+b;break;case:coutab;break;case*:cout〈〈a*b;break;case/:ifb==0coutz/error/zelsecouta/b;break;default:coutz/wrong/z;#includeiostreamusingnamespacestd;voidmain{chara;cina;ifa=48a=57coutz,itisanumber”;elsecout,,alpha,/;强制转换#includeiostreamusingnamespacestd;voidmain{coutchar97;面积体积#includeiostream#includemath.husingnamespacestd;voidmain{doubleRIIllR2H2sasvpai;pai=
3.14;coutz/inputRIHlR2H2,zendl;cin»Rl»Hl»R2»H2;cout«z,sa=,,«pai*R1*R1+R2*R2endl;cout«,,sv=,«pai*R1*R1*H1+pai*R2*R2*H2/3«endl;#includeiostreamusingnamespacestd;voidmain{charop;cout«〃请输入一个字符〃;cinop;ifop=48op=57cout〈〃该字符为数字〃endl;elseifop=65op=90||op=97op=122cout«〃该字符为字母〃endl;elsecout“其他字符〃endl;#includeiostream#includemath.husingnamespacestd;voidmain{floatr=l.5;constdoublepai=
3.14;intop;cout«〃请选择需要的计算类型1圆面积;2圆周长;3球表面积;4球体积;〃endl;cinop;switchop{:cout〃该圆的面积为〃pai*r*r〈〈endl;break;:cout〃该圆的周长为〃2*pai*rendl;break;:cout〈”该球的表面积为4*pai*r*r〈〈endl;break;:cout〈〃该球的体积为〃X4/3*r*r*r〈〈endl;break;default:cout〃错误〃endl;}P25示范题3#includeiostreamusingnamespacestd;voidmain{intnis;cout,zplkeaseinputanumberz,endl;cinn;coutn//=factor:,z;fori=ls=0;in;i++{ifn%i==0cout«i«z,z,s+=i;}cout«z/;s=,/«sz,;〃;ifs==ncout«z/YES!z,;elsecout〈〃NO!〃;P37实践题七#includeiostreamusingnamespacestd;voidmain{intnis;forn=l;n=1000;n++{fori=ls=0;in;i++{ifn%i==0s+=i;}ifs-ncoutnz/〃;}P38实践题九#includeiostreamusingnamespacestd;voidmain{intij;chardgt=65;fori=l;i=5;i++{forj=i-l;j0;j—coutz,forj=6-i;j0;j—{coutdgt;dgt+=l;}dgt-=4;forj=6-i;j0;j—P42自立题五#includeiostreamusingnamespacestd;voidmain{inti;fori=6;i=300;i+=10ifi%3=lcouti/z〃;。