《C++程序设计教程 第2版》教学素材习题04答案.docVIP

习题4答案 1． #include iostream.h void main() { double a,b,c,max; cout请输入三个数:endl; cinabc; if(ab) max=a; else max=b; if(maxc) max=c; cout最大数为：maxendl; } 2．#include iostream.h void main( ) { int year; cout请输入年份：; cinyear; if((year%4==0 year%100!=0) || year%400==0) coutyear是闰年endl; else coutyear不是闰年endl; } 3． 4． #include iostream.h void main() { int i,count=0; for(i=1;i=1000;i++) if(i%9==0 i%11==0) { couti\t; count++; if(count%5==0) coutendl; } } 5．If-else语句答案： #include iostream.h void main() { int score; cout请输入百分制成绩：; cinscore; if(score100 || score0) cout输入的成绩有错！endl; else { cout\n五分制成绩为：; if(score=90) coutAendl; else if(score=80) coutBendl; else if(score=70) coutCendl; else if(score=60) coutDendl; else coutEendl; } } Switch语句答案： #include iostream.h void main() { int score; cout请输入百分制成绩：; cinscore; if(score100 || score0) cout输入的成绩有错！endl; else { cout\n五分制成绩为：; switch(score/10) { case 10: case 9: coutAendl; break; case 8: coutBendl; break; case 7: coutCendl; break; case 6: coutDendl; break; default: coutEendl; } } } 6．If-else语句答案： #include iostream.h void main() { int base1,base2,base3,base4,base5,base6,base7,base8; float money,tax; base1=0.05*500; base2=base1+0.1*1500; base3=base2+0.15*3000; base4=base3+0.2*15000; base5=base4+0.25*20000; base6=base5+0.3*20000; base7=base6+0.35*20000; base8=base7+0.4*20000; cout请输入收入金额：; cinmoney; if(money0) cout输入的金额不能是负数！endl; else { money=money-800; if(money=0) tax=0; else if(money=500) tax=money*0.05; else if(money=2000) tax=base1+(money-500)*0.1; else if(money=5000) tax=base2+(money-2000)*0.15; else if(money=20000) tax=base3+(money-5000)*0.2; else if(money=40000) tax=base4+(money-20000)*0.25; else if(money=60000) tax=base5+(money-40000)*0.3; else if(money=80000) tax=base6+(money-60000)*0.35; else if(m