c语言必背的典型程序设计题目 -选择、循环- 答案

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1、选择结构必背经典程序（参考答案）1、输入3个整数，排序后输出。#includevoidmain(){intx,y,z,t;scanf("%d%d%d",&x,&y,&z);if(x>y){t=x;x=y;y=t;}/*交换x,y的值*/if(x>z){t=z;z=x;x=t;}/*交换x,z的值*/if(y>z){t=y;y=z;z=t;}/*交换z,y的值*/printf("smalltobig:%d%d%d",x,y,z);}2、求解一元二次方程ax2+bx+c=0。#include

2、#includevoidmain(){doublea,b,c,deta,x1,x2;printf("Entera,b,c:");scanf("%lf%lf%lf",&a,&b,&c);if(fabs(a)>1e-6){deta=b*b-4*a*c;if(deta>0){x1=-b/(2*a)+sqrt(deta)/(2*a);x2=-b/(2*a)-sqrt(deta)/(2*a);;printf("有两个不同的实根：x1=%.2f,x2=%.2f",x1,x2);}el

3、seif(deta==0){x1=x2=-b/(2*a);printf("有两个相同的根：x1=x2=%.2f",x1);}else{x1=-b/(2*a);x2=sqrt(-deta)/(2*a);printf("有两个虚根:x1=%.2f+%.2f*i，x2=%.2f-%.2f*i",x1,x2,x1,x2);}}elseprintf("二次项系数为0，不是一元二次方程!");}3、已知银行整存整取存款不同期限的月息利率分别为：0.315% 期限一年0.330% 期限二年0.345% 期限三年0.

4、375% 期限五年0.420% 期限八年要求输入存钱的本金和期限，求到期时能从银行得到的利息与本金的合计。#includevoidmain(){doublecapital,total,interest;intdeadline;printf("Enteracapitalanddeadline:");scanf("%lf%d",&capital,&deadline);if(deadline>=8){interest=0.00420*capital*12*deadline;total=capita

5、l+interest;printf("Interest:%.3f,Total:%.3f",interest,total);}elseif(deadline>=5&&deadline<8){interest=0.00375*capital*12*deadline;total=capital+interest;printf("Interest:%.3f,Total:%.3f",interest,total);}elseif(deadline>=3&&deadline<5){interest=0.00345

6、*capital*12*deadline;total=capital+interest;printf("Interest:%.3f,Total:%.3f",interest,total);}elseif(deadline==2){interest=0.00330*capital*12*deadline;total=capital+interest;printf("Interest:%.3f,Total:%.3f",interest,total);}elseif(deadline==1){interes

7、t=0.00315*capital*12*deadline;total=capital+interest;printf("Interest:%.3f,Total:%.3f",interest,total);}elseprintf("scoreinputerror!");}4、给一个不多于5位的正整数，要求：①求出它是几位数；②分别打印出每一位数字；③按逆序打印出各位数字，例如原数是321，应输出123。#includevoidmain(){longa,b,c,d,e,x;scanf(

8、"%ld",&x);a=x/10000;/*分解出万位*/b=x%10000/1000;/*分解出千位*/c=x%1000/100;/*分解出百位*/d=x%100/10;/*分解出十位*/e=x%10;/*分解出个位*/if(a!=0)printf("thereare5,%ld%ld%ld%ld%ld",e,d,c,b,a);elseif(b!=0)printf("thereare4,%ld%