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#include<stdio.h> #include<math.h> void List(); void A(); void B(); void C(); void D(); void E(); void F(); void G(); main() { int sel; while(1) { List(); printf("\t请选择:"); while(scanf("%d",&sel)!=1||sel<0||sel>7)//防止输入的是字符以及输入的数字不是整数0-7 { printf("\t输入错误!!!\n\n\t请重新选择:"); while(getchar() != ‘\n‘); // 处理回车键 } if(sel==0) { printf("\t欢迎下次再使用,谢谢!\n"); break; } switch(sel){//选择1~7的功能 case 1: A(); break; case 2: B(); break; case 3: C(); break; case 4: D(); break; case 5: E(); break; case 6: F(); break; case 7: G(); break; } } } void List()//目录表 { printf("\t|--------------------------------------|\n"); printf("\t| 功能 |\n"); printf("\t|--------------------------------------|\n"); printf("\t| |\n"); printf("\t| 1.复利(一次支付) |\n"); printf("\t| 2.复利(多次等额支付) |\n"); printf("\t| 3.单利 |\n"); printf("\t| 4.投入资金 |\n"); printf("\t| 5.投入时间 |\n"); printf("\t| 6.利率 |\n"); printf("\t| 7.每月等额本息还款 |\n"); printf("\t| 0.退出 |\n"); printf("\t| |\n"); printf("\t|--------------------------------------|\n"); } void A()//一次投入复利计算 { int n;//时间n double p,i,sum1;//总金额p,利率i,本利和sum1 printf("\n\t*请输入存款金额:"); while(scanf("%lf",&p)!=1||p<=0) { printf("\t输入错误!!!\n\n\t*请重新输入存款金额:"); getchar(); } printf("\t*请输入利率:"); while(scanf("%lf",&i)!=1||i<=0) { printf("\t输入错误!!!\n\n\t*请重新输入利率:"); getchar(); } printf("\t*请输入存储时间(年):"); while(scanf("%d",&n)!=1||n<=0||n>100) { printf("\t输入错误!!!\n\n\t*请重新输入存储时间(年):"); getchar(); } ; sum1=p*pow((1+i),n);//复利的计算公式 printf("\t**本利和为:%.2lf\n\n",sum1);//输出复利计算的结果 } void B()//多次等额支付复利计算 { int n; double p,i,sum2=0; char choose; printf("\n\t多次等额投入方式:\n\t1.等额多次月投\n\t2.等额多次年投\n\t*请选择:"); while(scanf("%d",&choose)!=1||choose<1||choose>2) { printf("\t输入错误!!!\n\n\t请重新选择:"); while(getchar() != ‘\n‘); } while(getchar() != ‘\n‘); if(choose==1) { printf("\n\t*请输入月投金额:"); while(scanf("%lf",&p)!=1||p<=0) { printf("\t输入错误!!!\n\n\t*请重新输入月投金额:"); getchar(); } printf("\t*请输入年利率:"); while(scanf("%lf",&i)!=1||i<=0) { printf("\t输入错误!!!\n\n\t*请重新输入利率:"); getchar(); } printf("\t*请输入存储时间(年):"); while(scanf("%d",&n)!=1||n<=0||n>100) { printf("\t输入错误!!!\n\n\t*请重新输入存储时间(年):"); getchar(); } sum2=p*12*(pow(1+i,n)-1)/i; printf("\t**本利和为:%.2lf\n\n",sum2); } else { printf("\n\t*请输入年投金额:"); while(scanf("%lf",&p)!=1||p<=0) { printf("\t输入错误!!!\n\n\t*请重新输入年投金额:"); getchar(); } printf("\t*请输入年利率:"); while(scanf("%lf",&i)!=1||i<=0) { printf("\t输入错误!!!\n\n\t*请重新输入利率:"); getchar(); } printf("\t*请输入存储时间(年):"); while(scanf("%d",&n)!=1||n<=0||n>100) { printf("\t输入错误!!!\n\n\t*请重新输入存储时间(年):"); getchar(); } sum2=(p*pow((1+i),n)-1)/i; printf("\t**本利和为:%.2lf\n\n",sum2); } } void C()//单利计算 { int n; double p,i,sum3; printf("\n\t*请输入存款金额:"); while(scanf("%lf",&p)!=1||p<=0) { printf("\t输入错误!!!\n\n\t*请重新输入存款金额:"); getchar(); } printf("\t*请输入年利率:"); while(scanf("%lf",&i)!=1||i<=0) { printf("\t输入错误!!!\n\n\t*请重新输入利率:"); getchar(); } printf("\t*请输入存储时间(年):"); while(scanf("%d",&n)!=1||n<=0||n>100) { printf("\t输入错误!!!\n\n\t*请重新输入存储时间(年):"); getchar(); } sum3=p*(1+i*n); printf("\t**本利和为:%.2lf\n\n",sum3); } void D() //投入资金 { int n; double sum4,i,p;//p为投入本金 printf("\n\t*请输入本利和:"); while(scanf("%lf",&sum4)!=1||sum4<=0) { printf("\t输入错误!!!\n\n\t*请重新输入本利和:"); getchar(); } printf("\t*请输入年利率:"); while(scanf("%lf",&i)!=1||i<=0) { printf("\t输入错误!!!\n\n\t*请重新输入利率:"); getchar(); } printf("\t*请输入存款时间(年):"); while(scanf("%d",&n)!=1||n<=0||n>100) { printf("\t输入错误!!!\n\n\t*请重新输入存款时间(年):"); getchar(); } p=sum4/(1+i*n); printf("\t**投入的本金为:%.2lf\n\n",p); } void E() //投入时间 { double n; double sum5,i,p; printf("\n\t*请输入存储金额:"); while(scanf("%lf",&p)!=1||p<=0) { printf("\t输入错误!!!\n\n\t*请重新输入存储金额:"); getchar(); } printf("\t*请输入年利率:"); while(scanf("%lf",&i)!=1||i<=0) { printf("\t输入错误!!!\n\n\t*请重新输入利率:"); getchar(); } printf("\t*请输入本利和:"); while(scanf("%lf",&sum5)!=1||sum5<=0) { printf("\t输入错误!!!\n\n\t*请重新输入本利和:"); getchar(); } n=(log(sum5/p))/(log(1+i)); printf("\t**投入的时间为:%.0lf\n\n",n); } void F() //利率 { double sum6,i,p,n; printf("\n\t*请输入存储金额:"); while(scanf("%lf",&p)!=1||p<=0) { printf("\t输入错误!!!\n\n\t*请重新输入存储金额:"); getchar(); } printf("\t*请输入存储时间(年):"); while(scanf("%d",&n)!=1||n<=0||n>100) { printf("\t输入错误!!!\n\n\t*请重新输入存储时间(年):"); getchar(); } printf("\t*请输入本利和:"); while(scanf("%lf",&sum6)!=1||sum6<=0) { printf("\t输入错误!!!\n\n\t*请重新输入本利和:"); getchar(); } i=pow((sum6/p),(1/n))-1; printf("\t**利率为:%.2lf\n\n",i); } void G() { double sum7,i,p,n; printf("\n\t*请输入贷款金额:"); while(scanf("%lf",&sum7)!=1||sum7<=0) { printf("\t输入错误!!!\n\n\t*请重新输入本利和:"); getchar(); } printf("\t*请输入贷款时间(年):"); while(scanf("%d",&n)!=1||n<=0||n>100) { printf("\t输入错误!!!\n\n\t*请重新输入贷款时间(年):"); getchar(); } printf("\t*请输入年利率:"); while(scanf("%lf",&i)!=1||i<=0) { printf("\t输入错误!!!\n\n\t*请重新输入利率:"); getchar(); } p=sum7*i/(12*(1+i)*(pow(1+i,n)-1)); printf("\t**每月等额本息还款为:%.2lf\n\n",p); }
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原文地址:http://www.cnblogs.com/mingyin/p/5339285.html