利息的后续要求
#include<stdio.h> #include<math.h> #define x1 #define x2 double danli(double i,int N,double P)//单利计算 { double nlx,F; nlx = P*i; F = nlx*N + P; return F; } double fuli(double i,int W,int N,double P)//复利计算 { double F; i=pow(1+i/W,W)-1; F=P*pow((i+1),N); return F; } double gusuan(double i,int W,int N,double F)//估算 { double P; i = pow(1+i/W,W)-1; P = F/pow((i+1),N); return P; } double shijian(double P,double i,double F)//时间 { double N,x; x=F/P; N=(log(x))/(log(i+1)); return N; } double nianxian(double P,double N,double F)//年限 { double i; i = pow(F/P,1.0/N)-1.0; return i; } double sum() { double y,yue,F=0.0,i,mi; double nl,yl; int N; int ch,j; printf("****** 1-年投资 2-月投资 ******\n"); scanf("%d",&ch); if(ch == 1) { printf("请输入年投资额:\n"); scanf("%lf",&y) x2; } else { printf("请输入月投资额:\n"); scanf("%lf",&yue) x2; } printf("请输入年利率\n"); scanf("%lf",&i) x2; printf("请输入年限\n"); scanf("%d",&N) x2; if(ch == 1) { F = y; for(j=0 ; j<N ; j++) { nl = F*i; F=y+nl+F; } return F-y; } else { F = yue; mi = i/12.0; for(j=0 ; j<N*12 ; j++) { yl = F*mi; F=yue+yl+F; } return F-yue; } } double refund() { double P,i,month_amount; int N,month; printf("************您进入本息还款计算************\n"); printf("请输入贷款金额:\n"); scanf("%lf",&P); printf("请输入年利率:\n"); scanf("%lf",&i); printf("请输入归还年限:\n"); scanf("%d",&N); //每月还款额=[贷款本金×月利率×(1+月利率)^还款月数]÷[(1+月利率)^还款月数-1] i = i/12; month = N*12; month_amount = P*i*pow((1.0+i),month)/(pow(1.0+i,month)-1); return month_amount; } void main() { double P,F1,F,i; //P是本金,F是收益,i年利率 int N,W,ch2; //是期限 while(1) { printf("\t\t***************欢迎使用复利计算器*************\n\n"); printf("\t\t| -----1:复利---------------- |\n\n"); printf("\t\t| -----2:单利---------------- |\n\n"); printf("\t\t| ------3:估算---------------- |\n\n"); printf("\t\t| -------4:年限---------------- |\n\n"); printf("\t\t| ------5:年利率-------------- |\n\n"); printf("\t\t| ------6:月年收益------------ |\n\n"); printf("\t\t| ------7:等额本息还款-------- |\n\n"); printf("\t\t| ------0:为退出---------------- |\n\n"); printf("\t\t**************请选择想要的功能************\n"); x1 scanf("%d",&ch2) x2;//控制选择 switch(ch2){ case 1: printf("请输入本金:\n"); scanf("%lf",&P); printf("请输入年利率\n"); scanf("%lf",&i); printf("请输入年限:\n"); scanf("%d",&N); printf("请输入复利次数:\n"); scanf("%d",&W); F1 = fuli(i,W,N,P); break; case 2: printf("请输入本金:\n"); scanf("%lf",&P); printf("请输入年利率\n"); scanf("%lf",&i); printf("请输入年限:\n"); scanf("%d",&N); F1 = danli(i,N,P); break; case 3: printf("请输入本利\n"); scanf("%lf",&F); printf("请输入年利率\n"); scanf("%lf",&i); printf("请输入年限:\n"); scanf("%d",&N); printf("请输入复利次数:\n"); scanf("%d",&W); F1 = gusuan(i,W,N,F); break; case 4: printf("请输入本金\n"); scanf("%lf",&P); printf("请输入年利率\n"); scanf("%lf",&i); printf("请输入本利\n"); scanf("%lf",&F); F1=shijian(P,i,F); break; case 5: printf("请输入本金:\n"); scanf("%lf",&P); printf("请输入本利:\n"); scanf("%lf",&F); printf("请输入年限\n"); scanf("%d",&N); F1=nianxian(P,N,F); break; case 6: F1=sum(); break; case 7: F1=refund(); break; case 0:break; default: printf("输入不合法!!\n"); continue ; } if(ch2==0) break; printf("结果为:%.2lf\n",F1); } }
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