#include<stdio.h> #include<math.h> int main() { int i,n; double sum,item; sum=0; printf("input:n "); scanf("%d",&n); for(i=0;i<=n;i++) { item=pow(2,i); sum=sum+item; } printf("sum=%lf ",sum); return 0; }
#include<stdio.h> #include<math.h> int main() { int lower,upper,month,year,loan; double money,rate; lower=5;upper=30; printf("请输入贷款本金:loan "); scanf("%d",&loan); printf("请输入月利率:rate "); scanf("%lf",&rate); printf("还款年限 月还款额 "); for(year=lower;year<=upper;year++) { month=year*12; money=(loan*rate*pow((1+rate),month))/(pow((1+rate),month)-1); printf("%d %lf ",year,money); } return 0; }
#include<stdio.h> void main() { int num1,num2,y1,y2,y3,y5; double y4; printf("请输入两个数:num1,num2 "); scanf("%d%d",&num1,&num2); y1=num1+num2; y2=num1-num2; y3=num1*num2; y4=num1*1.0/num2; y5=num1%num2; printf("num1,num2和y1=%d num1,num2差y2=%d num1,num2积y3=%d num1,num2商y4=%lf num1,num2余y5=%d ",y1,y2,y3,y4,y5); }