Question

C语言编写程序输入一实数x和一整数n，求x+x^2+x^3+…+x^n的值。

Answer 1

#include <stdio.h>int main() {
float x,y,sum = 0;
int i = 1,n;
printf("输入x:");
scanf("%f",&x);
y = 1.0;
printf("输入正整数n:");
scanf("%d",&n);
for(i = 1;i <= n;i++) {
y = x*y;
sum = sum + y;
}
printf("计算结果是:%f\n\n",sum);
return 0;
}

Answer 2

#include <stdio.h>int main() {
float x,y,sum = 0;
int i = 1,n;
printf("输入x:");
scanf("%f",&x);
y = 1.0;
printf("输入正整数n:");
scanf("%d",&n);
for(i = 1;i <= n;i++) {
y = x*y;
sum = sum + y;
}
printf("计算结果是:%f\n\n",sum);
return 0;
}

Answer 3

#include <stdio.h>
void main()
{
int n;
double x,sum=0,temp=1;
printf("输入x和n(以空格隔开):");
scanf("%lf %d",&x,&n);
while(n>0)
{
temp*=x;
sum+=temp;
n--;
}
printf("sum=%lf\n",sum);
}

Answer 4

#include<stdio.h>
void main()
{
int x,n;
int sum=1;
int total=0;
scanf("%d,%d",&x,&n);
for(int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
{
sum=sum*x;
}
total+=sum;
sum=1;
}
printf("%d",total);
}

Answer 5

#include <stdio.h>int main()
{
double x; scanf("%lf",&x);
int i,n; scanf("%d",&n);
double p=1;
double s=0;
for(i=1;i<=n;i++)
{
p*=x;
s+=p;
}
printf("%lf\n",s);
return 0;
}