項目1:
#include <stdio.h>
int main()
{
int n;
double sum=0.0,t,sign=1.0;
for(n=1;n<=10;n++)
{
t = sign*(2*n-1)/(2*n+1);
sum = sum+t;
sign=-sign;
}
printf("sum=%.2lf",sum);
return 0;
}
項目2:
#include <stdio.h>
int main()
{
int i,m=1;
double sum,s=1.0;
for(i=0;i<=8;i++)
{
sum = sum+s/m;
m*=2;
s=-s;
}
printf("%.4lf",sum);
return 0;
}
#include <stdio.h>
int main()
{
int i,factorial=1;
double sum=0.0,s=1.0;
for(i=1;i<=9;i++)
{
factorial = factorial*i;
sum = sum+s/factorial;
s=-s;
}
printf("%.4lf",sum);
return 0;
}