求和k(1到100)+k*k(1到50)+1/k(1到10)
#include <stdio.h>
int main()
{
double s1=0,s2=0,s3=0,t;
double k;
for(k=1;k<=100;k++)
{
s1=s1+k;
}
printf("%f\n",s1) ;
for(k=1;k<=50;k++)
{
t=k*k;
s2=s2+t;
}printf("%f\n",s2) ;
for(k=1;k<=10;k++)
{
t=1/k;
s3=s3+t;
}printf("%f\n",s3) ;
printf("之和为:%15.6f\n",s1+s2+s3);
return 0;
}