Sum of series

code:
series: 1/1+1/2+1/3+….+1/N

```#include<stdio.h>
int main()
{
int N,i;
float sum;
printf("Enter N:");
scanf("%d",&N);
sum=0;
i=1;
do{
sum=sum+1/(float)i;
i++;
}while(i<=N);
printf("Sum of series: %f",sum);
return 0;
}```

series: 1/1-1/2+1/3-1/4+1/5….1/N
code:

```#include<stdio.h>
int main()
{
int i,N,sign;
float sum;
printf("Enter value of N:");
scanf("%d",&N);
sum=0;
sign=1;
do{
sum=sum+(1.0/(float)i)*sign;
i++;
sign=sign*(-1);
}while(i<=N);
printf("Sum=%f",sum);

return 0;
}
```

Series: 1^2/1!+2^2/2!+3^2/3!+4^2/4!+…..+N^2/N!

code:

```#include<stdio.h>
int main(){

int i, N, factorial;
float sum;
printf("Enter N:");
scanf("%d",&N);
for(sum=0,i=1,factorial=1;i<N;i++,factorial=factorial*i){
sum=sum+(i*i)/(float)factorial;
}
printf("%f",sum);
return 0;
}
```

Series: 1^2/1!+3^2/2!+5^2/5!+….N^2/N!

code:

```#include<stdio.h>
int main(){

int i, N, x,factorial;
float sum;
printf("Enter number of terms N:");
scanf("%d",&N);

for(sum=0,i=1,factorial=1,x=1;i<=N;i++,factorial=factorial*(x-1)*x){
sum=sum+(x*x)/(float)factorial;
x=x+2;
}
printf("%f",sum);
return 0;
}```

program to find summation of squares of all numbers  from 5 to 25
series: 25+36+49+…..+625=?

code:

```#include<stdio.h>
int main(){

int sum,i;
sum=0;
for(i=5;i<=25;i++)
{
sum=sum+(i*i);
}
printf("%d",sum);

return 0;
}```

It would be a great help, if you support by sharing :)
Author: zakilive