C Exercises: Calculate the sum of the series [ 1-X^2/2!+X^4/4!- .........]
C For Loop: Exercise-18 with Solution
Write a program in C to find the sum of the series [ 1-X^2/2!+X^4/4!- .........].
Sample Solution:
C Code:
#include <stdio.h>
void main()
{
float x,sum,t,d;
int i,n;
printf("Input the Value of x :");
scanf("%f",&x);
printf("Input the number of terms : ");
scanf("%d",&n);
sum =1; t = 1;
for (i=1;i<n;i++)
{
d = (2*i)*(2*i-1);
t = -t*x*x/d;
sum =sum+ t;
}
printf("\nthe sum = %f\nNumber of terms = %d\nvalue of x = %f\n",sum,n,x);
}
Flowchart:
or
#include <stdio.h>
void main()
{
float x,s,t,num=1.00,fac=1.00;
int i,n,pr,y=2,m=1;
printf("Input the Value of x :");
scanf("%f",&x);
printf("Input the number of terms : ");
scanf("%d",&n);
s=1.00; t=1.00;
for (i=1;i<n;i++)
{
for(pr=1;pr<=y;pr++)
{
fac=fac*pr;
num=num*x;
}
m=m*(-1);
num=num*m;
t=num/fac;
s=s+t;
y=y+2;
num=1.00;
fac=1.00;
}
printf("\nthe sum = %f\nNumber of terms = %d\nvalue of x = %f\n",s,n,x);
}
Sample Output:
Input the Value of x :2 Input the number of terms : 5 the sum = -0.415873 Number of terms = 5 value of x = 2.000000
Flowchart:

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Previous: Write a program in C to make such a pattern like a pyramid with a number which will repeat the number in the same row.
Next: Write a program in C to display the n terms of harmonic series and their sum.
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C Programming: Tips of the Day
Clearing a char array c
It depends on how you want to view the array. If you are viewing the array as a series of chars, then the only way to clear out the data is to touch every entry. memset is probably the most effective way to achieve this.
On the other hand, if you are choosing to view this as a C/C++ null terminated string, setting the first byte to 0 will effectively clear the string.
Ref : https://bit.ly/3uM7JnL
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