62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
/* Sum of series - Program to calculate sum of series 1 - x^2/2! + x^4/4! - x^6/6! + x^8/8! - ... */
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#include <stdio.h>
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#include <math.h>
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#include <conio.h>
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long fact(int n) ;
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void main()
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{
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int i, k, n ;
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float x, sum=0 ;
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clrscr() ;
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printf("Enter the number of terms: ") ;
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scanf("%d", &n) ;
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printf("Enter the value of x: ") ;
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scanf("%f", &x) ;
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/* i keeps track of term count , whereas k is used for calculation purpose */
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for(i=1, k=0 ; i<=n ; i++, k=k+2)
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{
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if(i%2==1)
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sum = sum + pow(x,k)/fact(k) ;
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else
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sum = sum - pow(x,k)/fact(k) ;
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}
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printf("Sum of the required series is %f", sum) ;
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getch() ;
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}
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long fact(int n)
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{
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int i ;
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long f=1;
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for(i=1 ; i<=n ; i++)
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f=f*i ;
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return f ;
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}
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/*
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Output1 :
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Enter the number of terms: 1
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Enter the value of x: 8
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Sum of the required series is 1.000000
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Output2:
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Enter the number of terms: 4
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Enter the value of x: 2
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Sum of the required series is -0.422222
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Output3:
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Enter the number of terms: 3
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Enter the value of x: 5
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Sum of the required series is 14.541667
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*/
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