can anyone give me a clue On this C programming solution. I am not getting an out put. sin(x) = x - x3/3! + x5/5! - x7/7!.... Code: #include <stdio.h> #include <math.h> //#include "stdafx.h" int factorial (int); int main () { int n, m; float x,sinx; printf("input a value for x :"); scanf_s("%f",&x); //comp_op=sin((double)x); //printf("computer value: %f",comp_op); n=1; sinx=0; while (n<=4); { n =pow(-1,(n-1)*pow(x,(2*(n-1)+1))/factorial(2*(n-1)+1)); sinx +=n; } printf("sin%f=%f",x, sin(x)); //scanf_s("%f",&x); return 0; } int factorial(int n); int factorial(int n) { int factorial=1; while(n>0) { factorial*=n; n--; } return factorial; }

I'd do it incrementally at each stage, eg. x^3 to x^5 to x^7; at each stage multiply by x squared (which you pre-calculate). 3! to 5! to 7!; at each stage multiply by two steps of an encrementing sequence, like f *= fact++; From 3! to 5! it would start at 4, so you do *4 then *5. f *= fact++; Next loop, you would get *6 then *7 to go from 5! to 7! I assume you are doing this as an excercise rather than calculating a sine for use in a program?

//Just modified your code a bit, try this and see what happens, just // set the + or - for your 3^ 5^ or 7^: 'Clean up the code after you see //what happens, or you see where it went wrong for you' Code: #include <cstdlib> #include <iostream> #include <stdio.h> #include <math.h> using namespace std; int factorial(int a); int n,b; int lngFract[20]; int main(){ system("PAUSE"); int m,i,j; float z,y,x,sinx; printf("input a value for x :"); scanf("%f",&x); printf("d= %f",x); system("PAUSE"); b=1; n=1; j=3; m=2; i=1; sinx=0; while (i<5){ if (i == 1) sinx = sinx + x; else { z = pow(x,m + 1); //printf("x= %f",z); n = factorial(j); //printf("n= %d",n); y = z/n; //printf("y= %f",y); m = m + 2; j = j + 2; sinx = sinx + y; //printf("sin%f=%f",x, sin(x)); } ++i; } printf("sin%f=%f",x, sin(x)); system("PAUSE"); return EXIT_SUCCESS; //scanf_s("%f",&x); return 0; } int factorial(int a) { //printf("d= %d",n); if (b==1) { n =a; lngFract[b-1] = a; b++; } else { lngFract[b-1] = a; n = lngFract[b-1] * n; //printf("d= %d",n); b++; } if (a > 1) { factorial (a-1); } b=1; return n; }

try out with this coding...... #include<stdio.h> #include<conio.h> int fact(int); int sine(int); void main() {

try out with this coding........ #include<stdio.h> #include<conio.h> int fact(int); int sine(int) void main() {