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Summing 100 data values

#include <stdio.h> int main() { double data[100]; double sum = 0.0; int j = 0; double sign = 1.0; printf("\nYou entered the values:\n"); for(j = 1 ; j<=100 ; j++){ data[j-1] = 1.0/(2*j*(2*j+1)*(2*j+2)); } for(j = 0 ; j<100 ; j++) { sum += sign*data[j]; sign = -sign; } printf("\nResult is %.4lf\n", 4.0*sum+3); }