On my Linux computer, I am using the command:

gcc programname.c -lm

for the following code:

I keep getting this error for the lines I put in bold:Code:#include<time.h> #include<stdio.h> #include<math.h> #include<stdlib.h> int main(void) { int p, d, h, what, end, steps; double i, n, M, c, w, q, measure; end = 2000; steps = 1000; double average1[end][2], average2[end][2]; int width[end][steps]; //w is equal to the possible number of ways to choose a reactant molecule, // which in our case is equal to how many molecules exist in the system w = 0; what = 10000; measure = 0.01; //c defines the propensity of the reaction (change to 0.5, 1.0, and 10) c = 10; q = 0; //concentration int cnctrn; cnctrn = 1000; srand((unsigned int)time(NULL)); for (d = 0; d < end; d++){ for (h = 0; h < 2; h++){ average1[d][h] = 0; average2[d][h] = 0; } } for (p = 0; p < end; p++){ for (d = 0; d < steps; d++){ width[p][d] = 0; } } for (p = 1; p < steps; p++){ width[0][p] = cnctrn; } //PLotting in Matlab FILE * pFile; char name [100]; pFile = fopen ("Gillespie.txt","w"); n = 0; d = 0; for (h = 0; h < steps; h++){ while (i < what && cnctrn > 1){q = double((rand())/(double(RAND_MAX + 1)));for (d = 0; d < end; d = d+1){ if ( i < (d+1)*measure && i >= d*measure){ width[d][h] = cnctrn; } } //exact data comparison w = cnctrn*c; M = -log(q)/w; cnctrn = cnctrn-1; i = i + M; n = n + 1; fprintf(pFile, "%f %i\n ", i, cnctrn); } } for (p = 1; p < end; p++){ for (d = 0; d < steps; d++){ if (width[p][d] == 0){ width[p][d] = width[p][d-1]; } } } fclose (pFile); for (d = 0; d < end; d++){ average1[d][0] = d*measure; average2[d][0] = d*measure; } for (d = 0; d < end; d++){ for (h = 0; h<steps; h++){average1[d][1] = average1[d][1] + double(width[d][h])/double(steps);average2[d][1]=average2[d][1]+double(width[d][h])*double(width[d][h])/double(steps);} } pFile = fopen ("average.txt","w"); for (d = 0; d < end; d++){ fprintf(pFile, "%f %f\n ", average1[d][0], average1[d][1]); } fclose (pFile); pFile = fopen ("averagesquared.txt","w"); for (d = 0; d < end; d++){ fprintf(pFile, "%f %f\n ", average2[d][0], average2[d][1]); } fclose (pFile); }

syntax error before 'double'

Putting (double) in parenthesis gets rid of the error, but outputs the wrong text files. How do I fix this error without just putting the (double) in parenthesis to get the correct output?

Any help with this would be very very appreciated! Thanks!