GCC compiler giving syntax error before 'double' error
On my Linux computer, I am using the command:
gcc programname.c -lm
for the following code:
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);
}
I keep getting this error for the lines I put in bold:
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!
how to fix 'integer overflow in expression' error
so I made those changes, putting (double) in parenthesis, but now I get the integer overflow error. how would i fix that? and the only way I am able to open my text files is by double clicking the a.out file that is created when I compile it, then the three text files appear. by the way, this is c code.
