hi,
im processing a binary file which contains 1,249,820 data points, and since the size of the file is 1,249,820 bytes, im assuming each data point uses 1 byte of memory. basically, im running through every point, and which ever point that is >= 50, i will set that point to 0 (each point runs from 0-255). so i hav written sth like
when i run it, however, the results are not wat i expect, ie the values which are >= 50 remain unchanged, many values <50 become 0, and basically values are randomly changed to 0 all over. can someone help?Code:#include <stdio.h> #include <stdlib.h> #include <math.h> int main() { FILE *fp3; fp3 = fopen("xxx\\b3", "rb"); FILE *fp3_o; fp3_o = fopen("xxx\\b3_o", "wb"); long int i, size = 1249820; char *b3_dn = malloc(size * sizeof(char)); fread(b3_dn, sizeof(char), size, fp3); for (i=0; i<size; i++){ if(b3_dn[i] >= 50) b3_dn[i] = 0; } fwrite(b3_dn, sizeof(char), size, fp3_o); free(b3_dn); return 0; }
btw, char takes 1 byte and int takes 4 byte on my system.
