Simple program help

[Zata]

Hi, guys I just cannot solve this little problem

I have this text file:
4
a += 2
b -= 5
a += 4
b += a

How do I solve these equations in C language?

I would like to get this:
a += 2 : 2
b -= 5 : -5
a += 4 : 6
b += a : 1
a = 6
b = 1

Here is my code so far, I tried to do something and it seems everything was read, but I just cannot do anything with it
./this -f filename

 #include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
int main(int argc, char* argv[]) {
 
  char loadfile[32] = "text.txt";
 
  unsigned long i;
 
 if (argc == 3) { strcpy(loadfile, argv[2]); }
 
 FILE *file;
 file = fopen(loadfile, "r");
 if (file == NULL) { printf("ERROR LOADING FILE"); }
 
 if (fseek(file, 0, SEEK_END)) { printf("ERROR FILE SIZE"); }
 unsigned long filesize = ftell(file);
 fseek(file, 0, SEEK_SET);
 
 char* init = malloc(filesize * sizeof(char));
 if (init == NULL) { printf("ALLOC ERROR"); }
 int equations_counter;
 fscanf(file,"%i", &equations_counter);
 unsigned int items = 0;
 
 for (i = 0 ; i < filesize ; i++) {
     init[i] = fgetc(file);
   if (init[i] == '\n') { items++; }
  }
 fclose(file);
 
  char *LeftSide[items];
  char *operation[items];
  char *RightSide[items];
 
  LeftSide[0] = strtok (init," ");
  operation[0] = strtok (NULL," ");
  RightSide[0] = strtok (NULL," \n");
 
 for (i = 1 ; i < items-1 ; i++) {
    LeftSide[i] = strtok (NULL," ");
    operation[i] = strtok (NULL," ");
    RightSide[i] = strtok (NULL," \n");
  }
 /**for (i = 0 ; i < items-1 ; i++) {
   printf ("%s ",LeftSide[i]);
   printf ("%s ",operation[i]);
   printf ("%s\n",RightSide[i]);
  }*/
 
 char check[3];
 char plus[3] = "+=";
 char minus[3] = "-=";
 char LSa,PSa;
 char op;
  //printf ("%s\n",plus);
  //printf ("%s\n",minus);
 
 for (i = 0; i < items-1 ; i++) {
 LSa = strtok (init," ");
 op = strtok (NULL," ");
 PSa = strtok (NULL," \n");
   //printf ("%s ",operation[i]);
 if ( op == plus ) {
   printf ("%s ",operation[i]);
 }
 else if ( op == minus ) {
   printf ("%s ",operation[i]);
 }
 else printf ("ERROR\n");
 }
} 
  

[Rubberman]

The terms of use on this forum preclude us from doing your school work for you. Please don't ask us to. We can only help point you in the right direction at most. That is why you are in school, to learn by doing.

That said, I can only ask where have you initialized your variables? Remember that in the C language, just declaring a variable does not set a value. It contains whatever was in memory there before. Ie,

int a, b, c;   /* These are not initialized so the following will generate unknown results */

a += 2;
b -= 5;
c += a;

However, if you initialize the variables to 0, a known value, then your results will make sense. Ie,

int a = 0, b = 0, c = 0;
a += 2;
b -= 5;
c += a;