parsing - C pass by reference "returns" incorrect content -

i want read values file using function , pass them main. file has specific format:

string double char

for example 2 lines:

blahblah 0.12 g
testtesttest 0.33 e

i have following program. although values printed correctly in function, in main few of them printed. rest 0.00000 , no character printed well. doing wrong?

#include<stdio.h> #include<stdlib.h> #include<string.h>  int read_file(const char *filename, double **prob, char **sense);  int main(){      double *iprob;     char *sense;      read_file("test.txt", &iprob, &sense);      printf("main: %lf %c\n", iprob[0], sense[0]);      return 0; }   int read_file(const char *filename, double **prob, char **sense){      file *fp;     char line[100], temp[80];     int = 0;      fp = fopen(filename, "r");     if (fp == null){         fprintf(stderr,"file %s not found!\n", filename);         return 0;     }      //*prob = (double *)malloc(sizeof(double) * 100);     //*sense = (char *)malloc(sizeof(char) * 100);      while( fgets(line, 100, fp) != null){          prob[i] = (double *)malloc(sizeof(double));         sense[i] =  (char *)malloc(sizeof(char));          if ( sscanf(line, "%s %lf %c", temp, prob[i], sense[i]) < 3 ){              fprintf(stderr, "parsing error detected @ line %d!", i);             fclose(fp);             return 0;         }         else{              printf("%lf %c\n", *prob[i], *sense[i]);         }         i++;     }     fclose(fp);     return 1; } 

you use double pointer double in functions, because want update pointer passed in main.

the problem is, allocated array in *prob, , therefore have address elements of array (*prob)[i].

*prob[i] same *(prob[i]). prob pointer pointer; has 1 element, speak, index except 0 invalid here.

below correction of code:

• it reads in many entries there in file reallocating memory needed.
• it returns -1 on failure , number of items when successful, know how many items can safely address.
• you should free both pointers after use.

so:

#include <stdio.h> #include <stdlib.h> #include <string.h>  int read_file(const char *filename, double **prob, char **sense);  int main(){      double *iprob = null;     char *sense = null;     int i, n;      n = read_file("test.txt", &iprob, &sense);      (i = 0; < n; i++) {         printf("main: %lf %c\n", iprob[i], sense[i]);     }      free(iprob);     free(sense);      return 0; }  int read_file(const char *filename, double **prob, char **sense){      file *fp;     char line[100];     int size = 0;     int = 0;      *prob = null;     *sense = null;      fp = fopen(filename, "r");     if (fp == null) return -1;      while (fgets(line, sizeof(line), fp) != null) {         char temp[80];          if (i >= size) {             size += 8;              *prob = realloc(*prob, size * sizeof(**prob));             *sense = realloc(*sense, size * sizeof(**sense));              if (*prob == null || *sense == null) {                 fclose(fp);                 return -1;             }         }          if (sscanf(line, "%79s %lf %c", temp, &(*prob)[i], &(*sense)[i]) < 3) {             fprintf(stderr, "parsing error detected @ line %d!", i);             fclose(fp);             return -1;         }           printf("%lf %c\n", (*prob)[i], (*sense)[i]);         i++;     }     fclose(fp);      return i; }