I am new to the C/C++
My Program:
int main(int argc, _TCHAR* argv[])
{
//Declarations
FILE *fp;
char line[1000];
char *CheckPoint[3000];
//Opening a file and reading
fp = fopen("C:\\conf ig.txt","rt");
while(fgets(lin e, 1000, fp) != NULL)
{
char datatext[1000];
sscanf (line, "%s", &datatext);
printf ("%s\n", datatext);
CheckPoint[i] = datatext;
}
//Closing File
fclose(fp);
return 0;
}
//Config.txt Data
10
20
30
40
My Question:
I am able to read the data from the file from the above loop of reading the file
but when i add it to the array the value incrementing the array and assiging it, the values gets changed
first time from the txt file i get 10 and i add to CheckPoint[i] = datatext; where initially i =0, the next loop when the value for the datatext = 20 the initial value get to 20 and also inserts 20 in the second place
Where am i going wrong
Please help me
2 2434
HI..
i think you didnt declare variable names i ?, and if you declare it and just you didnt post it within your code, you didnt increase it within loop
Best Regards
There's a bigger bug here that just not declaring i.
There's this:
char datatext[1000];
sscanf (line, "%s", &datatext);
printf ("%s\n", datatext);
CheckPoint[i] = datatext;
Here CheckPoint[i] is assgined the address of the datatext array. As a result, every CheckPoint[i] will point to the same datatext array making the CheckPoint array elements to all be the same.
You need to a) find the length of the string in datatext, b) add 1 more for a null terminator, c) allocate memory for that length+1 and out that address in CheckPoint[i], d) copy datatext to the CheckPoint[i] array, e) write a loop at the nd of the program to delete all of the allocations made in the CheckPoint array.
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