hi plz help me in this topic

Code:

 
#include<stdio.h>
void main()
{
char temp[10];
FILE *input1 = NULL;
FILE *input2 = NULL;
unsigned char buffer[100], lTempData[7][20];
char *lPtr = NULL;
int i =0;
input1 = fopen("/u/n073313/vijay/File.txt", "rb");

fread(buffer, 1,100, input1);
{
printf("First line %s\n",buffer);
lPtr = strtok(buffer, ",");

strncpy(lTempData[i], lPtr, strlen(lPtr));

while (lPtr != NULL)
{
i++;
strncpy(lTempData[i], lPtr, strlen(lPtr));
}

for (int j =0; j< 7 ; j++)
printf("Values %s\n", lTempData[i]);

int a = atol(lTempData[5]);
int b = atol(lTempData[6]);

int c = a+b;

printf("Values %d %d result %d\n", a, b, c);
sprintf(temp, "%d", c);
input2 = fopen("File2.txt", "r");
fwrite(c, 1, 10, input2);
fclose(input1);
fclose(input2);

}

}

The i/p txt file is like this
939,MUM,ord,396,2,3.0,4.0
100,bom,nru,1009,10,4.0,6.0

and i want to add 3.0+4.0=7.0
i.e
First i want to read the txt file add last two columns writing it into another txt I written the code and i run the code i am getting
------------------------------------
939,MUM,ord,396,2,3.0,4.0
100,bom,nru,1009,10,4.0,6.0

Segmentation fault(coredump)
----------------------------------------------

please help me in this

Thanks & regards
vijay

Asked already, only 8 minutes earlier.
hi i am new plz help me

Patience is also a virtue of a programmer.