adding using file integers input - c

Question

so i got the whole setup for my program and i was able to read the whole file content. the only one thing i need is to be able to add each column and put it in the variables i made. first column is miles second is gallons. so how can i make it possible using my code.
54 250 19
62 525 38
71 123 6
85 1322 86
97 235 14
#include <stdio.h>
#include <conio.h>
int main()
{
// pointer file
FILE *pFile;
char line[128];
int miles;
int gallons;
int mpg;
// opening name of file with mode
pFile = fopen("Carpgm.txt","r");
//headers
printf("Car No. Miles Driven Gallons Used\n");
//checking if file is real and got right path
if (pFile != NULL)
{
while (fgets(line, sizeof(line), pFile) != NULL)
{
int a, b, c;
if (sscanf(line, "%d %d %d", &a, &b, &c) == 3)
{
/* Values read */
printf("%d %d %d\n",a, b, c);
}
}
mpg = miles / gallons;
printf("Total miles driven: \n",miles);
printf("Total Gallons of gas: \n",gallons);
printf("Average MPG: \n",mpg);
printf("%d",a);
//closing file
fclose(pFile);
}
else
{
printf("Could not open file\n");
}
getch();
return 0;
}

Answer 1

That depends what you want to do.
If you just want to add values, you can do something like:
...
int miles = 0;
int gallons = 0;
...
/* Values read */
miles += b;
gallons += c;
...
Note that you can't print a like you did before closing the file as a is defined only in the while loop.
Furthermore, your printf statements won't work as expected, you forgot to specify the format %d, do:
printf("Total miles driven: %d\n",miles);
printf("Total Gallons of gas: %d\n",gallons);
printf("Average MPG: %d\n",mpg);