how to read specific value from file in c - c

Question

if i have file contain students scores
for example this file
{
students scores :
100
90
83
70
}
how i can read just the values of scores with out reading "students scores :"???
mu code is already ok
but the problem in reading values
this is my code
#include <stdio.h>
int main (void)
{
FILE *infile;
double score, sum=0, average;
int count=0, input_status;
infile = fopen("scores.txt", "r");
input_status = fscanf(infile, "%lf", &score);
while (input_status != EOF)
{
printf("%.2f\n ", score);
sum += score;
count++;
input_status = fscanf(infile, "%lf", &score);
}
average = sum / count;
printf("\nSum of the scores is %f\n", sum);
printf("Average score is %.2f\n", average);
fclose(infile);
getch();
}

Answer 1

Problems I see:
input_status = fscanf(infile, "%lf", &score);
while (input_status != EOF)
is not right. The returned value of fscanf will be 0 if the read was not successful and 1 if it was successful.
More importantly, you need to add code that skips everything upto the point where you expect to see the numbers.
char line[100];
while ( fgets(line, 100, infile) != NULL )
{
// If the line containing "students scores :"
// is found, break from the while loop.
if (strstr(line, "students scores :") != NULL )
{
break;
}
}
Then, change start of the lines that read the data into:
input_status = fscanf(infile, "%lf", &score);
while (input_status == 1 )

Answer 2

Here's a fairly easy way to parse the file.
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
int main (void)
{
FILE *infile;
char lineBuf[255+1];
double score, sum=0, average;
int count=0;
int fieldsParsed;
infile = fopen("scores.txt", "r");
/** Read a line from the file. **/
while(fgets(lineBuf, sizeof(lineBuf), infile))
{
/** Is the first character of the line a digit? **/
if(!isdigit(*lineBuf))
continue; /* It is not a digit. Go get the next line. */
/** Convert the number string (in lineBuf) to an integer (score). **/
score=atof(lineBuf);
printf("fields[%d] %.2f\n ", fieldsParsed, score);
sum += score;
count++;
}
average = sum / count;
printf("\nSum of the scores is %f\n", sum);
printf("Average score is %.2f\n", average);
fclose(infile);
// getch(); Non-portable
return(0);
}

Answer 3

Use fseek() to skip past the leading bytes to the numbers.