C从一个文件读取数据并将计算结果存储在另一个文件中

Question

I'm a beginner to C language. Here I want to read data from file *fileptrIn and do some calculations, and store the answers in *fileptrOut. But I get a infinite loop with the first element in the file *fileptrIn. It prints only the first element in the file *fileptrIn repeatedly in the terminal. As I don't get any compilation errors, I'm unable to detect the error. Any suggestions to edit my code?

#include<stdio.h>

int main(void)
{
int value;
int total = 0;
int count = 0;

FILE *fileptrIn;

fileptrIn = fopen("input.txt", "r");

if(fileptrIn == NULL)
{
    printf("\nError opening for reading.\n");

    return -1;
}

printf("\nThe data:\n");

fscanf(fileptrIn, "%d", &value);

while(!feof(fileptrIn))
{
    printf("%d", value);

    total += value;

    ++count;
}

fclose(fileptrIn);

return 0;
}

Answer 1

while(!feof(fileptrIn))
{
    printf("%d", value);

    total += value;

    ++count;
}

You are not reading anything inside loop so the file pointer dont advance to reach EOF

Answer 2

In addition to the other answer, and continuing from my comment, you need to validate all input. You can accomplish this while removing the while (!feof(file)) problem as follows:

while (fscanf (fileptrIn, "%d", &value) == 1) {
    printf ("%d", value);
    total += value;
    ++count;
}