Question

Write a program which populates an array with integer values read from a file. We do not know how many integers are in the file, so you must loop until the end of the file is reached. For this problem, you may NOT use the function feof(). Instead, use the result returned from fscanf() to determine the end-of-file. Recall, we can set the result of fscanf() to an integer variable, and check to see if the integer variable is equal to the EOF marker. The program must take the items in the array and reverse them. You may use one array only to solve this problem.

Answer 1

Answer:

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

int main()

{

int arr[100];

int i = 0;

int j = 0;

char c[10];

char temp;

int sum = 0;

FILE* fp;

if ((fp = fopen("test.txt", "r")) == NULL) {

printf("cannot open the file");

return;

}

else {

do {

temp = fgetc(fp);

if (temp == ' ' || temp == '\n') {

c[j] = '\0';

arr[i++] = atoi(c);

j = 0;

continue;

}

c[j++] = temp;

} while (temp != EOF);

for (j = i - 1; j >= 0; j--) {

printf("%d\n", arr[j]);

}

}

getchar();

}

Explanation: