5.2 Examples

Sample Code 01 (File IO)

#include <stdio.h>
#include <stdlib.h>

#define BUFFER_SIZE 100

void q2() {

    FILE* fp = fopen("input.txt", "r");
    char zDesc[BUFFER_SIZE];
    char zMonth[4];
    int date, hour, minute, seconds;
    char zProcessName[51];
    int nRead;

    if (fp == NULL) {
        perror("File could not be opened!");
    }
    else {

        do {
            nRead = fscanf(fp, "%3s %d %d:%d:%d %50s",
                        zMonth, &date, &hour, &minute, &seconds, zProcessName);
            fgets(zDesc, BUFFER_SIZE, fp);

            if (nRead != EOF) {
                printf("Detials: %s %d %d:%d:%d %s\n", zMonth, date, hour, minute, seconds, zProcessName);
                printf("Desciption: %s", zDesc);
            }

        } while (nRead != EOF);

        fclose(fp);
    }

}


void print(int* pArr, int len) {

    int i;
    printf("Printing the Array:\n");
    for (i = 0 ; i < len ; i++) {
        printf("%d-", pArr[i]);
    }
    printf("\n");
}


void q3() {

    FILE* fp = fopen("input2.txt", "r");
    int nRead;
    int len;
    int* pArr;
    int i = 0;

    if (fp == NULL) {
        perror("File could not be opened!");
    }
    else {

        fscanf(fp, "%d", &len);
        pArr = malloc(sizeof(int) * len);

        do {
            nRead = fscanf(fp, "%d", &(pArr[i]));
            i++;

        } while (i < len && nRead != EOF);

        print(pArr, len);

        free(pArr);
        fclose(fp);
    }
}

int main() {

    q3();

    return 0;
}

Input File (input.txt)

Aug 20 10:20:57 kernel: ata3: SATA link down
Aug 21 10:20:57 kernel2: ata3: SATA link down
Aug 22 10:20:57 kernel3: ata3: SATA link down

Input File (input2.txt)

5
10 20 40 50 60