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C Programming - Input / Output

Exercise : Input / Output - Point Out Correct Statements
1.
Which of the following statement is correct about the program? 
#include<stdio.h>

int main()
{
    FILE *fp;
    char ch;
    int i=1;
    fp = fopen("myfile.c", "r");
    while((ch=getc(fp))!=EOF)
    {
        if(ch == '\n')
            i++;
    }
    fclose(fp);
    return 0;
}
The code counts number of characters in the file
The code counts number of words in the file
The code counts number of blank lines in the file
The code counts number of lines in the file
Answer: Option
Explanation:

This program counts the number of lines in the file myfile.c by counting the character '\n' in that file.

2.
Which of the following statement is correct about the program? 
#include<stdio.h>

int main()
{
    FILE *fp;
    char str[11], ch;
    int i=0;
    fp = fopen("INPUT.TXT", "r");
    while((ch=getc(fp))!=EOF)
    {
        if(ch == '\n' || ch == ' ')
        {
            str[i]='\0';
            strrev(str);
            printf("%s", str);
            i=0;
        }
        else
            str[i++]=ch;
    }
    fclose(fp);
    return 0;
}
The code writes a text to a file
The code reads a text files and display its content in reverse order
The code writes a text to a file in reverse order
None of above
Answer: Option
Explanation:

This program reads the file INPUT.TXT and store it in the string str after reversing the string using strrev function.

3.
Point out the correct statements about the program? 
#include<stdio.h>

int main()
{
    FILE *fptr;
    char str[80];
    fptr = fopen("f1.dat", "w");
    if(fptr == NULL)
        printf("Cannot open file");
    else
    {
        while(strlen(gets(str))>0)
        {
            fputs(str, fptr);
            fputs("\n", fptr);
        }
        fclose(fptr);
    }
    return 0;
}
The code copies the content of one file to another
The code writes strings that are read from the keyboard into a file.
The code reads a file
None of above
Answer: Option
Explanation:

This program get the input string from the user through gets function and store it in the file f1.txt using fputs function.

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