C Programming - Input / Output

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Exercise

"Example is better than precept."

- (Proverb)

Which files will get closed through the fclose() in the following program?

#include<stdio.h>

int main()
{
    FILE *fs, *ft, *fp;
    fp = fopen("A.C", "r");
    fs = fopen("B.C", "r");
    ft = fopen("C.C", "r");
    fclose(fp, fs, ft);
    return 0;
}

A.	"A.C" "B.C" "C.C"	B.	"B.C" "C.C"
C.	"A.C"	D.	Error in fclose()

On executing the below program what will be the contents of 'target.txt' file if the source file contains a line "To err is human"?

#include<stdio.h>

int main()
{
    int i, fss;
    char ch, source[20] = "source.txt", target[20]="target.txt", t;
    FILE *fs, *ft;
    fs = fopen(source, "r");
    ft = fopen(target, "w");
    while(1)
    {
        ch=getc(fs);
        if(ch==EOF)
            break;
        else
        {
            fseek(fs, 4L, SEEK_CUR);
            fputc(ch, ft);
        }
    }
    return 0;
}

A.	r n	B.	Trh
C.	err	D.	None of above

To scan a and b given below, which of the following scanf() statement will you use?

#include<stdio.h>

float a;
double b;

A.	scanf("%f %f", &a, &b);	B.	scanf("%Lf %Lf", &a, &b);
C.	scanf("%f %Lf", &a, &b);	D.	scanf("%f %lf", &a, &b);

Out of fgets() and gets() which function is safe to use?

gets()

fgets()

10.

Consider the following program and what will be content of t?

#include<stdio.h>

int main()
{
    FILE *fp;
    int t;
    fp = fopen("DUMMY.C", "w");
    t = fileno(fp);
    printf("%d\n", t);
    return 0;
}

A.	size of "DUMMY.C" file
B.	The handle associated with "DUMMY.C" file
C.	Garbage value
D.	Error in fileno()